Fog in Rio de Janeiro

daily fog outlook & 2016–2026 climatology
No fog forecast feed exists for this station. dense fog (visibility under a mile) is rare here in August (10-year average).

Measured at Santos Dumont Airport (SBRJ). This station has climatology and live observations only.

Measuring stations

stationairportfog hours/yrforecast
SBRJSantos Dumont Airport4 h/yrclimatology
SBSCSanta Cruz Air Force Base3 h/yrclimatology
SBAFCampo Délio Jardim de Mattos Airport2 h/yrclimatology
SBJRJacarepaguá - Roberto Marinho Airport2 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 Rio de Janeiro fogs in

Fog here concentrates in May and July — about 4 hours in a typical year at SBRJ. Hour-by-hour patterns, live conditions and the forecast strip live on the SBRJ station page.

Fog season

January: ~0 hJanFebruary: ~0 hFebMarch: ~1 hMarApril: ~0 hAprMay: ~1 hMayJune: ~0 hJunJuly: ~1 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~0 hOctNovember: ~0 hNovDecember: ~0 hDec
Rio de Janeiro has no real fog season — dense fog is rare in every month (under 2 hours even in the peak month).

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