Waterloo, IA Weather & Growing Conditions
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. East southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Showers And Thunderstorms | 7 mph ESE | 58% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 6 to 13 mph NNE | 45% |
| Sunday | 66°F | Chance Rain Showers | 15 mph NE | 44% |
| Sunday Night | 54°F | Slight Chance Drizzle then Chance Rain Showers | 15 mph ENE | 46% |
| Monday | 61°F | Rain Showers Likely | 15 mph ENE | 66% |
| Monday Night | 49°F | Rain Showers Likely | 9 to 13 mph NE | 66% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 32% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 8 mph NE | 3% |
| Wednesday | 64°F | Mostly Sunny | 7 mph ENE | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph E | 3% |
| Thursday | 66°F | Partly Sunny | 5 mph ESE | 12% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 3 mph ESE | 22% |
| Friday | 70°F | Slight Chance Rain Showers then Partly Sunny | 5 mph E | 17% |
| Friday Night | 56°F | Partly Cloudy | 5 mph E | 10% |
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 (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.