Harman US

Alvan (Alvin), IL Weather & Growing Conditions

Overnight
66°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Southeast wind around 6 mph. Chance of precipitation is 20%.

7-day forecast

WhenTempForecastWindPrecip
Overnight 66°F Slight Chance Showers And Thunderstorms 6 mph SE 19%
Saturday 85°F Showers And Thunderstorms Likely 7 mph SE 60%
Saturday Night 68°F Mostly Cloudy then Chance Showers And Thunderstorms 1 to 5 mph SSW 28%
Sunday 79°F Chance Showers And Thunderstorms 1 to 10 mph N 70%
Sunday Night 58°F Showers And Thunderstorms Likely then Chance Showers And Thunderstorms 13 mph NE 68%
Monday 68°F Showers And Thunderstorms Likely 12 to 15 mph ENE 62%
Monday Night 53°F Chance Rain Showers 10 to 15 mph NE 43%
Tuesday 67°F Chance Showers And Thunderstorms 13 mph NE 30%
Tuesday Night 53°F Chance Showers And Thunderstorms then Mostly Cloudy 6 to 12 mph NNE 30%
Wednesday 69°F Partly Sunny 9 mph NNE 7%
Wednesday Night 53°F Mostly Cloudy 3 to 9 mph NNE 7%
Thursday 71°F Partly Sunny 5 to 8 mph NNE 3%
Thursday Night 54°F Partly Cloudy 2 to 7 mph NNE 3%
Friday 73°F Mostly Sunny 3 to 8 mph NNE 2%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Alvan (Alvin), IL

Last spring frost
Apr 21
First fall frost
Oct 20
Growing season
181 days
Hardiness zone
6a

Explore more for Alvan (Alvin), IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Danville, Il (10.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.