Waterloo, IA Weather & Growing Conditions
Overnight
65°F
Partly Cloudy
Partly cloudy, with a low around 65. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Partly Cloudy | 7 mph S | 1% |
| Tuesday | 80°F | Chance Showers And Thunderstorms | 9 mph W | 36% |
| Tuesday Night | 61°F | Showers And Thunderstorms | 5 to 9 mph N | 78% |
| Wednesday | 74°F | Chance Showers And Thunderstorms | 5 mph NNE | 33% |
| Wednesday Night | 55°F | Slight Chance Rain Showers | 1 to 5 mph N | 22% |
| Thursday | 79°F | Sunny | 3 mph ENE | 3% |
| Thursday Night | 60°F | Mostly Clear | 3 mph SSE | 0% |
| Friday | 82°F | Sunny | 2 to 9 mph SSE | 6% |
| Friday Night | 65°F | Mostly Clear | 8 mph S | 12% |
| Saturday | 85°F | Sunny | 5 to 8 mph S | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 12 mph S | 22% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph S | 22% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 9 mph SSE | 35% |
| Monday | 85°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 7 to 10 mph SSE | 35% |
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 (7.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.