Climate averages 1991–2020
Chelmsford weather
in August.
A mild, moderately wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Chelmsford: daytime highs average 21.1°C and nights cool to about 13.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 59 mm of rain on roughly 10 days, which makes August a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 38 min on an average August day.
The nearest other city in this atlas is Basildon (19 km away). In August its highs average 20.9°C, about as warm as Chelmsford, with 58 mm of rain.
Among the 143 cities listed in the United Kingdom, Chelmsford ranks joint 13th of 143 for the warmest August highs and joint 5th of 143 for the driest August (rainfall, lowest first). The mean August high of those 143 cities is 19.7°C; Chelmsford is 1.4°C warmer than that mean.
From August to September, average highs fall by 2.7°C to 18.3°C, and monthly rainfall falls from 59 mm to 46 mm.
The annual picture
August 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
Chelmsford climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.2°C2.7°C | 2.7°C | 50 | 10.7 | 8.48 h |
| February | 7.6°C2.5°C | 2.5°C | 41 | 9.1 | 9.910 h |
| March | 9.9°C3.8°C | 3.8°C | 39 | 10.0 | 11.812 h |
| April | 12.7°C5.6°C | 5.6°C | 46 | 10.8 | 13.814 h |
| May | 15.8°C8.6°C | 8.6°C | 51 | 9.8 | 15.616 h |
| June | 18.8°C11.6°C | 11.6°C | 53 | 9.9 | 16.617 h |
| July | 21.2°C13.8°C | 13.8°C | 53 | 10.8 | 16.216 h |
| August, selected | 21.1°C13.9°C | 13.9°C | 59 | 9.9 | 14.615 h |
| September | 18.3°C11.8°C | 11.8°C | 46 | 8.8 | 12.713 h |
| October | 14.4°C9.0°C | 9.0°C | 55 | 10.5 | 10.711 h |
| November | 10.2°C5.5°C | 5.5°C | 55 | 10.4 | 8.99 h |
| December | 7.6°C3.3°C | 3.3°C | 54 | 10.5 | 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
August in nearby cities
- Basildon in AugustUnited Kingdom · 19 kmHigh 20.9°C · Low 14.2°C · 58 mm rain
- Harlow in AugustUnited Kingdom · 25 kmHigh 21.1°C · Low 13.2°C · 63 mm rain
- Southend-on-Sea in AugustUnited Kingdom · 28 kmHigh 20.8°C · Low 14.6°C · 63 mm rain
- Dagenham in AugustUnited Kingdom · 29 kmHigh 21.3°C · Low 13.9°C · 60 mm rain
- Grays in AugustUnited Kingdom · 31 kmHigh 21.3°C · Low 14.0°C · 60 mm rain
- Ilford in AugustUnited Kingdom · 34 kmHigh 21.3°C · Low 13.8°C · 62 mm rain
- Colchester in AugustUnited Kingdom · 34 kmHigh 20.7°C · Low 14.4°C · 64 mm rain
- Barking in AugustUnited Kingdom · 35 kmHigh 21.4°C · Low 13.8°C · 62 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 Chelmsford) is explained once on the Chelmsford year overview and on the Sources, method and limits page.