Weather in Cornwall, United Kingdom in September

So you're interested in going to Cornwall, United Kingdom in September

September is a slightly cold and slightly rainy time for sunbathing in Cornwall. September is a little too cold to enjoy swimming in Cornwall for any length of time. Consider visiting Cornwall in the months of June, July, August, September, for the best beach weather. Also consider one of our other suggestions for September.

Temperature in Cornwall in September

The average maximum temperature in Cornwall in September is 17°. The average maximum temperature is 19° in the previous month and 14° in the next month.

The average temperature in Cornwall in September is 14°. The average temperature ranges is 15° in the previous month and 12° in the next month.

The average minimum temperature in Cornwall in September is 11°. The minimum temperature is 13° in the previous month and in the next month.

Sunshine in Cornwall in September

The average day light hours per day in Cornwall in September are 12.7 and there are 5.1 hours of sunshine per day on average during September making it a sunny month that is overcast at times.

The ultraviolet index in Cornwall in September is typically 4 during September. An ultraviolet index reading of 3 to 5 indicates there is a moderate risk of harm from unprotected sun exposure. Keep out of the sun during the strongest hours around midday when unprotected skin risks burning in less than 30 minutes. For the sensitive wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days, and after swimming or sweating. Tanning for hours is possible with the right application of sun cream. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Cornwall in September

The average sea water temperature in Cornwall in September is 17.4° which is cool for swimming, shorty wetsuit may help you extend your time in the water.

Rainfall in Cornwall in September

The average total rainfall in Cornwall in September is 0.7cm and on average there are 12.1 rainy days in September making it a slightly wet time to visit the beach.

Humidity in Cornwall in September

The maximum dew point (an indicator of humidity) in Cornwall in September is 13° which is comfortable for everyone. The dew point is 14° in the previous month and 11° in the next month.

The average maximum relative humidity in Cornwall in September is typically 90%. The maximum relative humidity is 89.6% in the previous month and 90.5% in the next month.

The average relative humidity in Cornwall in September is typically 76.8%. The average relative humidity is 75.2% in the previous month and 79.7% in the next month.

Wind Speed in Cornwall in September

The average maximum wind speed in Cornwall in September is typically 28kmh. The average maximum wind speed is 28kmh in the previous month and 31kmh in the next month.

The average wind speed in Cornwall in September is typically 17kmh. The average wind speed is 17kmh in the previous month and 20kmh in the next month.

The average wind direction in Cornwall in September is from the West-Southwest.