Fog in Friday Harbor, WA

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 9 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Friday Harbor Airport (KFHR). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KFHRFriday Harbor Airport47 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 Friday Harbor fogs in

Fog here concentrates in September and August — about 47 hours in a typical year at KFHR, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KFHR station page.

Fog season

January: ~2 hJanFebruary: ~2 hFebMarch: ~2 hMarApril: ~1 hAprMay: ~3 hMayJune: ~1 hJunJuly: ~4 hJulAugust: ~9 hAugSeptember: ~14 hSepOctober: ~7 hOctNovember: ~1 hNovDecember: ~2 hDec
Fog season runs July through October, peaking in September; fog is mostly a 5 AM–8 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.