Fog in San Jose

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. August typically brings about 1 hour of dense fog here (10-year average).

Measured at Tobías Bolaños International Airport (MRPV). This station has climatology and live observations only.

Measuring station

stationairportfog hours/yrforecast
MRPVTobías Bolaños International Airport12 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 San Jose fogs in

Fog here concentrates in June and November — about 12 hours in a typical year at MRPV, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the MRPV station page.

Fog season

January: ~0 hJanFebruary: ~0 hFebMarch: ~0 hMarApril: ~0 hAprMay: ~0 hMayJune: ~2 hJunJuly: ~0 hJulAugust: ~1 hAugSeptember: ~1 hSepOctober: ~1 hOctNovember: ~2 hNovDecember: ~0 hDec
Fog season is June, November, peaking in June; fog is mostly a 6 AM–6 AM phenomenon; typically thinning out by 8 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.