Cornwall Weather in September

September in Cornwall averages 20°C (68°F) during the day and 12°C (54°F) at night. Quite a bit of rainfall is typical this month, with around 102 mm (4 in) on average. An umbrella is a good idea.

Rainfall in Cornwall in September

Records from the past 30 years suggest around 12 days of rain, with 102 mm (4 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Cornwall in September

If you're visiting Cornwall in September, expect highs of 20°C (68°F) and overnight lows around 12°C (54°F). September is typically considered a summer month. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Cornwall in September

The city usually sees around 183 hours of sunlight, indicating a moderately sunny period.

If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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Check the conditions for any month of the year.

• January
• February
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• May
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• October
• November
• December

For a detailed overview over the year and the best time to visit Canada, check out our Cornwall's climate page.

Cornwall Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 20°C (68°F)  

Chance of Rain 41%  

Precipitation 102 mm (4 in)  

Rainy days 12 days  

Sunshine 183 hours *  

Percentage Sunshine 48% *  

* Data from: Charlottetown, Canada (6 KM, 4 Miles).

What to Wear in Cornwall in September

For Cornwall in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Cornwall in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Canada, check out our Cornwall's climate page.

More climate data for Cornwall

Temperature Rainfall Sunshine

See the full Cornwall climate overview or explore weather in Canada.