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
85°F
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 85. South wind around 10 mph. Chance of precipitation is 20%.
7-day forecast for New Boston
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 10 mph S | 24% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph W | 78% |
| Sunday | 72°F | Showers And Thunderstorms | 10 to 15 mph NE | 80% |
| Sunday Night | 58°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 10 to 15 mph NE | 57% |
| Monday | 65°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 10 mph NE | 51% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 35% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 68°F | Mostly Sunny | 5 mph NE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 73°F | Mostly Sunny | 0 to 5 mph NE | 4% |
| Friday Night | 55°F | Partly Cloudy | 0 to 5 mph E | 5% |
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 Sep 19, 2026.