Chelmsford
September
Weather in Chelmsford for September 2025
Your guide to Chelmsford weather in September - trends and predictions
In general, the average temperature in Chelmsford at the beginning of September is 23.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.6 °C by the end of September.
Chelmsford sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
22°/14°
Temperatures
21 km/h
Avg max wind
69 %
Avg humidity
Chelmsford in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  23° | 3 23° | 4  21° | 5 22° | 6 27° | 7 25° |
| 8 24° | 9 24° | 10  24° | 11 20° | 12 17° | 13 17° | 14 20° |
| 15 22° | 16 22° | 17  20° | 18 22° | 19  20° | 20  20° | 21 20° |
| 22 18° | 23 18° | 24 18° | 25 19° | 26 20° | 27  17° | 28 16° |
| 29 16° | 30 17° |
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Temperatures trend during September in Chelmsford
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 23° /14° | 3.3 mm | 5 | |
| 2 Sept. | Overcast | 23° /15° | 0.2 mm | 5 | |
| 3 Sept. | Overcast | 23° /13° | 0.9 mm | 5 | |
| 4 Sept. | Sunny | 21° /14° | 1.8 mm | 5 | |
| 5 Sept. | Overcast | 22° /14° | 2.1 mm | 5 | |
| 6 Sept. | Sunny | 27° /16° | 0.6 mm | 7 | |
| 7 Sept. | Sunny | 25° /16° | 4.9 mm | 6 | |
| 8 Sept. | Overcast | 24° /15° | 4.6 mm | 5 | |
| 9 Sept. | Sunny | 24° /15° | 0.1 mm | 6 | |
| 10 Sept. | Partly cloudy | 24° /15° | 1.8 mm | 6 | |
| 11 Sept. | Cloudy | 20° /12° | 0.6 mm | 5 | |
| 12 Sept. | Overcast | 17° /10° | 0 mm | 4 | |
| 13 Sept. | Overcast | 17° /10° | 0 mm | 4 | |
| 14 Sept. | Cloudy | 20° /10° | 0 mm | 5 | |
| 15 Sept. | Sunny | 22° /12° | 0 mm | 6 | |
| 16 Sept. | Cloudy | 22° /12° | 0 mm | 5 | |
| 17 Sept. | Patchy rain possible | 20° /13° | 0.2 mm | 5 | |
| 18 Sept. | Light rain shower | 22° /12° | 3.3 mm | 5 | |
| 19 Sept. | Light drizzle | 20° /13° | 1.1 mm | 5 | |
| 20 Sept. | Moderate rain | 20° /14° | 12.1 mm | 5 | |
| 21 Sept. | Light rain shower | 20° /12° | 4.4 mm | 5 | |
| 22 Sept. | Patchy light drizzle | 18° /13° | 11.3 mm | 4 | |
| 23 Sept. | Patchy rain possible | 18° /10° | 1 mm | 5 | |
| 24 Sept. | Overcast | 18° /11° | 0.6 mm | 4 | |
| 25 Sept. | Overcast | 19° /12° | 1.8 mm | 5 | |
| 26 Sept. | Light rain shower | 20° /12° | 8.6 mm | 5 | |
| 27 Sept. | Mist | 17° /10° | 4.4 mm | 4 | |
| 28 Sept. | Cloudy | 16° /8° | 0 mm | 4 | |
| 29 Sept. | Light rain shower | 16° /9° | 1.4 mm | 4 | |
| 30 Sept. | Partly cloudy | 17° /10° | 10.7 mm | 5 | |
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Important Notice
Our weather forecast for Chelmsford in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Chelmsford forecast closer to your planned date for the most up-to-date weather information.
Chelmsford in September - FAQ
What are the expected maximum and minimum temperatures in Chelmsford during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chelmsford during September?
In September, Chelmsford can expect light to moderate rainfall, totaling 43.6 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Chelmsford during September?
The average wind speed in Chelmsford during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
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