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Waterloo, WI Weather Forecast
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Waterloo Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  |  |  | |  |  |  | | | | |
| Chance of T-Storm | Patchy Fog | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Sunny | Partly Cloudy | Chance of Showers | Chance of T-Storm | Chance of Showers | Partly Cloudy | Partly Sunny |
| Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C |
| POP: 20% | POP: 20% | POP: 70% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 731 PM CDT Fri Sep 04 2026 
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Issued: 718 PM CDT Fri Sep 4 2026
Key Messages
- Isolated to scattered showers and thunderstorms will remain in the forecast this afternoon and tonight. There is a low probability for a strong or severe thunderstorm.
- Areas of dense fog will be possible late tonight and Saturday morning over Lake Michigan and over southern WI. Afterward, gradual lessening temperatures and humidity will be the trend for Labor Day Weekend.
- Very warm and humid conditions return next Tuesday and Wednesday along with chances for showers and thunderstorms...