Cornwall Weather in September

In Cornwall, September brings high daytime temperatures around 22°C (72°F), with nights cooling to 11°C (52°F). Expect quite a bit of rainfall this month.

Rainfall in Cornwall in September

Historically, September sees about 12 days of rain, with a monthly average of 86 mm (3.4 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Cornwall in September

The perfect temperature in Cornwall in September makes it a solid month to visit, with 22°C (72°F) during the day and 11°C (52°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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.

Cornwall Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 22°C (72°F)  

Chance of Rain 39%  

Precipitation 86 mm (3.4 in)  

Rainy days 12 days  

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.

What To Do in Cornwall in September

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

Cycling

9/10

Walking

9/10

Camping

8/10

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

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