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Weather in Cornwall for September 2027

Your guide to Cornwall weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Cornwall at the beginning of September is 24.5 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.2 °C by the end of September.

    • Rain 🌧️

  • Cornwall experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 193.7 mm.

    • More

  • Is September a good time to visit Cornwall? check out the best time to travel to Cornwall page.

  • ✨ Is September a good time to visit Cornwall? – Ask the AI Weatherman

Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/11°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Cornwall Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Moderate rain
25°
2
Patchy rain possible
24°
3
Heavy rain
24°
4
Moderate rain
26°
5
Sunny
25°
6
Light rain
25°
7
Light rain
23°
8
Light rain
20°
9
Light rain
22°
10
Patchy rain possible
22°
11
Sunny
22°
12
Partly cloudy
24°
13
Light rain
21°
14
Fog
20°
15
Partly cloudy
23°
16
Overcast
24°
17
Overcast
24°
18
Fog
23°
19
Overcast
20°
20
Overcast
21°
21
Sunny
20°
22
Mist
20°
23
Patchy rain possible
20°
24
Fog
22°
25
Heavy rain
19°
26
Moderate rain
21°
27
Overcast
19°
28
Patchy rain possible
20°
29
Cloudy
21°
30
Mist
21°

Temperatures trend during September in Cornwall

See the weather trend as well as the moving average line

September weather in Cornwall day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Moderate rain
Moderate rain
 25° /11° 22.3 mm 5
2 Sept. Patchy rain possible
Patchy rain possible
 24° /13° 2.1 mm 5
3 Sept. Heavy rain
Heavy rain
 24° /14° 53.1 mm 5
4 Sept. Moderate rain
Moderate rain
 26° /15° 12.8 mm 6
5 Sept. Sunny
Sunny
 25° /13° 0.2 mm 6
6 Sept. Light rain
Light rain
 25° /15° 5.1 mm 6.7
7 Sept. Light rain
Light rain
 23° /12° 4.5 mm 6
8 Sept. Light rain
Light rain
 20° /11° 5.1 mm 4
9 Sept. Light rain
Light rain
 22° /9° 6.6 mm 4
10 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 1.1 mm 6
11 Sept. Sunny
Sunny
 22° /11° 0.6 mm 6
12 Sept. Partly cloudy
Partly cloudy
 24° /11° 0 mm 6
13 Sept. Light rain
Light rain
 21° /13° 5.8 mm 4
14 Sept. Fog
Fog
 20° /12° 0.7 mm 5
15 Sept. Partly cloudy
Partly cloudy
 23° /10° 0.1 mm 5
16 Sept. Overcast
Overcast
 24° /12° 0.1 mm 5
17 Sept. Overcast
Overcast
 24° /13° 0.3 mm 5
18 Sept. Fog
Fog
 23° /13° 0.2 mm 5.6
19 Sept. Overcast
Overcast
 20° /9° 0 mm 4
20 Sept. Overcast
Overcast
 21° /7° 0.1 mm 4
21 Sept. Sunny
Sunny
 20° /6° 0 mm 5
22 Sept. Mist
Mist
 20° /7° 0.2 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 1.8 mm 5
24 Sept. Fog
Fog
 22° /11° 0 mm 5
25 Sept. Heavy rain
Heavy rain
 19° /10° 50.9 mm 5
26 Sept. Moderate rain
Moderate rain
 21° /11° 18.4 mm 4
27 Sept. Overcast
Overcast
 19° /7° 0.2 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 1.4 mm 4
29 Sept. Cloudy
Cloudy
 21° /11° 0.1 mm 4.6
30 Sept. Mist
Mist
 21° /11° 0 mm 4
Next
Important Notice
Our weather forecast for Cornwall in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cornwall forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Cornwall in September - FAQ

What are the expected maximum and minimum temperatures in Cornwall during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Cornwall during September?
Significant rainfall exceeding 193.7 mm is expected in Cornwall during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Cornwall during September?
The average wind speed in Cornwall during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Cornwall

Explore the daily rainfall trends and prepare for Cornwalls September weather 💧
Typically, Cornwall has 6 rainy days in September with a total of 193.7 mm of rainfall.

UV exposure in Cornwall during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
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Location coordinates Where is Cornwall?

Get accurate weather forecasts for Cornwall, located at latitude 45.018 and longitude -74.728. Stay updated with localized weather information tailored for Cornwall.

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