Normal weather in St. Helens in August
The weather in St. Helens in August has an average temperature of around 21°C during the day. On average, August sees 61 mm of rain in St. Helens. The wind speed is 3 Beaufort and mainly comes from Southwest.
After July, August in St. Helens starts with a temperature of 21°C and ends around September at 19°C.
August averages for St. Helens
![]() | 21°C |
![]() | 22°C |
![]() | 19°C |
![]() | 61 mm |
![]() | 15 days |
Temperature per day in August in St. Helens
This graph shows the average daily maximum temperatures in August in St. Helens, indicated in degrees Celsius.
Precipitation per day in August in St. Helens
This graph shows the average daily precipitation in August in St. Helens, indicated in millimeters.
UV index per day in August in St. Helens
This graph shows the average daily UV index in August in St. Helens.
Yearly temperature in August in St. Helens
This graph shows the average yearly temperature in August in St. Helens, measured in degrees Celsius, over the past years.
Yearly total precipitation in August in St. Helens
This graph shows the average yearly precipitation in millimeters in August in St. Helens, over the past years.
Average daily weather in August
Click on a day to get more information about the average weather on that day.
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Average weather in St. Helens per month
Click on a month below to see in detail how the weather typically is in St. Helens and what to expect. Based on the historical weather data of St. Helens, you can view the average temperature, precipitation, wind, and UV index for each day of the month.