St. Helens
May
Weather in St. Helens for May 2025
Your guide to St. Helens weather in May - trends and predictions
In general, the average temperature in St. Helens at the beginning of May is 15.6 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 17.3 °C by the end of May.
The climate of St. Helens in May is notably wet, with an average of 11 rainy days.
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20
Dry days
11
Rainy days
0
Snow days
18°/8°
Temperatures
15 km/h
Avg max wind
75 %
Avg humidity
St. Helens in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 16° | 3  13° | 4 14° | |||
| 5 18° | 6  15° | 7 17° | 8 17° | 9 16° | 10 18° | 11 18° |
| 12 20° | 13  19° | 14 17° | 15 15° | 16 16° | 17 14° | 18 17° |
| 19 18° | 20 19° | 21 19° | 22 15° | 23 13° | 24  14° | 25 18° |
| 26 17° | 27 17° | 28 15° | 29  17° | 30 18° | 31 19° |
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Temperatures trend during May in St. Helens
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May | Patchy rain possible | 16° /8° | 1.1 mm | 4 | |
| 2 May | Patchy rain possible | 16° /9° | 0.2 mm | 4 | |
| 3 May | Overcast | 13° /8° | 4.1 mm | 3 | |
| 4 May | Patchy rain possible | 14° /7° | 6.4 mm | 4 | |
| 5 May | Patchy rain possible | 18° /9° | 3.2 mm | 4 | |
| 6 May | Moderate or heavy rain shower | 15° /9° | 5.2 mm | 4 | |
| 7 May | Overcast | 17° /9° | 0.6 mm | 4 | |
| 8 May | Moderate or heavy rain shower | 17° /10° | 6.1 mm | 4 | |
| 9 May | Patchy rain possible | 16° /10° | 0.8 mm | 4 | |
| 10 May | Moderate or heavy rain shower | 18° /9° | 3.2 mm | 4 | |
| 11 May | Moderate rain at times | 18° /11° | 2.6 mm | 5 | |
| 12 May | Patchy rain possible | 20° /10° | 3.8 mm | 5 | |
| 13 May | Cloudy | 19° /9° | 1.7 mm | 4 | |
| 14 May | Patchy rain possible | 17° /10° | 8.3 mm | 4 | |
| 15 May | Patchy rain possible | 15° /9° | 1.6 mm | 4 | |
| 16 May | Patchy rain possible | 16° /8° | 3.6 mm | 4 | |
| 17 May | Patchy rain possible | 14° /9° | 1 mm | 3 | |
| 18 May | Overcast | 17° /11° | 1.3 mm | 4 | |
| 19 May | Patchy rain possible | 18° /9° | 1 mm | 5 | |
| 20 May | Overcast | 19° /9° | 0.3 mm | 4 | |
| 21 May | Cloudy | 19° /8° | 3.6 mm | 4 | |
| 22 May | Cloudy | 15° /9° | 3.6 mm | 4 | |
| 23 May | Patchy rain possible | 13° /9° | 4.6 mm | 4 | |
| 24 May | Partly cloudy | 14° /9° | 0.3 mm | 4 | |
| 25 May | Patchy rain possible | 18° /8° | 0.4 mm | 4 | |
| 26 May | Cloudy | 17° /8° | 2.5 mm | 4 | |
| 27 May | Partly cloudy | 17° /9° | 1.4 mm | 5 | |
| 28 May | Patchy rain possible | 15° /8° | 1.6 mm | 4 | |
| 29 May | Sunny | 17° /8° | 0.4 mm | 5 | |
| 30 May | Sunny | 18° /8° | 2.1 mm | 5 | |
| 31 May | Sunny | 19° /9° | 0.2 mm | 5 | |
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Important Notice
Our weather forecast for St. Helens in May 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 May - FAQ
What are the expected maximum and minimum temperatures in St. Helens during May?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in St. Helens during May?
Significant rainfall exceeding 136.8 mm is expected in St. Helens during May, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in St. Helens during May?
The average wind speed in St. Helens during May is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
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