Fog in Oak Harbor, WA

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 9%). August typically brings about 14 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Whidbey Island Naval Air Station (Ault Field) (KNUW). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KNUWWhidbey Island Naval Air Station (Ault Field)77 h/yrlive forecast

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 Oak Harbor fogs in

Fog here concentrates in September and August — about 77 hours in a typical year at KNUW, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KNUW station page.

Fog season

January: ~7 hJanFebruary: ~4 hFebMarch: ~3 hMarApril: ~2 hAprMay: ~5 hMayJune: ~3 hJunJuly: ~5 hJulAugust: ~14 hAugSeptember: ~13 hSepOctober: ~10 hOctNovember: ~4 hNovDecember: ~9 hDec
Fog season is January, February, May, July, August, September, October, November, December, peaking in August; fog is mostly a 4 AM–8 AM phenomenon; typically thinning out by 10 AM; a typical event lasts about 2 hours once it forms local time · 10-yr average

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