London weather by month & the best time to visit
United Kingdom · major city break · oceanic / maritime climate
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The best time to visit London is September — its sunniest month (Sunshine Score 79/100), with June and July close behind. London averages about 1,592 hours of sunshine a year. Daytime highs around 20°C / 68°F and roughly 46 mm of rain in September.
When is the best time to visit London?
For sunshine, the best time to visit London is September, then June and July. The dullest month is January (0/100, 68 mm of rain). The full month-by-month picture is in the table below.
How sunny is London?
London isn't a sunny place by world standards: about 1,592 hours of sunshine a year. 79 Sunshine Score points separate September (79) from January (0), so the month you pick matters. It ranks #8 of 48 destinations in United Kingdom for annual sunshine, above the national median of 1,345 hours. The year's 736 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 7° / 45°F | 2° / 36°F | 68 mm | 0 |
| February | 0 | 8° / 46°F | 1° / 34°F | 56 mm | 1 |
| March | 13 | 10° / 50°F | 2° / 36°F | 52 mm | 2 |
| April | 40 | 14° / 57°F | 4° / 39°F | 44 mm | 3 |
| May | 58 | 17° / 63°F | 8° / 46°F | 57 mm | 4 |
| June | 77 | 21° / 70°F | 11° / 52°F | 58 mm | 5 |
| July | 77 | 23° / 73°F | 13° / 55°F | 60 mm | 5 |
| August | 75 | 23° / 73°F | 13° / 55°F | 67 mm | 4 |
| September | 79 | 20° / 68°F | 10° / 50°F | 46 mm | 3 |
| October | 43 | 15° / 59°F | 8° / 46°F | 77 mm | 2 |
| November | 18 | 11° / 52°F | 5° / 41°F | 77 mm | 1 |
| December | 0 | 8° / 46°F | 3° / 37°F | 74 mm | 0 |
Head-to-head
How London compares month by month: London vs Bournemouth · London vs Southampton · London vs Norwich · London vs Ostend · all comparisons
London: questions and answers
What kind of destination is London?
London is a major city break in United Kingdom with a oceanic / maritime climate.
How many hours of sunshine does London get a year?
London gets about 1,592 hours of sunshine a year, at its best around September.
When is the best time to visit London?
The sunniest time to visit London is September, when the Sunshine Score peaks at 79/100 (with June and July close behind). Expect daytime highs around 20°C / 68°F.
What is the least sunny month in London?
January is the least sunny month in London, scoring 0/100 with about 68 mm of rain.
How strong is the sun in London?
The typical midday UV index in London peaks around 5 (moderate) in June, easing to about 0 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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