Fog in Porto

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 38 hours of dense fog here (10-year average).

Measured at Francisco de Sá Carneiro Airport (LPPR). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LPPRFrancisco de Sá Carneiro Airport140 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 Porto fogs in

Fog here concentrates in August and September — about 140 hours in a typical year at LPPR, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LPPR station page.

Fog season

January: ~9 hJanFebruary: ~4 hFebMarch: ~3 hMarApril: ~4 hAprMay: ~7 hMayJune: ~9 hJunJuly: ~14 hJulAugust: ~38 hAugSeptember: ~22 hSepOctober: ~20 hOctNovember: ~5 hNovDecember: ~5 hDec
Fog season runs July through October, peaking in August; fog is mostly a 1 AM–9 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.