Waterloo, IA Weather & Growing Conditions
This Afternoon
49°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy, with a high near 49. West southwest wind around 17 mph, with gusts as high as 23 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Slight Chance Rain Showers | 17 mph WSW | 17% |
| Tonight | 43°F | Chance Rain Showers | 15 mph W | 45% |
| Thursday | 50°F | Chance Rain Showers | 16 mph NW | 28% |
| Thursday Night | 35°F | Mostly Cloudy | 9 to 13 mph N | 5% |
| Friday | 46°F | Mostly Sunny | 6 to 9 mph N | 0% |
| Friday Night | 27°F | Mostly Clear | 0 to 5 mph NNW | 0% |
| Saturday | 51°F | Mostly Sunny | 0 to 7 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 6 mph WSW | 0% |
| Sunday | 57°F | Sunny | 7 mph W | 0% |
| Sunday Night | 35°F | Clear | 5 mph SW | 0% |
| Monday | 63°F | Sunny | 5 to 12 mph SSW | 0% |
| Monday Night | 39°F | Mostly Clear | 3 to 8 mph W | 0% |
| Tuesday | 59°F | Sunny | 5 mph NW | 1% |
| Tuesday Night | 39°F | Partly Cloudy | 5 mph NNW | 2% |
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 (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.