Climate averages 1991–2020
Luton weather
in September.
A mild, moderately wet month: the 4th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Luton: daytime highs average 17.9°C and nights cool to about 10.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 51 mm of rain on roughly 9 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 43 min on an average September day.
The nearest other city in this atlas is Hemel Hempstead (14 km away). In September its highs average 17.7°C, about as warm as Luton, with 51 mm of rain.
Among the 143 cities listed in the United Kingdom, Luton ranks joint 48th of 143 for the warmest September highs and joint 31st of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Luton is 0.7°C warmer than that mean.
From September to October, average highs fall by 4.0°C to 13.9°C, and monthly rainfall rises from 51 mm to 59 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Luton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.7°C1.8°C | 1.8°C | 52 | 11.0 | 8.38 h |
| February | 7.3°C1.7°C | 1.7°C | 42 | 9.7 | 9.910 h |
| March | 9.8°C2.9°C | 2.9°C | 44 | 10.2 | 11.812 h |
| April | 12.7°C4.5°C | 4.5°C | 50 | 11.3 | 13.914 h |
| May | 15.8°C7.6°C | 7.6°C | 56 | 10.7 | 15.616 h |
| June | 18.7°C10.6°C | 10.6°C | 59 | 10.1 | 16.617 h |
| July | 21.0°C12.9°C | 12.9°C | 60 | 11.1 | 16.216 h |
| August | 20.7°C12.8°C | 12.8°C | 61 | 10.8 | 14.615 h |
| September, selected | 17.9°C10.6°C | 10.6°C | 51 | 8.9 | 12.713 h |
| October | 13.9°C7.9°C | 7.9°C | 59 | 11.0 | 10.711 h |
| November | 9.7°C4.5°C | 4.5°C | 58 | 11.0 | 8.99 h |
| December | 7.0°C2.4°C | 2.4°C | 55 | 11.1 | 7.98 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Hemel Hempstead in SeptemberUnited Kingdom · 14 kmHigh 17.7°C · Low 10.7°C · 51 mm rain
- Stevenage in SeptemberUnited Kingdom · 15 kmHigh 18.1°C · Low 10.8°C · 51 mm rain
- St Albans in SeptemberUnited Kingdom · 16 kmHigh 18.0°C · Low 10.9°C · 49 mm rain
- Watford in SeptemberUnited Kingdom · 25 kmHigh 18.1°C · Low 11.1°C · 51 mm rain
- Aylesbury in SeptemberUnited Kingdom · 28 kmHigh 18.0°C · Low 10.6°C · 53 mm rain
- Bedford in SeptemberUnited Kingdom · 29 kmHigh 18.5°C · Low 11.0°C · 50 mm rain
- Milton Keynes in SeptemberUnited Kingdom · 29 kmHigh 17.7°C · Low 10.5°C · 54 mm rain
- Harrow in SeptemberUnited Kingdom · 34 kmHigh 18.1°C · Low 11.1°C · 47 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Luton) is explained once on the Luton year overview and on the Sources, method and limits page.