Hertfordshire (Stevenage)
September
Weather in Hertfordshire for September 2026
Your guide to Hertfordshire weather in September - trends and predictions
Until now, September 2026 in Hertfordshire is slightly cooler than the historical average by 0.7 °C.
The forecast for the next days in Hertfordshire predicts temperatures to be around 23 °C, close to the historical average.
In general, the average temperature in Hertfordshire at the beginning of September is 22.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 23 °C by the end of September.
Hertfordshire experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 66.1 mm.
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Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
19°/12°
Temperatures
22 km/h
Avg max wind
72 %
Avg humidity
Hertfordshire Weather September
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Temperatures trend during September in Hertfordshire
See the weather trend as well as the moving average line
September weather in Hertfordshire day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 22° /12° | 2 mm | 5 | |
| 2 Sept. |  Mist | 21° /13° | 1.5 mm | 4 | |
| 3 Sept. |  Overcast | 22° /14° | 2.6 mm | 4 | |
| 4 Sept. |  Sunny | 21° /12° | 5.1 mm | 4 | |
| 5 Sept. |  Cloudy | 22° /12° | 1.8 mm | 5 | |
| 6 Sept. | Overcast | 25° /15° | 0.4 mm | 5 | |
| 7 Sept. | Sunny | 25° /15° | 1.6 mm | 5 | |
| 8 Sept. |  Partly cloudy | 21° /14° | 7 mm | 5 | |
| 9 Sept. | Overcast | 21° /12° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 22° /12° | 2.1 mm | 4 | |
| 11 Sept. | Cloudy | 20° /11° | 0.9 mm | 4 | |
| 12 Sept. | Mist | 18° /10° | 0.8 mm | 3 | |
| 13 Sept. | Overcast | 18° /11° | 1.9 mm | 3 | |
| 14 Sept. | Partly cloudy | 19° /11° | 1.5 mm | 4 | |
| 15 Sept. | Patchy rain possible | 21° /11° | 0.1 mm | 4 | |
| 16 Sept. | Patchy rain possible | 20° /11° | 0.1 mm | 4 | |
| 17 Sept. |  Moderate rain | 19° /11° | 2.2 mm | 4 | |
| 18 Sept. | Overcast | 21° /12° | 1.5 mm | 4 | |
| 19 Sept. | Partly cloudy | 22° /13° | 0.8 mm | 6 | |
| 20 Sept. | Overcast | 19° /13° | 0 mm | 3.4 | |
| 21 Sept. | Sunny | 22° /11° | 0 mm | 3.9 | |
| 22 Sept. | Sunny | 24° /15° | 0 mm | 3.7 | |
| 23 Sept. | Overcast | 22° /11° | 0.1 mm | 3.1 | |
| 24 Sept. | Sunny | 19° /9° | 0 mm | 5 | |
| 25 Sept. | Sunny | 20° /11° | 0 mm | 5 | |
| 26 Sept. | Sunny | 26° /13° | 0 mm | 7 | |
| 27 Sept. | Sunny | 22° /15° | 0 mm | 6 | |
| 28 Sept. | Sunny | 25° /15° | 0 mm | 6 | |
| 29 Sept. | Sunny | 26° /14° | 0 mm | 7 | |
| 30 Sept. | Overcast | 23° /18° | 0 mm | 5 | |
| 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.
Change Month
Hertfordshire in September - FAQ
What are the expected maximum and minimum temperatures in Hertfordshire during September?
Enjoy moderate daytime temperatures of up to 19° 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 66.1 mm spread over approximately 21 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 22 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 💧
Typically, Hertfordshire has 21 rainy days in September with a total of 66.1 mm of rainfall.
UV exposure in Hertfordshire during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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