Waterloo, IA Weather & Growing Conditions
Today
75°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 75. South southwest wind around 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Chance Showers And Thunderstorms | 8 mph SSW | 60% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 8 to 13 mph N | 47% |
| Sunday | 66°F | Chance Rain Showers then Chance Drizzle | 16 mph NE | 32% |
| Sunday Night | 53°F | Chance Rain Showers | 15 mph ENE | 39% |
| Monday | 62°F | Chance Rain Showers | 16 mph ENE | 42% |
| Monday Night | 48°F | Chance Rain Showers | 10 to 14 mph NE | 42% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 12 mph ENE | 17% |
| Tuesday Night | 45°F | Mostly Clear | 5 to 9 mph ENE | 3% |
| Wednesday | 65°F | Sunny | 7 mph ENE | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 6 mph ENE | 3% |
| Thursday | 66°F | Mostly Sunny | 6 mph E | 7% |
| Thursday Night | 52°F | Partly Cloudy | 5 mph E | 5% |
| Friday | 69°F | Mostly Sunny | 3 to 7 mph E | 5% |
| Friday Night | 53°F | Partly Cloudy | 6 mph ESE | 8% |
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 Sep 19, 2026.