Cornwall in September
The weather in September
In September, Cornwall averages daytime highs of 19° and night-time lows of 12° — mild weather by day. Expect around 107 mm of precipitation spread over about 10 wet days, with average cloud cover near 38%.
Days are 3.9° cooler than in August on average, and October is cooler again by about 5.9°. The sea averages 17°, too cold for most swimmers.
September scores 72/100 — good conditions for sightseeing — and ranks 1st of the twelve months for Cornwall.
Around the middle of the month the sun rises at 06:51 and sets at 19:26 local time, giving 12 h 35 min of daylight. Days shorten by 94 minutes over the month.
Why 72/100?
How the score for September is builtBeach score this month: 20/100 (adds sea temperature and heat).
Comfort peaks for daytime highs between 18° and 25°C (64–77°F).
Around Cornwall this month
Charlottetown
Summerside
Canada's best in September
Swift Current
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Cornwall in September: quick answers
Is September a good time to visit Cornwall?
September scores 72/100 for Cornwall, which we rate as good. Average highs are 19°C with 10 wet days.
How warm is Cornwall in September?
Daytime highs average 19°C and night-time lows 12°C in September.
Does it rain a lot in Cornwall in September?
Cornwall receives about 107 mm of precipitation in September, falling on around 10 days.
Can you swim in Cornwall in September?
The sea averages 17°C in September, cold for most swimmers.