Washington, IL Weather & Growing Conditions

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

Overnight

56°F

Chance Light Rain

A chance of rain. Mostly cloudy, with a low around 56. South southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Washington

When	Temp	Forecast	Wind	Precip
Overnight	56°F	Chance Light Rain	14 mph SSW	45%
Wednesday	59°F	Patchy Drizzle	15 mph SW	13%
Wednesday Night	46°F	Patchy Drizzle then Mostly Cloudy	13 mph WSW	10%
Thursday	56°F	Mostly Cloudy then Slight Chance Light Rain	10 to 14 mph WSW	22%
Thursday Night	42°F	Chance Light Rain then Mostly Cloudy	6 to 10 mph NW	29%
Friday	51°F	Partly Sunny	8 to 12 mph N	6%
Friday Night	33°F	Partly Cloudy	2 to 7 mph NNW	0%
Saturday	52°F	Sunny	2 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	35°F	Clear	3 mph WSW	0%
Monday	62°F	Sunny	2 to 8 mph SW	0%
Monday Night	40°F	Mostly Clear	6 mph WSW	0%
Tuesday	64°F	Sunny	5 mph WNW	1%

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

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 Nov 4, 2026.