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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
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.