St. Helens
September
Weather in St. Helens for September 2025
Your guide to St. Helens weather in September - trends and predictions
In general, the average temperature in St. Helens at the beginning of September is 22 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.7 °C by the end of September.
Expect significant rainfall in St. Helens during September, with an average of 18 rainy days.
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12
Dry days
18
Rainy days
0
Snow days
20°/13°
Temperatures
18 km/h
Avg max wind
76 %
Avg humidity
St. Helens in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  19° | 2  21° | 3  20° | 4  21° | 5 22° | 6 26° | 7 25° |
| 8 24° | 9 21° | 10 20° | 11 16° | 12  15° | 13 16° | 14 18° |
| 15  18° | 16 17° | 17  20° | 18 18° | 19 19° | 20 19° | 21 19° |
| 22 17° | 23 15° | 24 16° | 25 16° | 26 15° | 27 14° | 28 14° |
| 29 15° | 30 13° |
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Temperatures trend during September in St. Helens
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. | Light drizzle | 19° /13° | 3.3 mm | 5 | |
| 2 Sept. | Patchy rain possible | 21° /13° | 3.7 mm | 5 | |
| 3 Sept. | Overcast | 20° /13° | 0.1 mm | 5 | |
| 4 Sept. | Sunny | 21° /12° | 0.2 mm | 6 | |
| 5 Sept. | Sunny | 22° /13° | 0.4 mm | 6 | |
| 6 Sept. | Overcast | 26° /15° | 0 mm | 7 | |
| 7 Sept. | Patchy rain possible | 25° /17° | 1.2 mm | 6 | |
| 8 Sept. | Patchy rain possible | 24° /16° | 3 mm | 6 | |
| 9 Sept. | Patchy rain possible | 21° /14° | 1.4 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /13° | 4.2 mm | 5 | |
| 11 Sept. | Patchy rain possible | 16° /11° | 5.4 mm | 4 | |
| 12 Sept. | Cloudy | 15° /10° | 1.4 mm | 4 | |
| 13 Sept. | Overcast | 16° /8° | 0 mm | 4 | |
| 14 Sept. | Cloudy | 18° /11° | 0 mm | 4 | |
| 15 Sept. | Mist | 18° /12° | 0.6 mm | 5 | |
| 16 Sept. | Overcast | 17° /11° | 0.3 mm | 5 | |
| 17 Sept. | Moderate rain | 20° /12° | 4.9 mm | 6 | |
| 18 Sept. | Light rain shower | 18° /10° | 3.2 mm | 5 | |
| 19 Sept. | Light rain shower | 19° /11° | 4.8 mm | 5 | |
| 20 Sept. | Light rain shower | 19° /11° | 3.5 mm | 5 | |
| 21 Sept. | Patchy rain possible | 19° /10° | 1.6 mm | 5 | |
| 22 Sept. | Light rain shower | 17° /11° | 4 mm | 4 | |
| 23 Sept. | Patchy rain possible | 15° /11° | 2.7 mm | 4 | |
| 24 Sept. | Light drizzle | 16° /11° | 3.6 mm | 4 | |
| 25 Sept. | Cloudy | 16° /10° | 1.7 mm | 4 | |
| 26 Sept. | Light rain shower | 15° /10° | 14.7 mm | 4 | |
| 27 Sept. | Light rain shower | 14° /9° | 2.5 mm | 4 | |
| 28 Sept. | Light rain shower | 14° /9° | 1.5 mm | 4 | |
| 29 Sept. | Patchy rain possible | 15° /9° | 2.2 mm | 4 | |
| 30 Sept. | Light rain | 13° /10° | 14.2 mm | 3 | |
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Important Notice
Our weather forecast for St. Helens 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 St. Helens forecast closer to your planned date for the most up-to-date weather information.
St. Helens in September - FAQ
What are the expected maximum and minimum temperatures in St. Helens 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 St. Helens during September?
Moderate rainfall is anticipated in St. Helens during September, with a total of 74.7 mm spread over approximately 18 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in St. Helens during September?
The average wind speed in St. Helens during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
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