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Hertfordshire (Stevenage)
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United Kingdom weather

Weather in Hertfordshire for September 2025

Your guide to Hertfordshire weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Hertfordshire is cooler than usual, with temperatures averaging 19.1 °C, this is -2.1 °C below the typical seasonal average.

  • The forecast for the next days in Hertfordshire predicts temperatures to be around 17 °C, close to the historical average.

  • In general, the average temperature in Hertfordshire at the beginning of September is 22.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.6 °C by the end of September.

    • Rain 🌧️

  • Hertfordshire in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 76.2 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
21 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Hertfordshire 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
Mist
22°
3
Overcast
22°
4
Sunny
21°
5
Cloudy
22°
6
Cloudy
25°
7
Sunny
25°
8
Partly cloudy
23°
9
Sunny
22°
10
Light rain shower
23°
11
Cloudy
19°
12
Mist
16°
13
Overcast
17°
14
Partly cloudy
18°
15
Partly cloudy
20°
16
Partly cloudy
21°
17
Moderate rain
20°
18
Overcast
23°
19
Partly cloudy
25°
20
Patchy rain possible
22°
21
Patchy rain possible
20°
22
Patchy rain possible
16°
23
Partly cloudy
15°
24
Sunny
16°
25
Sunny
17°
26
Partly cloudy
16°
27
Partly cloudy
15°
28
Patchy rain possible
13°
29
Patchy rain possible
12°
30
Patchy rain possible
13°

Temperatures trend during September in Hertfordshire

See the weather trend as well as the moving average line

September weather in Hertfordshire 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° 2.7 mm 5
2 Sept. Mist
Mist
 22° /13° 2 mm 5
3 Sept. Overcast
Overcast
 22° /13° 3.3 mm 5
4 Sept. Sunny
Sunny
 21° /12° 6.7 mm 5
5 Sept. Cloudy
Cloudy
 22° /12° 2.3 mm 5
6 Sept. Cloudy
Cloudy
 25° /15° 0.6 mm 6
7 Sept. Sunny
Sunny
 25° /15° 2.1 mm 6
8 Sept. Partly cloudy
Partly cloudy
 23° /15° 5.4 mm 5
9 Sept. Sunny
Sunny
 22° /13° 0 mm 6
10 Sept. Light rain shower
Light rain shower
 23° /13° 1.7 mm 5
11 Sept. Cloudy
Cloudy
 19° /11° 0.9 mm 4
12 Sept. Mist
Mist
 16° /9° 1 mm 4
13 Sept. Overcast
Overcast
 17° /9° 0.7 mm 4
14 Sept. Partly cloudy
Partly cloudy
 18° /9° 1.8 mm 5
15 Sept. Partly cloudy
Partly cloudy
 20° /11° 0.1 mm 5
16 Sept. Partly cloudy
Partly cloudy
 21° /11° 0 mm 5
17 Sept. Moderate rain
Moderate rain
 20° /12° 2.5 mm 5
18 Sept. Overcast
Overcast
 23° /16° 0.1 mm 0.6
19 Sept. Partly cloudy
Partly cloudy
 25° /15° 0 mm 1
20 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 2 mm 0.5
21 Sept. Patchy rain possible
Patchy rain possible
 20° /12° 4.2 mm 0.7
22 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 2.2 mm 0.7
23 Sept. Partly cloudy
Partly cloudy
 15° /8° 0 mm 4
24 Sept. Sunny
Sunny
 16° /6° 0 mm 4
25 Sept. Sunny
Sunny
 17° /7° 0 mm 4
26 Sept. Partly cloudy
Partly cloudy
 16° /8° 0 mm 4
27 Sept. Partly cloudy
Partly cloudy
 15° /8° 0 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 13° /11° 0.4 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 12° /8° 2 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 13° /8° 0.1 mm 2
Next
Important Notice
Our weather forecast for Hertfordshire 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 Hertfordshire forecast closer to your planned date for the most up-to-date weather information.
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Hertfordshire in September - FAQ

What are the expected maximum and minimum temperatures in Hertfordshire 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 Hertfordshire during September?
Moderate rainfall is anticipated in Hertfordshire during September, with a total of 76.2 mm spread over approximately 18 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Hertfordshire during September?
The average wind speed in Hertfordshire during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Hertfordshire

Explore the daily rainfall trends and prepare for Hertfordshires September weather 💧

UV exposure in Hertfordshire during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Hertfordshire
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Bishops StortfordHemel HempsteadSt AlbansStevenageWatfordWelwyn Garden City
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Location coordinates Where is Hertfordshire?

Get accurate weather forecasts for Hertfordshire, located at latitude 51.902 and longitude -0.203. Stay updated with localized weather information tailored for Hertfordshire.

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