St. Helens
August
Weather in St. Helens for August 2025
Your guide to St. Helens weather in August - trends and predictions
In general, the average temperature in St. Helens at the beginning of August is 19 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 18 °C by the end of August.
St. Helens experiences an exceptionally high level of rainfall in August, with more than 24 rainy days on average.
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3
Dry days
28
Rainy days
0
Snow days
19°/13°
Temperatures
18 km/h
Avg max wind
77 %
Avg humidity
St. Helens in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2  20° | 3 19° | ||||
| 4 19° | 5 19° | 6 18° | 7 18° | 8 18° | 9  21° | 10 24° |
| 11 24° | 12  21° | 13 21° | 14 19° | 15 18° | 16 20° | 17 20° |
| 18 18° | 19 21° | 20 20° | 21 21° | 22 19° | 23 19° | 24 17° |
| 25 16° | 26 18° | 27 17° | 28 20° | 29 18° | 30 18° | 31  19° |
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Temperatures trend during August in St. Helens
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. | Patchy rain possible | 20° /13° | 1 mm | 5 | |
| 2 Aug. | Moderate or heavy rain shower | 20° /13° | 8.8 mm | 5 | |
| 3 Aug. | Patchy rain possible | 19° /12° | 0.3 mm | 4 | |
| 4 Aug. | Patchy rain possible | 19° /13° | 0.4 mm | 5 | |
| 5 Aug. | Moderate or heavy rain shower | 19° /11° | 12.2 mm | 4 | |
| 6 Aug. | Patchy rain possible | 18° /11° | 2.8 mm | 4 | |
| 7 Aug. | Patchy rain possible | 18° /12° | 1.4 mm | 4 | |
| 8 Aug. | Patchy rain possible | 18° /12° | 1.3 mm | 4 | |
| 9 Aug. | Overcast | 21° /12° | 0.3 mm | 5 | |
| 10 Aug. | Overcast | 24° /15° | 0.1 mm | 6 | |
| 11 Aug. | Overcast | 24° /14° | 0.4 mm | 6 | |
| 12 Aug. | Heavy rain at times | 21° /14° | 4.6 mm | 5 | |
| 13 Aug. | Patchy rain possible | 21° /13° | 3.8 mm | 5 | |
| 14 Aug. | Moderate or heavy rain shower | 19° /12° | 7.7 mm | 5 | |
| 15 Aug. | Patchy rain possible | 18° /12° | 3 mm | 4 | |
| 16 Aug. | Patchy rain possible | 20° /11° | 0.3 mm | 5 | |
| 17 Aug. | Patchy rain possible | 20° /13° | 0.1 mm | 5 | |
| 18 Aug. | Heavy rain at times | 18° /13° | 2 mm | 4 | |
| 19 Aug. | Patchy rain possible | 21° /13° | 4.9 mm | 5 | |
| 20 Aug. | Patchy rain possible | 20° /12° | 3.2 mm | 5 | |
| 21 Aug. | Patchy rain possible | 21° /12° | 1 mm | 5 | |
| 22 Aug. | Patchy rain possible | 19° /14° | 2.1 mm | 5 | |
| 23 Aug. | Patchy rain possible | 19° /13° | 3.1 mm | 5 | |
| 24 Aug. | Patchy rain possible | 17° /12° | 0.9 mm | 4 | |
| 25 Aug. | Light rain shower | 16° /10° | 4 mm | 4 | |
| 26 Aug. | Moderate or heavy rain shower | 18° /12° | 6.5 mm | 4 | |
| 27 Aug. | Light rain shower | 17° /12° | 5.8 mm | 4 | |
| 28 Aug. | Light rain shower | 20° /12° | 1 mm | 5 | |
| 29 Aug. | Light rain shower | 18° /11° | 0.8 mm | 4 | |
| 30 Aug. | Light rain shower | 18° /11° | 0.9 mm | 5 | |
| 31 Aug. | Light rain | 19° /11° | 1.4 mm | 5 | |
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Important Notice
Our weather forecast for St. Helens in August 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 August - FAQ
What are the expected maximum and minimum temperatures in St. Helens during August?
Enjoy moderate daytime temperatures of up to 19° 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 August?
Significant rainfall exceeding 117.9 mm is expected in St. Helens during August, occurring over more than 28 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in St. Helens during August?
The average wind speed in St. Helens during August is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
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