diff --git a/frontend/components/dashboard/scan-terminal/__tests__/temperatureDefaultVisibilityPolicy.test.ts b/frontend/components/dashboard/scan-terminal/__tests__/temperatureDefaultVisibilityPolicy.test.ts
index 1335c627..fba50346 100644
--- a/frontend/components/dashboard/scan-terminal/__tests__/temperatureDefaultVisibilityPolicy.test.ts
+++ b/frontend/components/dashboard/scan-terminal/__tests__/temperatureDefaultVisibilityPolicy.test.ts
@@ -161,6 +161,56 @@ export function runTests() {
     "DEB peak auto window should not expand beyond 12 hours",
   );
 
+  const postPeakWindowChart = __buildTemperatureChartDataForTest(
+    {
+      city: "beijing",
+      local_date: "2026-05-26",
+      local_time: "21:10",
+      tz_offset_seconds: 8 * 60 * 60,
+      deb_prediction: 35,
+      runway_plate_history: {
+        "19/01": [
+          { time: "2026-05-26T10:00:00+08:00", temp: 29.8 },
+          { time: "2026-05-26T15:00:00+08:00", temp: 34.9 },
+          { time: "2026-05-26T21:00:00+08:00", temp: 28.6 },
+        ],
+      },
+    } as any,
+    {
+      localTime: "21:10",
+      times: [
+        "00:00", "01:00", "02:00", "03:00", "04:00", "05:00",
+        "06:00", "07:00", "08:00", "09:00", "10:00", "11:00",
+        "12:00", "13:00", "14:00", "15:00", "16:00", "17:00",
+        "18:00", "19:00", "20:00", "21:00", "22:00", "23:00",
+      ],
+      temps: [
+        20, 20.5, 21, 21.5, 22, 23,
+        24, 25, 26, 27, 29, 31,
+        32, 33, 34.2, 35, 34.4, 33.3,
+        31.8, 30.2, 28.5, 27, 25.5, 24,
+      ],
+      debPrediction: 35,
+    } as any,
+    "1D",
+  );
+  const postPeakWindowRange = __getDebPeakWindowRangeForTest(
+    postPeakWindowChart.data,
+    postPeakWindowChart.series as any,
+  );
+  assert(postPeakWindowRange, "post-peak default chart view should still derive from the DEB peak window");
+  const postPeakWindowRows = postPeakWindowChart.data.slice(postPeakWindowRange![0], postPeakWindowRange![1] + 1);
+  const postPeakWindowStart = postPeakWindowRows[0].ts;
+  const postPeakWindowEnd = postPeakWindowRows[postPeakWindowRows.length - 1].ts;
+  assert(
+    postPeakWindowEnd >= Date.UTC(2026, 4, 26, 21, 0, 0),
+    "After the peak window, default high-temperature view should extend to the latest live observation",
+  );
+  assert(
+    postPeakWindowEnd - postPeakWindowStart <= 12 * 60 * 60 * 1000,
+    "Post-peak high-temperature view should keep a bounded 12-hour window",
+  );
+
   assert(
     __isTemperatureSeriesVisibleByDefaultForTest("paris", "model_curve_AROME HD"),
     "Paris AROME HD should be the only default-visible model curve exception",
diff --git a/frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts b/frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts
index 3cdcf27e..dbfbf072 100644
--- a/frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts
+++ b/frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts
@@ -1445,6 +1445,33 @@ function buildChartDomain(
   return [Number((min - pad).toFixed(1)), Number((max + pad).toFixed(1))];
 }
 
+function isLiveObservationSeries(series: EvidenceSeries) {
+  if (series.key === "hourly_forecast") return false;
+  if (series.key.startsWith("model_curve_")) return false;
+  if (series.key.startsWith("model_summary_")) return false;
+  if (["deb_prediction", "max_temp", "min_temp"].includes(series.key)) return false;
+
+  const source = String(series.source || "").toLowerCase();
+  if (source.includes("forecast") || source.includes("multi-model") || source === "deb") return false;
+  return true;
+}
+
+function latestLiveObservationTimestamp(
+  data: Array<Record<string, any>>,
+  series: EvidenceSeries[],
+) {
+  let latest: number | null = null;
+  series.filter(isLiveObservationSeries).forEach((item) => {
+    item.values.forEach((value, index) => {
+      if (validNumber(value) === null) return;
+      const ts = typeof data[index]?.ts === "number" ? data[index].ts : null;
+      if (ts === null) return;
+      latest = latest === null ? ts : Math.max(latest, ts);
+    });
+  });
+  return latest;
+}
+
 function getDebPeakWindowRange(
   data: Array<Record<string, any>>,
   series: EvidenceSeries[],
@@ -1487,6 +1514,7 @@ function getDebPeakWindowRange(
   let startTs = debPoints[hotStartPoint].ts - 1.5 * hour;
   let endTs = debPoints[hotEndPoint].ts + 2 * hour;
   const centerTs = peak.ts;
+  const latestObsTs = latestLiveObservationTimestamp(data, series);
 
   if (endTs - startTs < targetSpan) {
     startTs = centerTs - targetSpan / 2;
@@ -1496,6 +1524,12 @@ function getDebPeakWindowRange(
     startTs = centerTs - maxSpan / 2;
     endTs = centerTs + maxSpan / 2;
   }
+  if (latestObsTs !== null && latestObsTs > endTs && latestObsTs > debPoints[hotEndPoint].ts) {
+    endTs = Math.min(lastTs, latestObsTs);
+    if (endTs - startTs > maxSpan) {
+      startTs = Math.max(firstTs, endTs - maxSpan);
+    }
+  }
 
   if (startTs < firstTs) {
     endTs = Math.min(lastTs, endTs + firstTs - startTs);