Fog in Houston, TX

daily fog outlook & 2016–2026 climatology
Fog possible — NWS guidance shows a fog signal in the next 48 hours. August typically brings about 1 hour of dense fog here.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at George Bush Intercontinental Airport (KIAH). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring stations

stationairportfog hours/yrforecast
KIAHGeorge Bush Intercontinental Airport81 h/yrverifying
KHOUWilliam P. Hobby Airport36 h/yrverifying
KEFDEllington Airport77 h/yrverifying
KCXOConroe-North Houston Regional Airport72 h/yrverifying
KSGRSugar Land Regional Airport44 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 Houston fogs in

Fog here concentrates in February and December — about 81 hours in a typical year at KIAH, usually lasting ~3 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KIAH station page.

Fog season

January: ~14 hJanFebruary: ~20 hFebMarch: ~6 hMarApril: ~4 hAprMay: ~2 hMayJune: ~1 hJunJuly: ~1 hJulAugust: ~1 hAugSeptember: ~1 hSepOctober: ~4 hOctNovember: ~9 hNovDecember: ~19 hDec
Fog season runs November through March, peaking in February; fog is mostly a 1 AM–8 AM phenomenon; typically thinning out by 10 AM; a typical event lasts about 3 hours once it forms local time · 10-yr average

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