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Sandwich, IL Weather & Growing Conditions

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

Today
80°F
Showers And Thunderstorms then Showers And Thunderstorms Likely
Showers and thunderstorms before 11am, then showers and thunderstorms likely. Cloudy. High near 80, with temperatures falling to around 77 in the afternoon. Southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast for Sandwich

WhenTempForecastWindPrecip
Today 80°F Showers And Thunderstorms then Showers And Thunderstorms Likely 5 to 10 mph SE 99%
Tonight 64°F Showers And Thunderstorms 5 to 10 mph ESE 96%
Sunday 71°F Showers And Thunderstorms Likely 10 to 15 mph NNE 62%
Sunday Night 56°F Chance Showers And Thunderstorms 15 mph NE 39%
Monday 65°F Chance Rain Showers 15 mph ENE 43%
Monday Night 52°F Chance Rain Showers 10 to 15 mph NE 27%
Tuesday 64°F Slight Chance Rain Showers 15 mph NE 19%
Tuesday Night 51°F Mostly Cloudy 10 to 15 mph NE 10%
Wednesday 67°F Mostly Sunny 10 to 15 mph NNE 6%
Wednesday Night 52°F Partly Cloudy 5 to 10 mph NNE 1%
Thursday 69°F Mostly Sunny 5 to 10 mph NNE 3%
Thursday Night 52°F Partly Cloudy 5 to 10 mph NNE 3%
Friday 73°F Mostly Sunny 5 to 10 mph NE 3%
Friday Night 52°F Partly Cloudy 5 to 10 mph NE 3%

Forecast source: National Weather Service (api.weather.gov) for Sandwich (41.650, -88.619). Updated through the day.

Growing snapshot for Sandwich

Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
5b

More local growing data for Sandwich: nearby ZIP 60548 weather · frost dates · planting calendar · Illinois frost dates

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Climate data from the nearest NOAA station, Chicago Aurora Muni Ap, Il (11.5 mi from Sandwich). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.