Hertfordshire (Stevenage)
September
Weather in Hertfordshire for September 2025
Your guide to Hertfordshire weather in September - trends and predictions
In general, the average temperature in Hertfordshire at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.7 °C by the end of September.
Hertfordshire sees moderate rainfall in September, averaging 7 rainy days.
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23
Dry days
7
Rainy days
0
Snow days
22°/14°
Temperatures
21 km/h
Avg max wind
70 %
Avg humidity
Hertfordshire in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2 23° | 3  22° | 4  22° | 5  23° | 6 27° | 7 26° |
| 8  23° | 9 23° | 10 24° | 11 19° | 12 16° | 13 17° | 14 19° |
| 15 22° | 16 22° | 17  20° | 18  22° | 19  20° | 20  20° | 21 20° |
| 22 18° | 23 17° | 24 18° | 25 18° | 26  19° | 27 16° | 28 15° |
| 29 15° | 30 16° |
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Temperatures trend during September in Hertfordshire
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. | Mist | 23° /13° | 3.1 mm | 6 | |
| 2 Sept. | Mist | 23° /15° | 0.7 mm | 5 | |
| 3 Sept. | Overcast | 22° /13° | 0.7 mm | 5 | |
| 4 Sept. | Sunny | 22° /13° | 3.3 mm | 6 | |
| 5 Sept. | Cloudy | 23° /13° | 3.5 mm | 5 | |
| 6 Sept. | Cloudy | 27° /16° | 0.9 mm | 6 | |
| 7 Sept. | Sunny | 26° /16° | 3 mm | 7 | |
| 8 Sept. | Partly cloudy | 23° /16° | 8.2 mm | 6 | |
| 9 Sept. | Sunny | 23° /14° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 24° /14° | 1.5 mm | 6 | |
| 11 Sept. | Cloudy | 19° /11° | 0.7 mm | 4 | |
| 12 Sept. | Mist | 16° /10° | 0.5 mm | 4 | |
| 13 Sept. | Overcast | 17° /9° | 0 mm | 4 | |
| 14 Sept. | Partly cloudy | 19° /10° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 22° /11° | 0 mm | 5 | |
| 16 Sept. | Partly cloudy | 22° /11° | 0 mm | 6 | |
| 17 Sept. | Moderate rain | 20° /12° | 2.5 mm | 5 | |
| 18 Sept. | Light rain shower | 22° /11° | 2.8 mm | 5 | |
| 19 Sept. | Light rain | 20° /12° | 1.2 mm | 5 | |
| 20 Sept. | Moderate or heavy rain shower | 20° /13° | 9.2 mm | 5 | |
| 21 Sept. | Patchy light drizzle | 20° /11° | 2.6 mm | 5 | |
| 22 Sept. | Light rain shower | 18° /12° | 9.3 mm | 4 | |
| 23 Sept. | Patchy rain possible | 17° /10° | 0.2 mm | 4 | |
| 24 Sept. | Overcast | 18° /11° | 1.8 mm | 4 | |
| 25 Sept. | Overcast | 18° /12° | 2.5 mm | 5 | |
| 26 Sept. | Thundery outbreaks possible | 19° /11° | 3.3 mm | 5 | |
| 27 Sept. | Patchy rain possible | 16° /9° | 3.7 mm | 4 | |
| 28 Sept. | Overcast | 15° /8° | 0.1 mm | 4 | |
| 29 Sept. | Patchy rain possible | 15° /9° | 1.7 mm | 4 | |
| 30 Sept. | Cloudy | 16° /9° | 9.4 mm | 4 | |
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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.
Hertfordshire in September - FAQ
What are the expected maximum and minimum temperatures in Hertfordshire 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 Hertfordshire during September?
In September, Hertfordshire can expect light to moderate rainfall, totaling 37.3 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
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 ☀️
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