Saturday, July 11 NWS Outlook: Patchy River Valley Fog Early Sunday; Heat Indices May Reach 100 at Times Mon–Wed
Sheboygan County, WI — Saturday, July 11, 2026
The National Weather Service (NWS) Milwaukee/Sullivan issued a Hazardous Weather Outlook for Sheboygan County (WIZ052/WIC117) at 11:47 AM CDT Saturday, July 11. The outlook highlights two practical impacts for residents and commuters: patchy river valley fog possible Saturday night into early Sunday, July 12, and hot conditions returning Monday through Wednesday with heat indices may reach 100 at times.
Fog risk: early-Sunday driving caution for July 12
NWS said patchy river valley fog is possible tonight into early Sunday. If you’re traveling early Sunday, use extra caution in low-lying/river-valley areas and be ready for brief visibility drops—slow down and allow extra time if conditions change.
Heat risk: Monday, July 13 late-morning to afternoon
For the Sheboygan County forecast, NWS calls Monday hot and humid and notes the highest heat-index timing: highest heat index readings 98 to 103 in the late morning and afternoon on Monday, July 13. NWS also warns that hot conditions continue Monday–Wednesday, with heat indices may reach 100 at times.
What to do next (simple steps)
- Hydration plan: drink water before you feel thirsty.
- Limit peak-time exertion: reduce hard outdoor activity during the late morning/afternoon heat window on Monday, July 13.
- Check on vulnerable neighbors: ReadyWisconsin flags groups such as children under 5, adults over 65, and people living alone and/or without air conditioning.
- Know where to cool down: ReadyWisconsin recommends identifying community cooling options like libraries and shopping malls ahead of time.
For Wisconsin extreme-heat preparedness steps, see ReadyWisconsin’s guidance. WPR also reports Wisconsin’s 211 hotline can connect callers to programs and services, including cooling centers, if you need help finding local options.
