Waterloo, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a city in Black Hawk County, Iowa.
Overnight
66°F
Mostly Cloudy
Mostly cloudy, with a low around 66. South wind around 7 mph.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Mostly Cloudy | 7 mph S | 1% |
| Tuesday | 80°F | Chance Showers And Thunderstorms | 8 mph WSW | 37% |
| Tuesday Night | 62°F | Showers And Thunderstorms | 3 to 8 mph N | 76% |
| Wednesday | 74°F | Chance Showers And Thunderstorms | 5 mph NNE | 33% |
| Wednesday Night | 56°F | Slight Chance Rain Showers | 1 to 5 mph N | 20% |
| Thursday | 79°F | Sunny | 3 mph ENE | 2% |
| Thursday Night | 61°F | Mostly Clear | 3 mph SSE | 0% |
| Friday | 82°F | Sunny | 2 to 8 mph SSE | 6% |
| Friday Night | 66°F | Mostly Clear | 7 mph S | 11% |
| Saturday | 86°F | Sunny | 5 to 8 mph S | 9% |
| Saturday Night | 70°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 10 mph S | 23% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph S | 23% |
| 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) for Waterloo (42.492, -92.352). Updated through the day.
Growing snapshot for Waterloo
Last spring frost
Apr 27
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
5a
More local growing data for Waterloo: nearby ZIP 50702 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Cedar Falls
Dunkerton
Elk Run Heights
Evansdale
Gilbertville
Hudson
Jesup
La Porte City
Raymond
Washburn
Climate data from the nearest NOAA station, Waterloo Muni Ap, Ia (7.8 mi from Waterloo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.