Waterloo, IA Weather & Growing Conditions
Today
52°F
Slight Chance Rain Showers
A slight chance of rain showers before 5pm. Cloudy. High near 52, with temperatures falling to around 50 in the afternoon. West southwest wind 15 to 18 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Slight Chance Rain Showers | 15 to 18 mph WSW | 20% |
| Tonight | 44°F | Chance Rain Showers | 16 mph W | 37% |
| Thursday | 53°F | Chance Rain Showers | 15 mph NW | 37% |
| Thursday Night | 37°F | Mostly Cloudy | 9 to 13 mph N | 11% |
| Friday | 48°F | Mostly Sunny | 5 to 10 mph N | 4% |
| Friday Night | 29°F | Partly Cloudy | 0 to 3 mph N | 0% |
| Saturday | 51°F | Mostly Sunny | 1 to 6 mph WNW | 0% |
| Saturday Night | 34°F | Mostly Clear | 6 mph WSW | 1% |
| Sunday | 56°F | Sunny | 5 to 8 mph W | 3% |
| Sunday Night | 35°F | Clear | 6 mph SW | 0% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 7 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 3 mph N | 1% |
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 Nov 4, 2026.