Climate & Weather in London (2026)

Updated July 2026 · Sources cited: en.wikipedia.org, climatestotravel.com

Prepare for rain year-round—London receives about 370 mm annually but distributed fairly evenly, making umbrella and waterproof layer essential any time of year
Late May through early September (especially May–June and September–October) offers the best balance of warm weather, lower rainfall, and fewer crowds than peak summer
Winter (November–February) is the least preferred visiting period: cold, grey, limited daylight (under 9 hours daily), and frequent rain; however, occasional snow and holiday festive lighting may appeal to some travelers
Daylight varies dramatically: up to 16.5 hours in June versus under 8 hours in December, affecting activity planning and mood
Snow is unpredictable and typically doesn't accumulate in central London due to urban warmth, though light flurries or wet sleet may occur in winter
Spring (March–May) and autumn (September–October) provide mild temperatures (10–20°C (50–68°F)) and manageable rainfall, with spring seeing fresh blooms and autumn offering golden foliage
Summer is mild rather than hot (peaks around 23°C (73°F)); rarely stifling, allowing comfortable daytime exploration, though always bring a light layer for cool evenings (13–14°C (57°F))

Distribution: Fairly evenly distributed year-round; slight peaks in autumn and early summer
Driest Month: March (48 mm)
Wettest Month: November (68 mm)
Annual Total Mm: 370
Annual Rainfall Days: 151.7
Note: Heaviest rainfall often occurs June-September and November

Frequency: Infrequent; falls on average 16 days per year (7.7-16 days depending on source)
Accumulation: Rarely accumulates significantly; urban heat island effect causes rapid melting
Typical Months: December to February, occasionally March
Depth When Accumulates Mm: 50
Note: Snow falls as wet sleet more often than dry powder; rarely creates lasting ground cover

Months: June to August
Temperature Low Celsius: 14
Temperature High Celsius: 23
Temperature Low Fahrenheit: 57
Temperature High Fahrenheit: 73
Description: Short, comfortable summers with frequent rain; long daylight hours

Temperate oceanic (Köppen Cfb) with cool winters and mild summers

AI-generated estimateData refreshed July 2026

These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.

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Data last updated July 2026 · Verify anything important.