The best time to visit Cornwall
Month-by-month climate averages for Cornwall, Ontario, so you can pick your dates on data rather than guesswork.
The most comfortable time to visit Cornwall is usually May, June, August and September, when daytime highs sit in the pleasant 16-26°C range and the heaviest July rain is behind you.
Cornwall is warmest in July (highs near 25°C) and coldest in February (lows around -13°C), with roughly 1013 mm of precipitation across the year and July the wettest month. The sweet spot for most visitors is May, June, August and September. Expect overnight frost in January, February, March, November and December.
These are long-run averages. For the actual days you are travelling, check the live Cornwall forecast - and note how much the models agree, because that tells you how much to trust it.
Cornwall weather by month
what to expect in Cornwall through the year, 1991-2020 averagesHere is Cornwall's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Cornwall by season.