Fog in Turku

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 20 hours of dense fog here (10-year average).

Measured at Turku Airport (EFTU). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
EFTUTurku Airport221 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 Turku fogs in

Fog here concentrates in January and February — about 221 hours in a typical year at EFTU, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the EFTU station page.

Fog season

January: ~30 hJanFebruary: ~27 hFebMarch: ~29 hMarApril: ~11 hAprMay: ~9 hMayJune: ~4 hJunJuly: ~7 hJulAugust: ~20 hAugSeptember: ~18 hSepOctober: ~19 hOctNovember: ~20 hNovDecember: ~28 hDec
Fog season runs August through May, peaking in January; fog is mostly a midnight–10 AM phenomenon; typically thinning out by 4 PM; a typical event lasts about 1 hour once it forms local time · 10-yr average

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