Fog in San Luis Obispo, CA

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 3 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at San Luis County Regional Airport (KSBP). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KSBPSan Luis County Regional Airport95 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 Luis Obispo fogs in

Fog here concentrates in October and November — about 95 hours in a typical year at KSBP, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KSBP station page.

Fog season

January: ~7 hJanFebruary: ~9 hFebMarch: ~7 hMarApril: ~6 hAprMay: ~4 hMayJune: ~2 hJunJuly: ~3 hJulAugust: ~3 hAugSeptember: ~10 hSepOctober: ~17 hOctNovember: ~16 hNovDecember: ~13 hDec
Fog season runs September through April, peaking in October; fog is mostly a 10 PM–7 AM phenomenon; typically thinning out by 9 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.