diff --git a/backend/src/lib/weather-fetch.js b/backend/src/lib/weather-fetch.js
index 349e522..862c36f 100644
--- a/backend/src/lib/weather-fetch.js
+++ b/backend/src/lib/weather-fetch.js
@@ -42,6 +42,14 @@ function londonDateKey(isoTime) {
 function londonHour(isoTime) {
   return parseInt(new Date(isoTime).toLocaleString('en-GB', { timeZone: 'Europe/London', hour: '2-digit', hour12: false }))
 }
+// The 3-hourly tier (tomorrow/day-after "Coming up" cards) drops the very early
+// morning slots nobody's checking the display for. A threshold rather than an
+// exact hour set — Met Office's feed is a fixed UTC-aligned 3-hour cadence, so
+// its London-local hours shift by 1 across the BST/GMT change (right now, BST,
+// that's 1/4/7/10/13/16/19/22; in winter it's 0/3/6/9/12/15/18/21). ">= 6" drops
+// the same two earliest slots either way instead of matching zero points once
+// the clocks change.
+const THREE_HOURLY_MIN_HOUR = 6
 // Pure date math, not derived from any provider response — "tomorrow"/"day after"
 // are always just today+1/+2 regardless of source, which is what lets each tier
 // below be fetched (and fall back) fully independently of the others.
@@ -100,7 +108,7 @@ async function fetchMetOfficeHourly(lat, lon, apiKey) {
 
 async function fetchMetOfficeThreeHourly(lat, lon, apiKey, dayKeys) {
   const series = await fetchMetOfficeTimestep('three-hourly', lat, lon, apiKey)
-  const dayRows = series.filter(p => dayKeys.includes(londonDateKey(p.time)))
+  const dayRows = series.filter(p => dayKeys.includes(londonDateKey(p.time)) && londonHour(p.time) >= THREE_HOURLY_MIN_HOUR)
   const points = dayRows
     .map(p => ({
       resolution: '3hourly',
@@ -208,7 +216,7 @@ function openMeteoHourlyPoints(hourlyRows) {
 }
 function openMeteoThreeHourlyPoints(hourlyRows, dayKeys) {
   return hourlyRows
-    .filter(r => dayKeys.includes(r.dateKey) && r.hour % 3 === 0)
+    .filter(r => dayKeys.includes(r.dateKey) && r.hour % 3 === 0 && r.hour >= THREE_HOURLY_MIN_HOUR)
     .map(r => ({
       resolution: '3hourly',
       ts: r.time,