SBGL — Rio Galeão – Tom Jobim International Airport

fog forecast & climatology · full 10-year analysis →
No fog forecast feed exists for this station. dense fog (visibility under a mile) is rare here in September (10-year average).

Fog hours per year
4 h below CAT I minima (2016–2026 average)
Fog season
July and June
Typical fog event
~1 h once it forms (middle half 1–2 h, n=30)
Data through
2026-08-15 · machine-readable data.json

When this airport fogs in

In a typical year Rio Galeão – Tom Jobim International Airport spends 4 hours below CAT I approach minima (visibility under ~½ mile or ceiling under 200 ft), concentrated in July and June. The strip above shows the hour-by-hour pattern for the current month from ten years of weather observations.

Fog season

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

For flight operations

EFVS crews: the CHASE board ranks airports by live fog status, approach lighting, go-around height and flight time from your base. Forecast probabilities publish here per-airport once the calibrated model beats climatology on live verification — receipts on the scorecard. Methodology.

Sources: NOAA/NWS National Blend of Models guidance · METAR observations 2016–2026 (Iowa Environmental Mesonet) · FAA NASR. Machine access: data.json · llms.txt. Not for operational use.