diff --git a/backend/src/lib/weather-fetch.js b/backend/src/lib/weather-fetch.js
index 94cab47..349e522 100644
--- a/backend/src/lib/weather-fetch.js
+++ b/backend/src/lib/weather-fetch.js
@@ -122,9 +122,20 @@ async function fetchMetOfficeThreeHourly(lat, lon, apiKey, dayKeys) {
 // response is the only one with sunrise/sunset fields, so the two travel together;
 // if this tier falls back to Open-Meteo, astro falls back with it (see
 // openMeteoAstroPoints below).
-async function fetchMetOfficeDaily(lat, lon, apiKey, skipKeys, astroKeys) {
+//
+// Filters by "date key > cutoffKey" (day+2) rather than excluding an exact set of
+// keys — Met Office's daily series has been observed to include a stray leftover
+// entry for today/yesterday that an exact-match skip list doesn't catch, which
+// then sorts to the front of the window and shows up as an extra day ahead of the
+// real day+3..+6 (seen live 2026-08-31: a stray Sunday entry displayed before
+// Thu/Fri/Sat). Explicitly sorting before slicing guards the same window against
+// the provider not returning entries in chronological order at all.
+async function fetchMetOfficeDaily(lat, lon, apiKey, cutoffKey, astroKeys) {
   const series = await fetchMetOfficeTimestep('daily', lat, lon, apiKey)
-  const dayRows = series.filter(p => !skipKeys.has(londonDateKey(p.time))).slice(0, 4)
+  const dayRows = series
+    .filter(p => londonDateKey(p.time) > cutoffKey)
+    .sort((a, b) => a.time.localeCompare(b.time))
+    .slice(0, 4)
   const dailyPoints = assertParsed(dayRows.length, dayRows
     .map(p => ({
       resolution: 'daily',
@@ -211,9 +222,10 @@ function openMeteoThreeHourlyPoints(hourlyRows, dayKeys) {
       source: 'open_meteo',
     }))
 }
-function openMeteoDailyPoints(dailyRows, skipKeys) {
+function openMeteoDailyPoints(dailyRows, cutoffKey) {
   return dailyRows
-    .filter(r => !skipKeys.has(r.dateKey))
+    .filter(r => r.dateKey > cutoffKey)
+    .sort((a, b) => a.dateKey.localeCompare(b.dateKey))
     .slice(0, 4)
     .map(r => ({
       resolution: 'daily',
@@ -321,7 +333,10 @@ export async function refreshForecast(log = console) {
 
     const today = londonDateKey(new Date().toISOString())
     const dayKeys = [londonDateKeyPlusDays(1), londonDateKeyPlusDays(2)]
-    const skipKeys = new Set([today, ...dayKeys])
+    // The 'daily' tier (days 4-7) keeps anything strictly after this date key —
+    // see fetchMetOfficeDaily's comment for why an exact-match skip list isn't
+    // used here.
+    const cutoffKey = dayKeys[dayKeys.length - 1]
     const astroKeys = [today, ...dayKeys]
 
     const metOffice = await getIntegration('met_office')
@@ -337,7 +352,7 @@ export async function refreshForecast(log = console) {
       const [hourlyR, threeHourlyR, dailyR] = await Promise.allSettled([
         fetchWithKeys(key => fetchMetOfficeHourly(lat, lon, key), keys),
         fetchWithKeys(key => fetchMetOfficeThreeHourly(lat, lon, key, dayKeys), keys),
-        fetchWithKeys(key => fetchMetOfficeDaily(lat, lon, key, skipKeys, astroKeys), keys),
+        fetchWithKeys(key => fetchMetOfficeDaily(lat, lon, key, cutoffKey, astroKeys), keys),
       ])
 
       if (hourlyR.status === 'fulfilled') {
@@ -376,7 +391,7 @@ export async function refreshForecast(log = console) {
         tierSource.threeHourly = 'open_meteo'
       }
       if (!tierSource.daily) {
-        dailyPoints = openMeteoDailyPoints(dailyRows, skipKeys)
+        dailyPoints = openMeteoDailyPoints(dailyRows, cutoffKey)
         astroPoints = openMeteoAstroPoints(dailyRows, astroKeys)
         tierSource.daily = 'open_meteo'
       }