Sandwich, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sandwich, a city in Dekalb County, Illinois.
Tonight
64°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 64. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Sandwich
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 64°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph ESE | 39% |
| Saturday | 80°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 78% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph ENE | 81% |
| Sunday | 70°F | Showers And Thunderstorms | 10 to 15 mph NE | 81% |
| Sunday Night | 56°F | Rain Showers Likely | 15 mph NE | 67% |
| Monday | 66°F | Chance Rain Showers | 15 mph ENE | 53% |
| Monday Night | 52°F | Chance Rain Showers | 15 mph NE | 32% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 24% |
| Tuesday Night | 51°F | Mostly Cloudy | 10 to 15 mph NNE | 10% |
| Wednesday | 68°F | Partly Sunny | 10 to 15 mph NNE | 6% |
| Wednesday Night | 51°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NNE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NNE | 3% |
| Friday | 72°F | Mostly Sunny | 5 to 10 mph NNE | 4% |
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
Nearby towns & communities
Cortland
DeKalb
Genoa
Hinckley
Kingston
Kirkland
Lake Holiday
Malta
Shabbona
Somonauk
Sycamore
Waterman
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.