Normal weather in St. Helens in September
The weather in St. Helens in September has an average temperature of around 19°C during the day. On average, September sees 56 mm of rain in St. Helens. The wind speed is 3 Beaufort and mainly comes from Southwest.
After August, September in St. Helens starts with a temperature of 19°C and ends around October at 16°C.
September averages for St. Helens
Average temperature | 19°C |
Highest daytime temperature | 21°C |
Lowest daytime temperature | 16°C |
Total rainfall | 56 mm |
Rainy days | 13 days |
Temperature per day in September in St. Helens
This graph shows the average daily maximum temperatures in September in St. Helens, indicated in degrees Celsius.
Precipitation per day in September in St. Helens
This graph shows the average daily precipitation in September in St. Helens, indicated in millimeters.
UV index per day in September in St. Helens
This graph shows the average daily UV index in September in St. Helens.
Yearly temperature in September in St. Helens
This graph shows the average yearly temperature in September in St. Helens, measured in degrees Celsius, over the past years.
Yearly total precipitation in September in St. Helens
This graph shows the average yearly precipitation in millimeters in September in St. Helens, over the past years.
Average daily weather in September
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.