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Washington, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Washington, a city in Tazewell County, Illinois.

Overnight
68°F
Mostly Cloudy
Mostly cloudy, with a low around 68. Southeast wind around 9 mph, with gusts as high as 17 mph. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Washington

WhenTempForecastWindPrecip
Overnight 68°F Mostly Cloudy 9 mph SE 13%
Saturday 85°F Chance Showers And Thunderstorms 8 mph SE 39%
Saturday Night 67°F Showers And Thunderstorms Likely 5 mph WSW 64%
Sunday 74°F Showers And Thunderstorms Likely 5 to 14 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 16 mph ENE 63%
Monday Night 53°F Chance Rain Showers 13 to 16 mph NE 46%
Tuesday 64°F Slight Chance Rain Showers 15 mph NE 20%
Tuesday Night 51°F Partly Cloudy 8 to 14 mph NNE 13%
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) 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

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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 Sep 19, 2026.