Waterloo, WI Weather & Growing Conditions
Today
83°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of rain showers between 3pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 34% |
| Tonight | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 87% |
| Wednesday | 75°F | Patchy Fog then Mostly Cloudy | 5 mph W | 51% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 25% |
| Thursday | 79°F | Mostly Sunny | 0 mph | 11% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 7% |
| Friday | 82°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 62°F | Mostly Clear | 5 mph SW | 5% |
| Saturday | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph S | 31% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 10 mph SW | 31% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 49% |
| Monday | 83°F | Chance Rain Showers | 5 mph SW | 47% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph N | 42% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waterloo, WI
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
163 days
Hardiness zone
5b
Explore more for Waterloo, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Waterloo Wwtp, Wi (0.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.