Fog in London

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 2 hours of dense fog here (10-year average).

Measured at London Gatwick Airport (EGKK). This station has climatology and live observations only.

Measuring stations

stationairportfog hours/yrforecast
EGKKLondon Gatwick Airport74 h/yrclimatology
EGLLLondon Heathrow Airport48 h/yrclimatology
EGKBLondon Biggin Hill Airport117 h/yrclimatology
EGLCLondon City Airport48 h/yrclimatology

Fog is measured where instruments live — airports. Hours/yr = time below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), the aviation definition of seriously dense fog.

When London fogs in

Fog here concentrates in December and November — about 74 hours in a typical year at EGKK, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EGKK station page.

Fog season

January: ~10 hJanFebruary: ~8 hFebMarch: ~7 hMarApril: ~2 hAprMay: ~3 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~2 hAugSeptember: ~2 hSepOctober: ~9 hOctNovember: ~11 hNovDecember: ~18 hDec
Fog season runs October through March, peaking in December; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 11 AM; a typical event lasts about 2 hours once it forms local time · 10-yr average

Machine access: data.json · llms.txt · forecast verification. Not for operational use.