Washington, IA Weather & Growing Conditions
Tonight
50°F
Mostly Cloudy
Mostly cloudy. Low around 50, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Cloudy | 10 to 15 mph S | 14% |
| Wednesday | 54°F | Slight Chance Rain Showers | 15 mph SW | 22% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 to 15 mph SW | 9% |
| Thursday | 53°F | Chance Rain Showers | 10 to 15 mph W | 32% |
| Thursday Night | 42°F | Chance Rain Showers then Mostly Cloudy | 10 mph NW | 34% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 11% |
| Friday Night | 34°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Saturday | 53°F | Partly Sunny | 0 to 5 mph W | 2% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 3% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 8% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 3% |
| Monday | 64°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Washington, IA
Last spring frost
Apr 28
First fall frost
Oct 11
Growing season
165 days
Hardiness zone
5b
Explore more for Washington, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Washington, Ia (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.