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diff --git a/monitoring-web/Cargo.toml b/monitoring-web/Cargo.toml
new file mode 100644
index 00000000..87beabf5
--- /dev/null
+++ b/monitoring-web/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "market-monitor"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+axum = "0.8"
+tokio = { version = "1", features = ["full"] }
+askama = "0.12"
+askama_axum = "0.4"
+rusqlite = { version = "0.32", features = ["bundled"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tower-http = { version = "0.6", features = ["fs"] }
+tracing = "0.1"
+tracing-subscriber = "0.3"
+chrono = "0.4"
diff --git a/monitoring-web/src/db.rs b/monitoring-web/src/db.rs
new file mode 100644
index 00000000..92f7db3b
--- /dev/null
+++ b/monitoring-web/src/db.rs
@@ -0,0 +1,37 @@
+use rusqlite::Connection;
+
+#[derive(Debug, Clone)]
+pub struct ObsRow {
+    pub temp_c: Option<f64>,
+    #[allow(dead_code)]
+    pub obs_time: Option<String>,
+}
+
+/// Get recent temperature observations for an ICAO station.
+pub fn get_recent_obs(db_path: &str, icao: &str, minutes: i32, limit: usize) -> Vec<ObsRow> {
+    let conn = match Connection::open(db_path) {
+        Ok(c) => c,
+        Err(_) => return vec![],
+    };
+    let sql = format!(
+        "SELECT temp_c, obs_time FROM airport_obs_log \
+         WHERE icao = ?1 AND created_at > datetime('now', '{} minutes') \
+         ORDER BY created_at DESC LIMIT ?2",
+        -minutes
+    );
+    let mut stmt = match conn.prepare(&sql) {
+        Ok(s) => s,
+        Err(_) => return vec![],
+    };
+    let rows = stmt
+        .query_map(rusqlite::params![icao.to_uppercase(), limit as i64], |row| {
+            Ok(ObsRow {
+                temp_c: row.get(0)?,
+                obs_time: row.get(1)?,
+            })
+        })
+        .ok()
+        .map(|iter| iter.filter_map(|r| r.ok()).collect())
+        .unwrap_or_default();
+    rows
+}
diff --git a/monitoring-web/src/main.rs b/monitoring-web/src/main.rs
new file mode 100644
index 00000000..886914e3
--- /dev/null
+++ b/monitoring-web/src/main.rs
@@ -0,0 +1,153 @@
+mod db;
+mod model;
+mod trend;
+
+use std::sync::Arc;
+
+use askama_axum::Template;
+use axum::{
+    extract::State,
+    response::{Html, IntoResponse},
+    routing::get,
+    Router,
+};
+use chrono::Utc;
+use model::CitySnapshot;
+use tower_http::services::ServeDir;
+use tracing_subscriber;
+
+// ── city config ──
+// (city_key, display_name, icao, airport_en, utc_offset_hours, threshold)
+const CITIES: &[(&str, &str, &str, &str, i32, f64)] = &[
+    ("seoul", "首尔", "RKSI", "Incheon", 9, 3.0),
+    ("busan", "釜山", "RKPK", "Gimhae", 9, 2.0),
+    ("tokyo", "东京", "44166", "Haneda", 9, 2.0),
+    ("ankara", "安卡拉", "17128", "Esenboğa", 3, 3.0),
+    ("helsinki", "赫尔辛基", "EFHK", "Vantaa", 3, 2.0),
+    ("amsterdam","阿姆斯特丹","EHAM","Schiphol",2,2.0),
+    ("istanbul","伊斯坦布尔","17058","Airport",3,3.0),
+    ("paris", "巴黎", "LFPB", "Le Bourget", 2, 3.0),
+    ("hong kong","香港","HKO","Observatory",8,1.5),
+    ("lau fau shan","流浮山","LFS","Lau Fau Shan",8,1.5),
+    ("taipei", "台北", "466920", "Songshan", 8, 1.5),
+];
+
+// ── app state ──
+struct AppState {
+    db_path: String,
+}
+
+// ── templates ──
+
+#[derive(Template)]
+#[template(path = "monitor.html")]
+struct MonitorTemplate {
+    cities: Vec<CitySnapshot>,
+    full_page: bool,
+    generated_at: String,
+}
+
+// ── data loading ──
+
+fn load_city_snapshot(db_path: &str, (key, display, icao, airport, tz, thresh): &(&str, &str, &str, &str, i32, f64)) -> CitySnapshot {
+    let now_utc = Utc::now();
+    let local = now_utc + chrono::Duration::hours(*tz as i64);
+    let local_time = local.format("%H:%M").to_string();
+
+    // Recent obs for temp + trend
+    let obs = db::get_recent_obs(db_path, icao, 120, 12);
+    let temps: Vec<f64> = obs.iter().filter_map(|o| o.temp_c).collect();
+    let current_temp = temps.first().copied();
+
+    // Trend from last 6 points
+    let trend_data: Vec<f64> = temps.iter().take(6).copied().collect();
+    let trend = trend::calc_trend(&trend_data);
+
+    // Today's max: max of all temps in recent window (approximation)
+    let today_max = temps.iter().cloned().fold(None::<f64>, |a, b| {
+        Some(a.map_or(b, |x| x.max(b)))
+    });
+    let new_high = match (current_temp, today_max) {
+        (Some(ct), Some(tm)) => ct >= tm + 0.3,
+        _ => false,
+    };
+
+    // For AMOS cities, we'd need runway data from a different DB table.
+    // Simplified: no runway pairs for now; can be added later.
+    let runway_pairs: Vec<(String, f64)> = vec![];
+
+    CitySnapshot {
+        name: key.to_string(),
+        display_name: display.to_string(),
+        airport: airport.to_string(),
+        icao: icao.to_string(),
+        local_time,
+        current_temp,
+        today_max,
+        max_time: None,
+        trend,
+        new_high,
+        runway_pairs,
+        gap: None,
+        threshold: *thresh,
+        time_ok: false,
+        temp_ok: false,
+        trend_ok: false,
+        in_window: false,
+    }
+}
+
+fn load_all_cities(db_path: &str) -> Vec<CitySnapshot> {
+    CITIES
+        .iter()
+        .map(|c| load_city_snapshot(db_path, c))
+        .collect()
+}
+
+// ── routes ──
+
+async fn index(State(state): State<Arc<AppState>>) -> impl IntoResponse {
+    let cities = load_all_cities(&state.db_path);
+    let tmpl = MonitorTemplate {
+        cities,
+        full_page: true,
+        generated_at: Utc::now().format("%H:%M:%S UTC").to_string(),
+    };
+    Html(tmpl.render().unwrap_or_else(|e| format!("Template error: {e}")))
+}
+
+async fn api_data(State(state): State<Arc<AppState>>) -> impl IntoResponse {
+    let cities = load_all_cities(&state.db_path);
+    let tmpl = MonitorTemplate {
+        cities,
+        full_page: false,
+        generated_at: Utc::now().format("%H:%M:%S UTC").to_string(),
+    };
+    Html(tmpl.render().unwrap_or_else(|e| format!("Template error: {e}")))
+}
+
+// ── main ──
+
+#[tokio::main]
+async fn main() {
+    tracing_subscriber::fmt::init();
+
+    let db_path = std::env::var("POLYWEATHER_DB_PATH")
+        .unwrap_or_else(|_| "/var/lib/polyweather/polyweather.db".into());
+    let listen = std::env::var("MONITOR_LISTEN_ADDR")
+        .unwrap_or_else(|_| "0.0.0.0:3001".into());
+
+    tracing::info!("DB path: {db_path}");
+    tracing::info!("市场监控页面: http://{listen}");
+
+    let state = Arc::new(AppState { db_path });
+
+    let app = Router::new()
+        .route("/", get(index))
+        .route("/api/data", get(api_data))
+        .nest_service("/static", ServeDir::new("static"))
+        .with_state(state);
+
+    let listener = tokio::net::TcpListener::bind(&listen).await.unwrap();
+    axum::serve(listener, app).await.unwrap();
+}
diff --git a/monitoring-web/src/model.rs b/monitoring-web/src/model.rs
new file mode 100644
index 00000000..6d9df98d
--- /dev/null
+++ b/monitoring-web/src/model.rs
@@ -0,0 +1,51 @@
+use serde::Serialize;
+
+#[derive(Debug, Clone, Serialize)]
+pub struct CitySnapshot {
+    pub name: String,
+    pub display_name: String,
+    pub airport: String,
+    pub icao: String,
+    pub local_time: String,
+    pub current_temp: Option<f64>,
+    pub today_max: Option<f64>,
+    pub max_time: Option<String>,
+    pub trend: Trend,
+    pub new_high: bool,
+    pub runway_pairs: Vec<(String, f64)>,
+    pub gap: Option<f64>,
+    pub threshold: f64,
+    pub time_ok: bool,
+    pub temp_ok: bool,
+    pub trend_ok: bool,
+    pub in_window: bool,
+}
+
+#[derive(Debug, Clone, Copy, Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Trend {
+    Rising,
+    Falling,
+    Flat,
+    Unknown,
+}
+
+impl Trend {
+    pub fn symbol(&self) -> &str {
+        match self {
+            Trend::Rising => "↑",
+            Trend::Falling => "↓",
+            Trend::Flat => "→",
+            Trend::Unknown => "",
+        }
+    }
+
+    pub fn css_class(&self) -> &str {
+        match self {
+            Trend::Rising => "rising",
+            Trend::Falling => "falling",
+            Trend::Flat => "flat",
+            Trend::Unknown => "",
+        }
+    }
+}
diff --git a/monitoring-web/src/trend.rs b/monitoring-web/src/trend.rs
new file mode 100644
index 00000000..d2e51925
--- /dev/null
+++ b/monitoring-web/src/trend.rs
@@ -0,0 +1,36 @@
+use crate::model::Trend;
+
+/// Calculate temperature trend from recent observations.
+/// Uses linear regression slope. Observations are newest-first.
+pub fn calc_trend(temps: &[f64]) -> Trend {
+    let n = temps.len();
+    if n < 4 {
+        return Trend::Unknown;
+    }
+    // Reverse to oldest-first for regression
+    let values: Vec<f64> = temps.iter().rev().copied().collect();
+    let n_f = n as f64;
+    let mean_x = (n_f - 1.0) / 2.0;
+    let mean_y = values.iter().sum::<f64>() / n_f;
+
+    let mut num = 0.0;
+    let mut den = 0.0;
+    for (i, &y) in values.iter().enumerate() {
+        let x = i as f64;
+        num += (x - mean_x) * (y - mean_y);
+        den += (x - mean_x) * (x - mean_x);
+    }
+    if den == 0.0 {
+        return Trend::Flat;
+    }
+    let slope = num / den;
+    // Slope is °C per observation interval (~10 min per obs from METAR cluster)
+    // Threshold: > +0.2 → rising, < -0.2 → falling
+    if slope > 0.2 {
+        Trend::Rising
+    } else if slope < -0.2 {
+        Trend::Falling
+    } else {
+        Trend::Flat
+    }
+}
diff --git a/monitoring-web/static/style.css b/monitoring-web/static/style.css
new file mode 100644
index 00000000..465d5896
--- /dev/null
+++ b/monitoring-web/static/style.css
@@ -0,0 +1,184 @@
+* { margin:0; padding:0; box-sizing:border-box; }
+
+body {
+  background: #0f1117;
+  color: #c8cdd4;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+  min-height: 100vh;
+}
+
+.page {
+  max-width: 1400px;
+  margin: 0 auto;
+  padding: 20px 24px;
+}
+
+.header {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  margin-bottom: 24px;
+  padding-bottom: 12px;
+  border-bottom: 1px solid #1e2130;
+}
+
+.header h1 {
+  font-size: 22px;
+  font-weight: 600;
+  color: #e8eaed;
+  letter-spacing: 0.02em;
+}
+
+.updated {
+  font-size: 13px;
+  color: #5a6170;
+}
+
+/* ── grid ── */
+.card-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 14px;
+}
+
+@media (max-width: 1280px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
+@media (max-width: 900px)  { .card-grid { grid-template-columns: repeat(2, 1fr); } }
+@media (max-width: 560px)  { .card-grid { grid-template-columns: 1fr; } }
+
+/* ── card ── */
+.card {
+  background: #161822;
+  border: 1px solid #1e2130;
+  border-radius: 10px;
+  padding: 16px 18px;
+  transition: border-color 0.3s, box-shadow 0.3s;
+  position: relative;
+}
+
+.card:hover {
+  border-color: #2a2e40;
+}
+
+/* ── card-top ── */
+.card-top {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  margin-bottom: 10px;
+  font-size: 13px;
+  flex-wrap: wrap;
+}
+
+.city-name {
+  color: #e0e3e8;
+  font-weight: 600;
+}
+
+.airport {
+  color: #6a7180;
+}
+
+.local-time {
+  margin-left: auto;
+  color: #4a5160;
+  font-variant-numeric: tabular-nums;
+}
+
+.badge {
+  font-size: 11px;
+  padding: 1px 6px;
+  border-radius: 4px;
+  font-weight: 600;
+}
+
+.new-high {
+  background: rgba(124, 58, 237, 0.18);
+  color: #a78bfa;
+}
+
+/* ── temp ── */
+.card-temp {
+  margin: 4px 0 6px;
+  font-weight: 700;
+  line-height: 1.1;
+}
+
+.temp-value {
+  font-size: 40px;
+  color: #e8eaed;
+  letter-spacing: -0.02em;
+}
+
+.temp-value.na {
+  color: #3a4050;
+  font-size: 28px;
+}
+
+.temp-unit {
+  font-size: 18px;
+  color: #5a6170;
+  margin-left: 2px;
+}
+
+/* ── meta ── */
+.card-meta {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  margin-bottom: 4px;
+}
+
+.meta-row {
+  display: flex;
+  justify-content: space-between;
+  font-size: 13px;
+}
+
+.meta-row .label {
+  color: #4a5160;
+}
+
+.meta-row .value {
+  color: #9aa0b0;
+  font-variant-numeric: tabular-nums;
+}
+
+.meta-row .value.na {
+  color: #3a4050;
+}
+
+/* ── trend ── */
+.trend { font-size: 15px; font-weight: 600; }
+.trend.rising { color: #34d399; }
+.trend.falling { color: #60a5fa; }
+.trend.flat { color: #5a6170; }
+
+/* ── runway ── */
+.card-runway { margin-top: 8px; }
+
+.runway-divider {
+  height: 1px;
+  background: #1e2130;
+  margin-bottom: 6px;
+}
+
+.runway-row {
+  display: flex;
+  justify-content: space-between;
+  font-size: 12px;
+  margin-bottom: 1px;
+}
+
+.runway-label { color: #4a5160; }
+.runway-temp { color: #7a8290; font-variant-numeric: tabular-nums; }
+
+/* ── HTMX indicator ── */
+.htmx-indicator {
+  text-align: center;
+  padding: 12px;
+  font-size: 13px;
+  color: #3a4050;
+  display: none;
+}
+.htmx-request .htmx-indicator,
+.htmx-request.htmx-indicator { display: block; }
diff --git a/monitoring-web/templates/monitor.html b/monitoring-web/templates/monitor.html
new file mode 100644
index 00000000..4cfafedc
--- /dev/null
+++ b/monitoring-web/templates/monitor.html
@@ -0,0 +1,79 @@
+{% if full_page %}
+<!DOCTYPE html>
+<html lang="zh">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<title>市场监控 — PolyWeather</title>
+<link rel="stylesheet" href="/static/style.css">
+<meta http-equiv="refresh" content="120">
+</head>
+<body>
+<div class="page">
+<header class="header">
+  <h1>🔥 市场监控</h1>
+  <span class="updated">更新 {{ generated_at }}</span>
+</header>
+{% endif %}
+
+<div id="card-grid" class="card-grid"
+     hx-get="/api/data" hx-trigger="every 60s" hx-swap="outerHTML" hx-indicator="#spinner">
+{% for c in cities %}
+<div class="card">
+  <div class="card-top">
+    <span class="city-name">{{ c.display_name }}</span>
+    <span class="airport">/ {{ c.airport }}</span>
+    <span class="local-time">{{ c.local_time }}</span>
+    {% if c.new_high %}
+    <span class="badge new-high">◆新高</span>
+    {% endif %}
+  </div>
+
+  <div class="card-temp">
+    {% match c.current_temp %}
+    {% when Some with (t) %}
+    <span class="temp-value">{{ "{:.1}"|format(t) }}</span><span class="temp-unit">°C</span>
+    {% when None %}
+    <span class="temp-value na">--</span>
+    {% endmatch %}
+  </div>
+
+  <div class="card-meta">
+    <div class="meta-row">
+      <span class="label">今日最高</span>
+      {% match c.today_max %}
+      {% when Some with (m) %}
+      <span class="value">{{ "{:.1}"|format(m) }}°C</span>
+      {% when None %}
+      <span class="value na">--</span>
+      {% endmatch %}
+    </div>
+    <div class="meta-row">
+      <span class="label">趋势</span>
+      <span class="value trend {{ c.trend.css_class() }}">{{ c.trend.symbol() }}</span>
+    </div>
+  </div>
+
+  {% if !c.runway_pairs.is_empty() %}
+  <div class="card-runway">
+    <div class="runway-divider"></div>
+    {% for (pair, temp) in c.runway_pairs %}
+    <div class="runway-row">
+      <span class="runway-label">{{ pair }}</span>
+      <span class="runway-temp">{{ "{:.1}"|format(temp) }}°C</span>
+    </div>
+    {% endfor %}
+  </div>
+  {% endif %}
+</div>
+{% endfor %}
+</div>
+
+<div id="spinner" class="htmx-indicator">刷新中…</div>
+
+{% if full_page %}
+<script src="https://unpkg.com/htmx.org@2.0.4"></script>
+</div>
+</body>
+</html>
+{% endif %}