New Boston, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Boston, a city in Mercer County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South wind around 5 mph.
7-day forecast for New Boston
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 mph S | 7% |
| Tonight | 67°F | Showers And Thunderstorms Likely | 5 mph NE | 58% |
| Wednesday | 80°F | Showers And Thunderstorms Likely | 5 mph NE | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 78% |
| Thursday | 81°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 58% |
| Thursday Night | 62°F | Mostly Clear | 0 mph | 7% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 13% |
| Saturday | 86°F | Sunny | 0 to 5 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear | 5 to 10 mph S | 11% |
| Sunday | 88°F | Sunny | 5 to 10 mph S | 11% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 25% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 25% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 30% |
Forecast source: National Weather Service (api.weather.gov) for New Boston (41.170, -91.000). Updated through the day.
Growing snapshot for New Boston
Last spring frost
Apr 14
First fall frost
Oct 24
Growing season
190 days
Hardiness zone
5b
More local growing data for New Boston: nearby ZIP 61272 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, New Boston Dam 17, Il (4.7 mi from New Boston). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.