Fog in Tacoma, WA

daily fog outlook & 2016–2026 climatology
Fog unlikely through Monday (peak 3%). August typically brings about 2 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Tacoma Narrows Airport (KTIW). Forecast percentages for this station have passed live verification.

Measuring stations

stationairportfog hours/yrforecast
KTIWTacoma Narrows Airport114 h/yrlive forecast
KTCMMcChord Air Force Base100 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 Tacoma fogs in

Fog here concentrates in January and October — about 114 hours in a typical year at KTIW, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KTIW station page.

Fog season

January: ~29 hJanFebruary: ~8 hFebMarch: ~6 hMarApril: ~1 hAprMay: ~3 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~2 hAugSeptember: ~5 hSepOctober: ~21 hOctNovember: ~20 hNovDecember: ~20 hDec
Fog season runs October through February, peaking in January; fog is mostly a 3 AM–9 AM phenomenon; typically thinning out by 11 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.