South Dakota dense fog advisories

There are no dense fog advisories in South Dakota right now. The last one was issued on November 13, 2026.

Fog will reduce visibility to a quarter mile or less, making driving hazardous.

Updated 2:01 PM CST from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS

Map data: NWS, OpenFreeMap, OpenStreetMap

Active dense fog advisories in South Dakota

None right now. Other active alerts in South Dakota: none.

Dense Fog Advisories in South Dakota by year

South Dakota averaged 43.9 dense fog advisories per year from 2016 to 2025, and has had 57 so far in 2026. The most recent was issued on November 13, 2026.

Dense Fog Advisories issued in South Dakota per year

Dense Fog Advisories in South Dakota by month, 2016–2025

Counties with the most dense fog advisories

County	2016–2025
Moody County	121
Lake County	117
Minnehaha County	113
Codington County	113
Deuel County	113
Brookings County	112
Hamlin County	112
Grant County	111
Lincoln County	111
Edmunds County	105

What a dense fog advisory means

Dense fog can cause chain-reaction crashes on highways because drivers suddenly lose sight of the road ahead.

More about dense fog advisories and the national map →

What to do

Slow down, use low-beam headlights and leave plenty of distance.
Never use high beams in fog.