Fog in Sintra

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 4 hours of dense fog here (10-year average).

Measured at Sintra Air Base (LPST). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
LPSTSintra Air Base57 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 Sintra fogs in

Fog here concentrates in January and September — about 57 hours in a typical year at LPST, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the LPST station page.

Fog season

January: ~6 hJanFebruary: ~3 hFebMarch: ~0 hMarApril: ~3 hAprMay: ~4 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~4 hAugSeptember: ~5 hSepOctober: ~3 hOctNovember: ~2 hNovDecember: ~3 hDec
Fog season is January, February, April, May, August, September, October, November, December, peaking in January; fog is mostly a 7 AM–8 AM phenomenon; typically thinning out by 10 AM; 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.