Washington, IL Weather & Growing Conditions
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South southeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph SSE | 0% |
| Tuesday | 86°F | Mostly Sunny | 7 mph SSW | 0% |
| Tuesday Night | 67°F | Partly Cloudy | 6 mph S | 13% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 7 mph SSW | 39% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph NW | 89% |
| Thursday | 80°F | Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSE | 15% |
| Friday | 83°F | Mostly Sunny | 3 mph S | 14% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 mph SW | 19% |
| Saturday | 86°F | Mostly Sunny | 3 to 7 mph SSW | 10% |
| Saturday Night | 70°F | Mostly Clear | 3 to 9 mph S | 10% |
| Sunday | 88°F | Sunny | 9 to 13 mph SSW | 8% |
| Sunday Night | 72°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 18% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 18% |
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 Aug 4, 2026.