Washington, IL Weather & Growing Conditions
Overnight
56°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 56. South southwest wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Light Rain | 13 mph SSW | 35% |
| Wednesday | 59°F | Patchy Drizzle | 15 mph SW | 13% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 13 mph WSW | 10% |
| Thursday | 57°F | Mostly Cloudy then Slight Chance Light Rain | 10 to 15 mph WSW | 22% |
| Thursday Night | 42°F | Chance Light Rain then Mostly Cloudy | 6 to 10 mph NW | 31% |
| Friday | 51°F | Partly Sunny | 8 to 12 mph N | 6% |
| Friday Night | 33°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Saturday | 52°F | Sunny | 1 to 6 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 3 mph WNW | 2% |
| Sunday | 57°F | Sunny | 3 to 8 mph W | 1% |
| Sunday Night | 34°F | Clear | 5 mph WSW | 0% |
| Monday | 63°F | Sunny | 2 to 9 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 0% |
| Tuesday | 64°F | Sunny | 5 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Washington, IL
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a
Explore more for Washington, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Congerville 2Nw, Il (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.