Waterloo, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waterloo, a city in Black Hawk County, Iowa.
This Afternoon
76°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3pm, then showers and thunderstorms likely. Mostly cloudy. High near 76, with temperatures falling to around 74 in the afternoon. Southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Waterloo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Showers And Thunderstorms | 7 mph SE | 58% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 6 to 12 mph NNE | 46% |
| Sunday | 67°F | Chance Rain Showers | 14 mph NE | 42% |
| Sunday Night | 54°F | Slight Chance Drizzle then Chance Rain Showers | 14 mph ENE | 45% |
| Monday | 61°F | Rain Showers Likely | 14 mph ENE | 65% |
| Monday Night | 50°F | Rain Showers Likely | 8 to 12 mph NE | 65% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 32% |
| Tuesday Night | 47°F | Partly Cloudy | 7 mph NE | 3% |
| Wednesday | 65°F | Mostly Sunny | 6 mph ENE | 1% |
| Wednesday Night | 51°F | Partly Cloudy | 5 mph E | 3% |
| Thursday | 67°F | Partly Sunny | 3 mph ESE | 13% |
| Thursday Night | 56°F | Slight Chance Rain Showers | 3 mph ESE | 22% |
| Friday | 70°F | Slight Chance Rain Showers then Partly Sunny | 5 mph E | 16% |
| Friday Night | 57°F | Partly Cloudy | 3 mph E | 10% |
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 Sep 19, 2026.