New Hampshire dense fog advisories
There are no dense fog advisories in New Hampshire right now. The last one was issued on June 28, 2026.
Fog will reduce visibility to a quarter mile or less, making driving hazardous.
Updated 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 New Hampshire
None right now. Other active alerts in New Hampshire: none.
Dense Fog Advisories in New Hampshire by year
New Hampshire averaged 11.9 dense fog advisories per year from 2016 to 2025, and has had 3 so far in 2026. The most recent was issued on June 28, 2026.
Counties with the most dense fog advisories
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.