Cornwall in May
The weather in May
In May, Cornwall averages daytime highs of 14° and night-time lows of 6° — cool weather by day. Expect around 97 mm of precipitation spread over about 14 wet days, with average cloud cover near 45%.
Days are 6.7° warmer than in April on average, and June is warmer again by about 5.4°. The sea averages 5°, too cold for most swimmers.
May scores 38/100 — mixed conditions for sightseeing — and ranks 5th of the twelve months for Cornwall. For the most comfortable weather, consider July, August and September instead.
Around the middle of the month the sun rises at 05:41 and sets at 20:39 local time, giving 14 h 58 min of daylight. Days lengthen by 69 minutes over the month.
Why 38/100?
How the score for May is builtBeach score this month: 11/100 (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 May
Whitchurch–Stouffville
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Cornwall in May: quick answers
Is May a good time to visit Cornwall?
May scores 38/100 for Cornwall, which we rate as mixed. Average highs are 14°C with 14 wet days.
How warm is Cornwall in May?
Daytime highs average 14°C and night-time lows 6°C in May.
Does it rain a lot in Cornwall in May?
Cornwall receives about 97 mm of precipitation in May, falling on around 14 days.
Can you swim in Cornwall in May?
The sea averages 5°C in May, cold for most swimmers.