Fog in San Bernardino, CA

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. dense fog (visibility under a mile) is rare here in August.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at San Bernardino International Airport (KSBD). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KSBDSan Bernardino International Airport3 h/yrverifying

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 Bernardino fogs in

Fog here concentrates in December and February — about 3 hours in a typical year at KSBD. Hour-by-hour patterns, live conditions and the forecast strip live on the KSBD station page.

Fog season

January: ~0 hJanFebruary: ~1 hFebMarch: ~0 hMarApril: ~0 hAprMay: ~0 hMayJune: ~0 hJunJuly: ~0 hJulAugust: ~0 hAugSeptember: ~0 hSepOctober: ~0 hOctNovember: ~1 hNovDecember: ~2 hDec
Fog season is December, peaking in December; fog is mostly a 6 AM–7 AM phenomenon; typically thinning out by 9 AM local time · 10-yr average

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