Normal weather in Alton in September
The weather in Alton in September has an average temperature of around 18°C during the day. On average, September sees 63 mm of rain in Alton. The wind speed is 4 Beaufort and mainly comes from South.
After August, September in Alton starts with a temperature of 18°C and ends around October at 15°C.
September averages for Alton
 Average temperature | 18°C |
 Highest daytime temperature | 20°C |
| Lowest daytime temperature | 15°C |
 Total rainfall | 63 mm |
| Rainy days | 14 days |
Temperature per day in September in Alton
This graph shows the average daily maximum temperatures in September in Alton, indicated in degrees Celsius.
Precipitation per day in September in Alton
This graph shows the average daily precipitation in September in Alton, indicated in millimeters.
UV index per day in September in Alton
This graph shows the average daily UV index in September in Alton.
Yearly temperature in September in Alton
This graph shows the average yearly temperature in September in Alton, measured in degrees Celsius, over the past years.
Yearly total precipitation in September in Alton
This graph shows the average yearly precipitation in millimeters in September in Alton, 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 Alton per month
Click on a month below to see in detail how the weather typically is in Alton and what to expect. Based on the historical weather data of Alton, you can view the average temperature, precipitation, wind, and UV index for each day of the month.