Washington, IL Weather & Growing Conditions
Overnight
69°F
Mostly Cloudy
Mostly cloudy, with a low around 69. South southeast wind around 8 mph, with gusts as high as 16 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 69°F | Mostly Cloudy | 8 mph SSE | 9% |
| Saturday | 86°F | Chance Showers And Thunderstorms | 7 mph SE | 40% |
| Saturday Night | 69°F | Showers And Thunderstorms Likely | 3 to 7 mph SW | 64% |
| Sunday | 74°F | Showers And Thunderstorms Likely | 5 to 15 mph N | 70% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 16 mph NE | 56% |
| Monday | 65°F | Showers And Thunderstorms Likely | 17 mph ENE | 63% |
| Monday Night | 53°F | Chance Rain Showers | 12 to 17 mph NE | 46% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 20% |
| Tuesday Night | 51°F | Partly Cloudy | 8 to 15 mph NNE | 14% |
| Wednesday | 67°F | Mostly Sunny | 12 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph NNE | 1% |
| Thursday | 69°F | Mostly Sunny | 8 mph NNE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 3 to 7 mph NE | 2% |
| Friday | 72°F | Mostly Sunny | 5 to 8 mph NE | 3% |
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 Sep 19, 2026.