Grantham Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to chilly in Grantham. Average daytime temperatures reach a comfortable 23°C (73°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 8°C (46°F).

At night, temperatures range from around 13°C (55°F) in July to 2°C (36°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Grantham has a moderate amount of precipitation, averaging 732 mm (29 in) of rain/snowfall annually. Despite minor fluctuations, Grantham enjoys fairly consistent precipitation throughout the year. In June, you can expect around 74 mm (2.9 in) of precipitation, while in February, Grantham receives about 48 mm (1.9 in). For more details, please visit our Grantham Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Grantham can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.8 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The city experiences its highest humidity in December, reaching 90%. In July, the humidity drops to its lowest level at 78%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year