Fog in Astoria, OR

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. 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 Astoria Regional Airport (KAST). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KASTAstoria Regional Airport66 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 Astoria fogs in

Fog here concentrates in October and September — about 66 hours in a typical year at KAST, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KAST station page.

Fog season

January: ~6 hJanFebruary: ~7 hFebMarch: ~5 hMarApril: ~2 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~3 hJulAugust: ~4 hAugSeptember: ~9 hSepOctober: ~13 hOctNovember: ~7 hNovDecember: ~8 hDec
Fog season runs August through March, peaking in October; fog is mostly a 4 AM–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.