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Weather in Chelmsford for September 2026

Your guide to Chelmsford weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Chelmsford is slightly cooler than the historical average by 1 °C.

  • The forecast for the next days in Chelmsford predicts temperatures to be around 22 °C, close to the historical average.

  • In general, the average temperature in Chelmsford at the beginning of September is 22.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.6 °C by the end of September.

    • Rain 🌧️

  • Chelmsford in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 62.1 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/12°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Chelmsford Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
22°
2
Overcast
22°
3
Overcast
23°
4
Light rain shower
21°
5
Overcast
22°
6
Overcast
25°
7
Sunny
24°
8
Overcast
21°
9
Patchy rain possible
22°
10
Light rain shower
22°
11
Cloudy
20°
12
Overcast
24°
13
Patchy rain possible
24°
14
Overcast
25°
15
Sunny
26°
16
Sunny
18°
17
Overcast
18°
18
Overcast
19°
19
Overcast
21°
20
Overcast
24°
21
Sunny
18°
22
Overcast
20°
23
Overcast
21°
24
Overcast
21°
25
Sunny
29°
26
Light rain shower
18°
27
Mist
17°
28
Cloudy
17°
29
Overcast
17°
30
Partly cloudy
18°

Temperatures trend during September in Chelmsford

See the weather trend as well as the moving average line

September weather in Chelmsford day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 22° /13° 2.1 mm 5
2 Sept. Overcast
Overcast
 22° /13° 0.7 mm 4
3 Sept. Overcast
Overcast
 23° /14° 1.4 mm 4
4 Sept. Light rain shower
Light rain shower
 21° /13° 1.8 mm 4
5 Sept. Overcast
Overcast
 22° /13° 1 mm 5
6 Sept. Overcast
Overcast
 25° /15° 0.3 mm 5
7 Sept. Sunny
Sunny
 24° /15° 2.7 mm 5
8 Sept. Overcast
Overcast
 21° /14° 5.3 mm 4
9 Sept. Patchy rain possible
Patchy rain possible
 22° /12° 0 mm 5
10 Sept. Light rain shower
Light rain shower
 22° /13° 1.1 mm 5
11 Sept. Cloudy
Cloudy
 20° /12° 1.1 mm 4
12 Sept. Overcast
Overcast
 24° /14° 0.3 mm 4
13 Sept. Patchy rain possible
Patchy rain possible
 24° /17° 4 mm 3.5
14 Sept. Overcast
Overcast
 25° /15° 0.1 mm 4.1
15 Sept. Sunny
Sunny
 26° /15° 0.5 mm 7
16 Sept. Sunny
Sunny
 18° /11° 0.7 mm 5
17 Sept. Overcast
Overcast
 18° /11° 0.8 mm 5
18 Sept. Overcast
Overcast
 19° /10° 0 mm 4
19 Sept. Overcast
Overcast
 21° /11° 0 mm 5
20 Sept. Overcast
Overcast
 24° /14° 0 mm 6
21 Sept. Sunny
Sunny
 18° /9° 0 mm 5
22 Sept. Overcast
Overcast
 20° /10° 0 mm 4
23 Sept. Overcast
Overcast
 21° /14° 0 mm 5
24 Sept. Overcast
Overcast
 21° /14° 0 mm 5
25 Sept. Sunny
Sunny
 29° /16° 0 mm 7
26 Sept. Light rain shower
Light rain shower
 18° /10° 6 mm 4
27 Sept. Mist
Mist
 17° /9° 2.9 mm 4
28 Sept. Cloudy
Cloudy
 17° /9° 0 mm 4
29 Sept. Overcast
Overcast
 17° /9° 0.9 mm 4
30 Sept. Partly cloudy
Partly cloudy
 18° /10° 7.1 mm 5
Next
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.
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Chelmsford in September - FAQ

What are the expected maximum and minimum temperatures in Chelmsford during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Chelmsford during September?
Moderate rainfall is anticipated in Chelmsford during September, with a total of 62.1 mm spread over approximately 18 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Chelmsford during September?
The average wind speed in Chelmsford during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Chelmsford

Explore the daily rainfall trends and prepare for Chelmsfords September weather 💧
Typically, Chelmsford has 18 rainy days in September with a total of 62.1 mm of rainfall.

UV exposure in Chelmsford during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Chelmsford?

Get accurate weather forecasts for Chelmsford, located at latitude 51.736 and longitude 0.47. Stay updated with localized weather information tailored for Chelmsford.

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