Waterloo, IA Weather & Growing Conditions
Today
78°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 78, with temperatures falling to around 76 in the afternoon. West wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Chance Showers And Thunderstorms | 9 mph W | 46% |
| Tonight | 61°F | Showers And Thunderstorms Likely | 5 to 9 mph N | 73% |
| Wednesday | 73°F | Chance Showers And Thunderstorms | 5 mph NNE | 32% |
| Wednesday Night | 55°F | Slight Chance Rain Showers | 5 mph N | 18% |
| Thursday | 78°F | Sunny | 5 mph E | 2% |
| Thursday Night | 60°F | Mostly Clear | 5 mph SSE | 0% |
| Friday | 81°F | Sunny | 3 to 10 mph SSE | 6% |
| Friday Night | 65°F | Mostly Clear | 9 mph S | 11% |
| Saturday | 84°F | Sunny | 6 to 10 mph S | 10% |
| Saturday Night | 69°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 13 mph S | 24% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 12 mph SSE | 24% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 10 mph SSE | 36% |
| Monday | 84°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 8 to 12 mph SSE | 36% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph E | 36% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waterloo, IA
Last spring frost
Apr 27
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
Explore more for Waterloo, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Waterloo Muni Ap, Ia (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.