Cornwall in september: average Weather, Temperature and Climate
Weather in Cornwall in september 2025
The weather in Cornwall in september comes from statistical datas on the last years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
59°F
Partly Cloudy
29% of time
26%
21%
18%
Weather at 12pm
63°F
Clear/Sunny
29% of time
26%
20%
19%
Weather at 6pm
61°F
Clear/Sunny
33% of time
28%
18%
17%
Weather at 3am
59°F
28%
26%
22%
17%
Evolution of daily average temperature and precipitation in Cornwall in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Cornwall in september.
The climate of Cornwall in september is good
In september in Cornwall, the climate is wet (with 3.1in of precipitation over 5 days). This is better than the previous month since in august it receives an average of 4.7in of precipitation over 7 days.
The climate is relatively cold around this city this month, but it is endurable by dressing hot. The thermometer averaged maximum of 63°F. On average, the recorded minimum temperature is 59°F. Thus, the mean temperature average on this month of september in Cornwall is 61°F. These temperatures are far removed from those records observed in Cornwall in september with a maximum record of 74°F in 2020 and a minimum record of 49°F in 2009. You can hope to have about 10 days with temperatures up to 65°F, or 33% of time.
On this month of september, day length in Cornwall is generally 12:37. The sun rises at 05:56 and sunset is at 18:33.
With good weather conditions, this month is advisable to go in that area in England.
Seasonal average climate and temperature of Cornwall in september
Check below seasonal norms These statistics are set from the weather statements earlier years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 61°F | ||||
| Highest temperature | 63°F | ||||
| Lowest temperature | 59°F | ||||
| Highest record temperature | 74°F (2020) | ||||
| Lowest record temperature | 49°F (2009) | ||||
| Number of days at +65°F | 10 day(s) (33%) | ||||
| Sea temperature | |||||
| Average sea temperature | 62°F | ||||
| Lowest sea temperature | 59°F | ||||
| Highest sea temperature | 65°F | ||||
| Wind | |||||
| Wind speed | 26km/h | ||||
| Wind temperature | 58°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.1in | ||||
| Number of days with rainfall | 5 day(s) (17%) | ||||
| Record daily rainfall | 1.9in (2012) | ||||
| Other climate data | |||||
| Humidity | 87% | ||||
| Visibility | 9.29km | ||||
| Cloud cover | 46% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:56 | ||||
| Time of sunset | 18:33 | ||||
| Length of day | 12:37 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Cornwall in september 2024:
59°F to 67°F
59°F to 63°F
58°F to 61°F
58°F to 59°F
56°F to 61°F
59°F to 61°F
58°F to 63°F
61°F to 63°F
58°F to 59°F
59°F to 61°F
56°F to 58°F
54°F to 56°F
54°F to 59°F
52°F to 61°F
56°F to 61°F
58°F to 65°F
54°F to 63°F
56°F to 67°F
59°F to 68°F
59°F to 67°F
58°F to 63°F
59°F to 63°F
59°F to 61°F
58°F to 61°F
56°F to 61°F
54°F to 59°F
52°F to 56°F
52°F to 56°F
54°F to 59°F
56°F to 59°F
Map: other cities in England in september
Cities near Cornwall:
| Falmouth in september | good weather |
| Penzance in september | good weather |
| Plymouth in september | good weather |
| Salcombe in september | good weather |
| Clovelly in september | good weather |
| Isles of Scilly in september | good weather |
| Paignton in september | good weather |
| Torquay in september | good weather |
| Barnstaple in september | good weather |
| Exeter in september | good weather |
| Exmouth in september | good weather |
| Exmoor National Park in september | good weather |
Click over cities on the map for information about the weather in september.
Cornwall
perfect weather
good
tolerable
bad
very bad
Weather data for Cornwall in september:
Weather data for Cornwall for september are derived from an average of the weather forecast since 2009 in Cornwall. There is a margin of error and these forecasts are to be considered as general information only. The weather in Cornwall can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Cornwall.