diff --git a/docs/API.md b/docs/API.md
index 52a48ec..49a5e67 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -637,4 +637,8 @@ Request:
     {
       "id": "relay_1",
       "state": true
-    }
+    }\n\n### Weather temperature sensor flag
+
+Temperature sensor config entries now include `weather: true`.
+
+When a configured temp sensor has `weather: true`, the WebUI may show it as the outside/weather temperature badge. The `/status` temp objects also include this flag so HTTP, UART, USB serial, and future Pico clients can identify the selected outside-air sensor without guessing from the sensor name.\n
\ No newline at end of file
diff --git a/docs/PARITY_MATRIX.md b/docs/PARITY_MATRIX.md
index 5e87066..1129314 100644
--- a/docs/PARITY_MATRIX.md
+++ b/docs/PARITY_MATRIX.md
@@ -105,5 +105,4 @@ Future additions must be implemented on:
     UART JSON
     HTTP API
 
-before parity is considered maintained.
-
+before parity is considered maintained.\n\n- Temperature sensor config/status parity now includes the `weather` boolean flag for outside-air display selection.\n
\ No newline at end of file
diff --git a/docs/UART_PROTOCOL.md b/docs/UART_PROTOCOL.md
index 6198a8c..9908f39 100644
--- a/docs/UART_PROTOCOL.md
+++ b/docs/UART_PROTOCOL.md
@@ -265,4 +265,8 @@ Pico sends:
 
 Alternative:
 
-    {"type":"clear_temp","slot":1}
+    {"type":"clear_temp","slot":1}\n\n### Temperature weather flag
+
+`status_response.config.temperature_sensors[]` and `status_response.temps[]` include `weather: false`.
+
+`config_temp` may include `weather: true` to mark one configured sensor as the outside/weather sensor. Pico clients should treat this as optional and default missing values to `false`.\n
\ No newline at end of file
diff --git a/docs/project-state.md b/docs/project-state.md
index 2d7794c..2625713 100644
--- a/docs/project-state.md
+++ b/docs/project-state.md
@@ -163,4 +163,4 @@ Examples:
 5. Add config backup/restore.
 6. Improve BMS out-of-range behavior without changing NimBLE connect timeout.
 
-- Fixed WebUI temperature probe scan by registering `/temps/scan`, `/temps/assign`, and `/temps/clear` firmware routes.
+- Fixed WebUI temperature probe scan by registering `/temps/scan`, `/temps/assign`, and `/temps/clear` firmware routes.\n\n- Added per-temperature-sensor `weather` flag and WebUI outside temperature badge with emoji thresholds: below 50°F ice, 50-74°F happy, 75-84°F sun, and 85°F+ fire.\n
\ No newline at end of file
diff --git a/firmware/esp32/overland-controller/app_config.cpp b/firmware/esp32/overland-controller/app_config.cpp
index 48df0a8..1391aae 100644
--- a/firmware/esp32/overland-controller/app_config.cpp
+++ b/firmware/esp32/overland-controller/app_config.cpp
@@ -31,7 +31,8 @@ void loadDefaultConfig() {
             "temp_" + String(i + 1),
             "Temperature " + String(i + 1),
             "",
-            i < appConfig.tempSensorCount
+            i < appConfig.tempSensorCount,
+            false
         };
     }
 
@@ -90,6 +91,10 @@ void loadConfig() {
                 (prefix + "enabled").c_str(),
                 appConfig.tempSensors[i].enabled
             );
+            appConfig.tempSensors[i].weather = preferences.getBool(
+                (prefix + "weather").c_str(),
+                appConfig.tempSensors[i].weather
+            );
         }
 
         appConfig.bms.enabled = preferences.getBool("bms_enabled", appConfig.bms.enabled);
@@ -124,6 +129,7 @@ void saveConfig() {
         preferences.putString((prefix + "name").c_str(), appConfig.tempSensors[i].name);
         preferences.putString((prefix + "addr").c_str(), appConfig.tempSensors[i].address);
         preferences.putBool((prefix + "enabled").c_str(), appConfig.tempSensors[i].enabled);
+        preferences.putBool((prefix + "weather").c_str(), appConfig.tempSensors[i].weather);
     }
 
     preferences.putBool("bms_enabled", appConfig.bms.enabled);
diff --git a/firmware/esp32/overland-controller/app_config.h b/firmware/esp32/overland-controller/app_config.h
index 3730708..561886c 100644
--- a/firmware/esp32/overland-controller/app_config.h
+++ b/firmware/esp32/overland-controller/app_config.h
@@ -17,6 +17,7 @@ struct TempSensorConfig {
     String name;
     String address;
     bool enabled;
+    bool weather;
 };
 
 struct BmsConfig {
diff --git a/firmware/esp32/overland-controller/overland-controller.ino b/firmware/esp32/overland-controller/overland-controller.ino
index e2860af..65d9f43 100644
--- a/firmware/esp32/overland-controller/overland-controller.ino
+++ b/firmware/esp32/overland-controller/overland-controller.ino
@@ -28,6 +28,8 @@ const char INDEX_HTML[] PROGMEM = R"rawliteral(
 body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Arial,sans-serif}
 .wrap{max-width:980px;margin:0 auto;padding:14px 14px 90px}
 .top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:12px}
+.topRight{display:grid;gap:6px;justify-items:end}
+.weatherBadge{font-size:20px;font-weight:900;color:var(--text);padding:8px 12px}
 h1{font-size:21px;margin:0}.sub{color:var(--muted);font-size:13px;margin-top:4px}
 .pill{border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:var(--muted);font-size:12px;white-space:nowrap}
 .tabs{position:fixed;left:0;right:0;bottom:0;background:#080c11;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);z-index:10}
@@ -67,7 +69,10 @@ input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;ba
       <h1 id="device">Overland Controller</h1>
       <div class="sub" id="subtitle">Local camp dashboard</div>
     </div>
-    <div class="pill" id="conn">Connecting...</div>
+    <div class="topRight">
+      <div class="pill weatherBadge" id="weatherBadge" style="display:none">--</div>
+      <div class="pill" id="conn">Connecting...</div>
+    </div>
   </div>
 
   <div id="overviewPage" class="page active">
@@ -233,6 +238,29 @@ input{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px;ba
 const $=id=>document.getElementById(id);
 function fmt(n,d=1){return typeof n==="number"?n.toFixed(d):"--"}
 function temp(v){return typeof v==="number"?fmt(v,1)+"°F":"Offline"}
+function weatherEmoji(f){
+  if(typeof f!=="number") return "";
+  if(f < 50) return "🧊";
+  if(f < 75) return "🙂";
+  if(f < 85) return "☀️";
+  return "🔥";
+}
+function renderWeatherBadge(data){
+  const badge=$("weatherBadge");
+  if(!badge) return;
+
+  const sensor=(data.temps||[]).find(t=>t.enabled && t.weather && t.online && typeof t.temperature_f==="number");
+  if(!sensor){
+    badge.style.display="none";
+    badge.textContent="--";
+    return;
+  }
+
+  const rounded=Math.round(sensor.temperature_f);
+  badge.textContent=`${weatherEmoji(rounded)} ${rounded}°F`;
+  badge.title=sensor.name||sensor.id||"Weather sensor";
+  badge.style.display="";
+}
 function formatHours(hours){
   if(typeof hours!=="number" || !isFinite(hours) || hours<=0){
     return "Idle";
@@ -303,6 +331,7 @@ function render(data){
   $("conn").textContent="Live";
   $("conn").className="pill good";
   $("device").textContent=data.config?.device_name||"Overland Controller";
+  renderWeatherBadge(data);
 
   const b=data.battery||{};
   $("soc").textContent=fmt(b.soc,0);
@@ -510,6 +539,10 @@ function renderConfigControls(data){
           <input id="tempEnabled${i}" type="checkbox" ${t.enabled?"checked":""}>
           On
         </label>
+        <label>
+          <input id="tempWeather${i}" type="checkbox" ${t.weather?"checked":""}>
+          Weather
+        </label>
       </div>`).join("");
   }
 }
@@ -553,6 +586,7 @@ async function saveTempConfig(){
     const name=$("tempName"+i)?.value.trim() || temps[i].name || temps[i].id;
     const manual=$("tempEnabled"+i)?.checked;
     const enabled=(i<count) || manual;
+    const weather=$("tempWeather"+i)?.checked || false;
 
     await fetch("/config/temp",{
       method:"POST",
@@ -561,7 +595,8 @@ async function saveTempConfig(){
         id:temps[i].id,
         name:name,
         address:temps[i].address||"",
-        enabled:enabled
+        enabled:enabled,
+        weather:weather
       })
     });
   }
@@ -884,6 +919,7 @@ void buildStatusDocument(JsonDocument& doc) {
         temp["id"] = appConfig.tempSensors[i].id;
         temp["name"] = appConfig.tempSensors[i].name;
         temp["enabled"] = appConfig.tempSensors[i].enabled;
+        temp["weather"] = appConfig.tempSensors[i].weather;
         temp["online"] = sensors.online[i];
         if (sensors.online[i]) {
             temp["temperature_f"] = sensors.tempsF[i];
@@ -970,6 +1006,7 @@ void buildStatusDocument(JsonDocument& doc) {
         tempConfig["name"] = appConfig.tempSensors[i].name;
         tempConfig["address"] = appConfig.tempSensors[i].address;
         tempConfig["enabled"] = appConfig.tempSensors[i].enabled;
+        tempConfig["weather"] = appConfig.tempSensors[i].weather;
     }
 }
 
@@ -1924,6 +1961,7 @@ void handleUpdateTempSensorConfig() {
     if (doc["name"].is<String>()) appConfig.tempSensors[index].name = doc["name"].as<String>();
     if (doc["address"].is<String>()) appConfig.tempSensors[index].address = doc["address"].as<String>();
     if (doc["enabled"].is<bool>()) appConfig.tempSensors[index].enabled = doc["enabled"].as<bool>();
+    if (doc["weather"].is<bool>()) appConfig.tempSensors[index].weather = doc["weather"].as<bool>();
 
     sendOkConfig();
 }