Harrow Weather & Climate: Best Time to Visit

The climate in Harrow is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 23°C (73°F) in July to a chilly 9°C (48°F) in the coolest month, January.

Nights vary from 14°C (57°F) in July to around 3°C (37°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Harrow receives mid-range precipitation levels, with 717 mm (28 in) annually. Precipitation levels in Harrow remain relatively steady throughout the year. August has the most rain, with 67 mm (2.6 in) over 12 days. In the driest month March, this drops slightly to 48 mm (1.9 in), making the city's climate fairly predictable. For more details, please visit our Harrow Precipitation page.

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

The average number of days each month with precipitation

For those who appreciate different seasons, Harrow serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 7.3 hours of sunshine daily, and embrace the darker days in December, offering only 1.8 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Harrow.

The city experiences its highest humidity in November, reaching 81%. In April, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

The average wind speed over the year ranges from 3 m/s (6 knots) to 4 m/s (8 knots). It is lower in May, June, July, August, September, October and November and higher in January, February, March, April and December. What does this mean?

The mean monthly wind speed over the year (meters per second)