See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
17°
Clear
Feels Like: 18°
Min: 14°
Max: 22°
The next few hours will be overcast, with tomorrow reaching 19°C and dropping to 13°C. The coming days will be mostly cloudy
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:44
Sunrise
19:07
Sunset
Moon
Waxing Crescent
12:04
Moonrise
20:16
Moonset
Daily Forecast
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Wednesday
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Thursday
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Weather in Harrow tomorrow, September 16, 2026
Cloud cover dominates in Harrow on September 16, 2026, keeping sunshine limited. Expect a grey, overcast feel rather than long bright spells. Expect a grey start, with morning cloud around 70% by 10:00. Outdoor plans early on should not rely on bright skies.
Temperatures climb from an overnight low near 11°C toward a daytime high of about 19°C. Relative humidity sits between 49% and 93%, reaching its peak around 06:00. Winds stay light, near 4.1 km/h by 13:00, so the day feels still more than breezy.
Expect persistent cloud later on, with amounts around 100% by 17:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 31.3 km on average, though it can drop toward 16.5 km in thicker cloud or showers. The sun rises at 06:46 and sets at 19:04, for a total of 12 hours 18 minutes of sunlight today.
Overall, Harrow on September 16, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 19°C.
Frequently asked questions about weather in Harrow
How warm does it get in Harrow?
The warmest month in Harrow 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 Harrow?
The coldest month in Harrow 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 Harrow?
The wettest month in Harrow is October, with an average of 74mm of precipitation.
What is the driest time of year in Harrow?
The driest month in Harrow is April, with an average of 43mm of precipitation.
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