Harrow
September
Weather in Harrow for September 2025
Your guide to Harrow weather in September - trends and predictions
In general, the average temperature in Harrow at the beginning of September is 23.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.3 °C by the end of September.
Harrow sees moderate rainfall in September, averaging 8 rainy days.
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22
Dry days
8
Rainy days
0
Snow days
22°/15°
Temperatures
17 km/h
Avg max wind
68 %
Avg humidity
Harrow in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  23° | 3 23° | 4  22° | 5  22° | 6 26° | 7 26° |
| 8 24° | 9 24° | 10 25° | 11 19° | 12 17° | 13 17° | 14 20° |
| 15 22° | 16 22° | 17 21° | 18 22° | 19  20° | 20  20° | 21 21° |
| 22 18° | 23 17° | 24  18° | 25 19° | 26  19° | 27 16° | 28 16° |
| 29 16° | 30 17° |
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Temperatures trend during September in Harrow
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. | Overcast | 23° /14° | 7 mm | 5 | |
| 2 Sept. | Patchy rain possible | 23° /16° | 0.3 mm | 5 | |
| 3 Sept. | Overcast | 23° /14° | 0.9 mm | 5 | |
| 4 Sept. | Sunny | 22° /14° | 4.6 mm | 6 | |
| 5 Sept. | Partly cloudy | 22° /15° | 5 mm | 6 | |
| 6 Sept. | Overcast | 26° /17° | 2.3 mm | 6 | |
| 7 Sept. | Sunny | 26° /16° | 2.8 mm | 7 | |
| 8 Sept. | Partly cloudy | 24° /17° | 12.3 mm | 6 | |
| 9 Sept. | Sunny | 24° /16° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 25° /15° | 1.5 mm | 6 | |
| 11 Sept. | Partly cloudy | 19° /12° | 0.7 mm | 5 | |
| 12 Sept. | Overcast | 17° /11° | 0.5 mm | 4 | |
| 13 Sept. | Overcast | 17° /10° | 0 mm | 5 | |
| 14 Sept. | Partly cloudy | 20° /11° | 0 mm | 6 | |
| 15 Sept. | Sunny | 22° /12° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 22° /13° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 21° /13° | 2.2 mm | 6 | |
| 18 Sept. | Light rain shower | 22° /12° | 3.5 mm | 5 | |
| 19 Sept. | Light rain | 20° /13° | 1.2 mm | 5 | |
| 20 Sept. | Moderate rain | 20° /13° | 9.3 mm | 5 | |
| 21 Sept. | Light rain shower | 21° /12° | 2.9 mm | 5 | |
| 22 Sept. | Patchy light drizzle | 18° /12° | 8.6 mm | 4 | |
| 23 Sept. | Partly cloudy | 17° /10° | 0.2 mm | 5 | |
| 24 Sept. | Cloudy | 18° /12° | 1.4 mm | 4 | |
| 25 Sept. | Overcast | 19° /12° | 1.6 mm | 5 | |
| 26 Sept. | Thundery outbreaks possible | 19° /12° | 5.5 mm | 5 | |
| 27 Sept. | Patchy rain possible | 16° /10° | 4.6 mm | 4 | |
| 28 Sept. | Overcast | 16° /9° | 0 mm | 4 | |
| 29 Sept. | Patchy rain possible | 16° /10° | 1.2 mm | 4 | |
| 30 Sept. | Cloudy | 17° /10° | 10 mm | 4 | |
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Important Notice
Our weather forecast for Harrow 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 Harrow forecast closer to your planned date for the most up-to-date weather information.
Harrow in September - FAQ
What are the expected maximum and minimum temperatures in Harrow during September?
During September, expect a variety of temperatures with highs around 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Harrow during September?
In September, Harrow can expect light to moderate rainfall, totaling 39 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Harrow during September?
The average wind speed in Harrow during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
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