Fog in Cedar Rapids, IA

daily fog outlook & 2016–2026 climatology
Some chance of fog — peaks at 31% around 2 am Sunday.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at The Eastern Iowa Airport (KCID). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KCIDThe Eastern Iowa Airport80 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 Cedar Rapids fogs in

Fog here concentrates in January and December — about 80 hours in a typical year at KCID, usually lasting ~2 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KCID station page.

Fog season

January: ~21 hJanFebruary: ~10 hFebMarch: ~6 hMarApril: ~2 hAprMay: ~3 hMayJune: ~3 hJunJuly: ~2 hJulAugust: ~5 hAugSeptember: ~4 hSepOctober: ~3 hOctNovember: ~7 hNovDecember: ~16 hDec
Fog season runs November through March, peaking in January; fog is mostly a midnight–9 AM phenomenon; typically thinning out by 5 PM; 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.