Grantham Weather in September
What's the weather like in Grantham (England) in September 2025?
The climate in Grantham during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Grantham and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 9°C (48°F) is normal.
| Daytime temperature | 18°C 64.4°F |
|---|---|
| Nightly temperature | 9°C 48.2°F |
| Average temperature | 13.5°C 56.3°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 49 mm 1.9 ins |
| Rainy days | 12 days |
| Sea temperature | 15.5°C 59.9°F |
| Humidity | 84% |
| Windspeed | 15.8kph 10 mph |
On average September is the 3rd driest month of the year in Grantham with around 49mm 1.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
September temperatures in Grantham
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grantham in September 2025.
Other monthly averages
Best places to visit in September
Grantham weather stats
| Hottest month: | July | 20.5°C 68.9°F |
|---|---|---|
| Driest month: | February | 41mm 1.6ins |
| Sunniest month: | June | 7.1hrs |
| Coldest month: | January | 5.8°C 42.4°F |
| Wettest month: | August | 62mm 2.4ins |
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