Normal weather in Cornwall in September
The weather in Cornwall in September has an average temperature of around 18°C during the day. On average, September sees 82 mm of rain in Cornwall. The wind speed is 4 Beaufort and mainly comes from South.
After August, September in Cornwall starts with a temperature of 18°C and ends around October at 16°C.
September averages for Cornwall
 Average temperature | 18°C |
 Highest daytime temperature | 20°C |
| Lowest daytime temperature | 16°C |
 Total rainfall | 82 mm |
| Rainy days | 12 days |
Temperature per day in September in Cornwall
This graph shows the average daily maximum temperatures in September in Cornwall, indicated in degrees Celsius.
Precipitation per day in September in Cornwall
This graph shows the average daily precipitation in September in Cornwall, indicated in millimeters.
UV index per day in September in Cornwall
This graph shows the average daily UV index in September in Cornwall.
Yearly temperature in September in Cornwall
This graph shows the average yearly temperature in September in Cornwall, measured in degrees Celsius, over the past years.
Yearly total precipitation in September in Cornwall
This graph shows the average yearly precipitation in millimeters in September in Cornwall, 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 Cornwall per month
Click on a month below to see in detail how the weather typically is in Cornwall and what to expect. Based on the historical weather data of Cornwall, you can view the average temperature, precipitation, wind, and UV index for each day of the month.