diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index 4f366d1..607dc95 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -27,6 +27,8 @@ jobs:
         run: npm run test:run
 
       - name: Build (single-file bundle)
+        env:
+          VITE_COMMIT_HASH: ${{ github.sha }}
         run: npm run build
 
       - name: Verify build output
@@ -50,6 +52,8 @@ jobs:
         run: npm ci
 
       - name: Build (single-file bundle)
+        env:
+          VITE_COMMIT_HASH: ${{ github.sha }}
         run: npm run build
 
       - name: Verify build output
diff --git a/dist/index.html b/dist/index.html
index a4470c7..df8b7e2 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -8574,6 +8574,9 @@ delegate([
 	"touchstart",
 	"touchend"
 ]);
+//#endregion
+//#region src/main.js
+console.info({ commit_hash: "93e5660a5c76fd41088193f5ca3e3a35cd7478b1" });
 mount(App, { target: document.getElementById("app") });
 //#endregion</script>
     <style rel="stylesheet" crossorigin>/* ===== CSS Reset & Base ===== */
diff --git a/src/main.js b/src/main.js
index 4785656..2a8541d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -2,6 +2,9 @@ import { mount } from 'svelte'
 import './styles/main.css'
 import App from './App.svelte'
 
+// Report the baked-in commit hash on startup (handy for verifying a deploy).
+console.info({ commit_hash: __WEATHER_COMMIT__ })
+
 const app = mount(App, {
   target: document.getElementById('app'),
 })
diff --git a/vite.config.js b/vite.config.js
index d72ef85..bdfa993 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,9 +1,25 @@
+import { execSync } from 'node:child_process'
 import { defineConfig } from 'vite'
 import { svelte } from '@sveltejs/vite-plugin-svelte'
 import { viteSingleFile } from 'vite-plugin-singlefile'
 
 // https://vite.dev/config/
+// Bake the commit hash into the bundle at build time so a deployed app can
+// report exactly which commit produced it (logged via console.info at startup).
+// CI sets VITE_COMMIT_HASH=${{ github.sha }}; local builds fall back to git HEAD.
+function getCommitHash() {
+  if (process.env.VITE_COMMIT_HASH) return process.env.VITE_COMMIT_HASH
+  try {
+    return execSync('git rev-parse HEAD').toString().trim()
+  } catch {
+    return 'unknown'
+  }
+}
+
 export default defineConfig(({ command }) => ({
+  define: {
+    __WEATHER_COMMIT__: JSON.stringify(getCommitHash()),
+  },
   plugins: [
     svelte(),
     ...(command === 'build'