Fog in Arlington, WA

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 8%). August typically brings about 4 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Arlington Municipal Airport (KAWO). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KAWOArlington Municipal Airport154 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 Arlington fogs in

Fog here concentrates in October and December — about 154 hours in a typical year at KAWO, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KAWO station page.

Fog season

January: ~26 hJanFebruary: ~15 hFebMarch: ~5 hMarApril: ~2 hAprMay: ~3 hMayJune: ~1 hJunJuly: ~2 hJulAugust: ~4 hAugSeptember: ~17 hSepOctober: ~34 hOctNovember: ~18 hNovDecember: ~30 hDec
Fog season runs September through February, peaking in October; fog is mostly a 10 PM–8 AM phenomenon; typically thinning out by 10 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.