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Weather in Chelmsford for September 2025

Your guide to Chelmsford weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Yellow Wind Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Chelmsford is slightly cooler than the historical average by -1.7 °C.

  • The forecast for the next days in Chelmsford predicts a temperature of 17 °C, which is cooler than 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 14.9 °C by the end of September.

    • Rain 🌧️

  • Chelmsford in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 81.7 mm.

    • More

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

Average dry days
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/13°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Chelmsford Weather September

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

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° 2.8 mm 5
2 Sept. Overcast
Overcast
 22° /14° 1 mm 5
3 Sept. Light rain shower
Light rain shower
 23° /14° 1.8 mm 5
4 Sept. Light rain shower
Light rain shower
 20° /13° 2.2 mm 5
5 Sept. Overcast
Overcast
 22° /13° 1.4 mm 5
6 Sept. Sunny
Sunny
 25° /15° 0.4 mm 6
7 Sept. Sunny
Sunny
 25° /15° 3.5 mm 6
8 Sept. Overcast
Overcast
 23° /14° 3.1 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 23° /13° 0.1 mm 6
10 Sept. Light rain shower
Light rain shower
 23° /14° 1.5 mm 6
11 Sept. Cloudy
Cloudy
 20° /11° 1 mm 4
12 Sept. Overcast
Overcast
 17° /10° 0.2 mm 4
13 Sept. Overcast
Overcast
 17° /10° 0.7 mm 4
14 Sept. Cloudy
Cloudy
 19° /9° 0.9 mm 5
15 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 0.3 mm 0.9
16 Sept. Partly cloudy
Partly cloudy
 19° /12° 0 mm 0.8
17 Sept. Moderate rain
Moderate rain
 17° /11° 6.8 mm 0.1
18 Sept. Partly cloudy
Partly cloudy
 23° /17° 0 mm 1
19 Sept. Cloudy
Cloudy
 25° /15° 0 mm 0.9
20 Sept. Patchy rain possible
Patchy rain possible
 20° /15° 0.3 mm 4
21 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 0.3 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 0.7 mm 3
23 Sept. Partly cloudy
Partly cloudy
 17° /10° 0 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 15° /13° 4.2 mm 3
25 Sept. Moderate rain
Moderate rain
 12° /11° 13.2 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 14° /11° 0.1 mm 3
27 Sept. Partly cloudy
Partly cloudy
 15° /9° 0 mm 4
28 Sept. Partly cloudy
Partly cloudy
 15° /7° 0 mm 4
29 Sept. Light rain shower
Light rain shower
 16° /9° 1.4 mm 4
30 Sept. Partly cloudy
Partly cloudy
 17° /10° 10.7 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 13°. 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 81.7 mm spread over approximately 17 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 21 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 💧

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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