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Hourly Forecast
Daylight Hours
06:47
Sunrise
19:06
Sunset
Moon
Waxing Crescent
13:29
Moonrise
20:33
Moonset
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Weather in Grantham today, September 16, 2026
Expect a muted, overcast feel in Grantham on September 16, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Cloud leads the morning, peaking close to 89% near 10:00. Sunshine has little room until later in the day.
Temperatures climb from an overnight low near 11°C toward a daytime high of about 18°C. The air stays humid, with relative humidity between 58% and 95% and the peak around 07:00. Airflow remains manageable, reaching about 5.7 km/h around 10:00.
Through the afternoon wet weather remains a factor, with rain chances near 42% around 14:00. Cloud also stays substantial, close to 100% near 17:00. Visibility stays generally good near 30.4 km on average, though it can drop toward 3.5 km in thicker cloud or showers. Sunrise is at 06:47 and sunset at 19:06, giving 12 hours 19 minutes of sunlight today.
In short, treat September 16, 2026 in Grantham as a damp day: pack covers, watch the wetter hours, and expect a high near 18°C.
Frequently asked questions about weather in Grantham
How warm does it get in Grantham?
The warmest month in Grantham is July, with average high temperatures of 22°C. The average temperature during this period is around 18°C.
How cold does it get in Grantham?
The coldest month in Grantham is January, with average low temperatures of 2°C. The average temperature during this period is around 5°C.
What is the wettest time of year in Grantham?
The wettest month in Grantham is October, with an average of 77mm of precipitation.
What is the driest time of year in Grantham?
The driest month in Grantham is April, with an average of 44mm of precipitation.
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