Fog in South Bend, IN

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 South Bend International Airport (KSBN). This station is in forecast verification — percentages publish when it clears the accuracy bar.

Measuring station

stationairportfog hours/yrforecast
KSBNSouth Bend International Airport49 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 South Bend fogs in

Fog here concentrates in January and December — about 49 hours in a typical year at KSBN, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KSBN station page.

Fog season

January: ~11 hJanFebruary: ~6 hFebMarch: ~4 hMarApril: ~2 hAprMay: ~0 hMayJune: ~1 hJunJuly: ~3 hJulAugust: ~3 hAugSeptember: ~5 hSepOctober: ~3 hOctNovember: ~5 hNovDecember: ~7 hDec
Fog season runs July through March, peaking in January; fog is mostly a 4 AM–9 AM phenomenon; typically thinning out by 11 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.