Fog in Pittsburgh, PA

daily fog outlook & 2016–2026 climatology
No fog signal in NWS guidance for the next 48 hours. August typically brings about 3 hours of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Pittsburgh International Airport (KPIT). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring stations

stationairportfog hours/yrforecast
KPITPittsburgh International Airport37 h/yrverifying
KAGCAllegheny County Airport60 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 Pittsburgh fogs in

Fog here concentrates in December and February — about 37 hours in a typical year at KPIT, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KPIT station page.

Fog season

January: ~4 hJanFebruary: ~6 hFebMarch: ~2 hMarApril: ~1 hAprMay: ~3 hMayJune: ~1 hJunJuly: ~2 hJulAugust: ~3 hAugSeptember: ~2 hSepOctober: ~3 hOctNovember: ~4 hNovDecember: ~7 hDec
Fog season is January, February, March, May, July, August, September, October, November, December, peaking in December; 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.