Heathrow Weather & Climate: Best Time to Visit

Visitors to Heathrow can expect significant temperature changes throughout the year. On average, daytime temperatures range from a comfortable 23°C (73°F) in July to a chilly 9°C (48°F) in January.

Nighttime temperatures range from 14°C (57°F) in July to 3°C (37°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Heathrow experiences moderate precipitation patterns, averaging 718 mm (28 in) yearly. The wettest period in Heathrow occurs in November, which receives around 68 mm (2.7 in) of precipitation. During the driest month, March, Heathrow experiences moderate rainfall, totaling 48 mm (1.9 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Heathrow Precipitation page.

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

The average number of days each month with precipitation

In Heathrow, summer days are longer and more sunny, with daily sunshine hours peaking at 7.3 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.8 hours per average day.

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 Heathrow.

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 mean wind speed varies between 3 m/s (6 knots) and 4 m/s (8 knots) throughout the year. It is lowest in May, June, July, August, September, October and November and highest during January, February, March, April and December. What does this mean?

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