St. Helens (St Helens)
September
Weather in St. Helens for September 2026
Your guide to St. Helens weather in September - trends and predictions
Until now, September 2026 in St. Helens is slightly cooler than the historical average by 1.9 °C.
Expect cooler weather in the next days in St. Helens with the forecast suggesting a temperature of 17.9 °C, lower than the historical average.
In general, the average temperature in St. Helens at the beginning of September is 21 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °C by the end of September.
St. Helens experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 95.2 mm.
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Temperatures
Rain 🌧️
More
3
Dry days
27
Rainy days
0
Snow days
18°/11°
Temperatures
18 km/h
Avg max wind
74 %
Avg humidity
St. Helens Weather September
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Temperatures trend during September in St. Helens
See the weather trend as well as the moving average line
September weather in St. Helens day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 20° /12° | 3.2 mm | 4 | |
| 2 Sept. | Patchy rain possible | 20° /12° | 2.8 mm | 4 | |
| 3 Sept. | Patchy rain possible | 20° /13° | 7.3 mm | 4 | |
| 4 Sept. | Patchy rain possible | 20° /12° | 3.2 mm | 4 | |
| 5 Sept. | Patchy rain possible | 20° /13° | 0.5 mm | 4 | |
| 6 Sept. |  Overcast | 24° /13° | 0.9 mm | 5 | |
| 7 Sept. | Patchy rain possible | 23° /15° | 2 mm | 4 | |
| 8 Sept. | Patchy rain possible | 21° /13° | 2.8 mm | 4 | |
| 9 Sept. | Patchy rain possible | 20° /12° | 1.1 mm | 4 | |
| 10 Sept. | Light rain shower | 19° /12° | 3.4 mm | 4 | |
| 11 Sept. | Patchy rain possible | 16° /11° | 4.8 mm | 3 | |
| 12 Sept. |  Cloudy | 17° /10° | 3.5 mm | 3 | |
| 13 Sept. | Patchy rain possible | 17° /9° | 3.5 mm | 3 | |
| 14 Sept. | Overcast | 22° /15° | 0.1 mm | 3.7 | |
| 15 Sept. | Patchy rain possible | 19° /13° | 5.8 mm | 2.5 | |
| 16 Sept. | Patchy rain possible | 15° /12° | 3.2 mm | 1.6 | |
| 17 Sept. | Patchy rain possible | 15° /13° | 2.1 mm | 4 | |
| 18 Sept. | Patchy rain possible | 17° /12° | 1 mm | 4 | |
| 19 Sept. | Patchy rain possible | 16° /13° | 1.2 mm | 4 | |
| 20 Sept. | Patchy rain possible | 21° /12° | 0.4 mm | 6 | |
| 21 Sept. |  Sunny | 18° /12° | 6.8 mm | 4 | |
| 22 Sept. | Patchy rain possible | 15° /12° | 0.3 mm | 3 | |
| 23 Sept. | Overcast | 15° /12° | 0 mm | 4 | |
| 24 Sept. | Sunny | 16° /11° | 0 mm | 5 | |
| 25 Sept. |  Partly cloudy | 21° /11° | 0 mm | 6 | |
| 26 Sept. | Sunny | 21° /11° | 0 mm | 6 | |
| 27 Sept. | Sunny | 19° /10° | 3.9 mm | 5 | |
| 28 Sept. | Patchy rain possible | 15° /9° | 1 mm | 4 | |
| 29 Sept. | Patchy rain possible | 15° /9° | 1.5 mm | 3 | |
| 30 Sept. |  Light rain | 15° /10° | 9.5 mm | 3 | |
| Next | |||||
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.
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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 18° and cooler nights around 11°. 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 95.2 mm spread over approximately 27 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.
September rainfall patterns in St. Helens
Explore the daily rainfall trends and prepare for St. Helenss September weather 💧
Typically, St. Helens has 27 rainy days in September with a total of 95.2 mm of rainfall.
UV exposure in St. Helens during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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