Fog in Hayward, WI

daily fog outlook & 2016–2026 climatology
Some chance of fog — peaks at 24% around 4 am Monday.forecast cycle 2026-08-16T00:00:00Z · page rebuilt daily · live layers below update hourly

Measured at Sawyer County Airport (KHYR). Forecast percentages for this station have passed live verification.

Measuring station

stationairportfog hours/yrforecast
KHYRSawyer County Airport74 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 Hayward fogs in

Fog here concentrates in September and August — about 74 hours in a typical year at KHYR, usually lasting ~1 h once it forms. Hour-by-hour patterns, live conditions and the forecast strip live on the KHYR station page.

Fog season

January: ~4 hJanFebruary: ~5 hFebMarch: ~3 hMarApril: ~3 hAprMay: ~4 hMayJune: ~5 hJunJuly: ~11 hJulAugust: ~12 hAugSeptember: ~14 hSepOctober: ~6 hOctNovember: ~3 hNovDecember: ~4 hDec
Fog season is January, February, May, June, July, August, September, October, December, peaking in September; fog is mostly a 2 AM–6 AM phenomenon; typically thinning out by 8 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.