Washington, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Washington, a city in Tazewell County, Illinois.
Overnight
63°F
Mostly Clear
Mostly clear, with a low around 63. South wind around 5 mph.
7-day forecast for Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 63°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 86°F | Mostly Sunny | 7 mph SSW | 0% |
| Tuesday Night | 67°F | Partly Cloudy | 6 mph S | 14% |
| 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 NNW | 89% |
| Thursday | 80°F | Showers And Thunderstorms | 5 mph S | 79% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SSE | 15% |
| Friday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 mph S | 15% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 3 mph SW | 18% |
| Saturday | 85°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 | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 19% |
| Monday | 88°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph SSW | 19% |
Forecast source: National Weather Service (api.weather.gov) for Washington (40.706, -89.433). Updated through the day.
Growing snapshot for Washington
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a
More local growing data for Washington: nearby ZIP 61571 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Armington
Creve Coeur
Deer Creek
Delavan
East Peoria
Green Valley
Heritage Lake
Hopedale
Mackinaw
Manito
Marquette Heights
Minier
Morton
North Pekin
Pekin
South Pekin
Tremont
Climate data from the nearest NOAA station, Congerville 2Nw, Il (11.2 mi from Washington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.