Waterloo, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a city in Black Hawk County, Iowa.
Tonight
49°F
Slight Chance Rain Showers
A slight chance of rain showers before 5am. Cloudy. Low around 49, with temperatures rising to around 52 overnight. South southwest wind around 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Slight Chance Rain Showers | 10 mph SSW | 23% |
| Wednesday | 54°F | Chance Rain Showers | 12 to 15 mph WSW | 40% |
| Wednesday Night | 44°F | Rain Showers Likely | 14 mph WSW | 61% |
| Thursday | 52°F | Rain Showers Likely | 12 mph NW | 70% |
| Thursday Night | 39°F | Mostly Cloudy | 12 mph N | 14% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 2% |
| Friday Night | 32°F | Partly Cloudy | 0 to 3 mph NW | 0% |
| Saturday | 53°F | Mostly Sunny | 1 to 6 mph WSW | 2% |
| Saturday Night | 36°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 59°F | Sunny | 5 to 8 mph WNW | 7% |
| Sunday Night | 38°F | Mostly Clear | 6 mph SW | 2% |
| Monday | 62°F | Mostly Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 7 mph WNW | 0% |
| Tuesday | 60°F | Sunny | 7 mph WNW | 1% |
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 Nov 4, 2026.