Arrowsmith, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arrowsmith, a village in Mclean County, Illinois.
This Afternoon
71°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 2pm, then a chance of rain and a slight chance of thunderstorms. Mostly cloudy, with a high near 71. South wind 21 to 24 mph, with gusts as high as 36 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Arrowsmith
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Slight Chance T-storms | 21 to 24 mph S | 46% |
| Tonight | 55°F | Light Rain | 16 to 21 mph S | 89% |
| Wednesday | 61°F | Chance Light Rain then Mostly Cloudy | 15 to 18 mph SW | 31% |
| Wednesday Night | 45°F | Mostly Cloudy | 14 mph SW | 6% |
| Thursday | 60°F | Partly Sunny | 12 to 18 mph WSW | 6% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 9 mph WNW | 24% |
| Friday | 55°F | Slight Chance Light Rain then Partly Sunny | 9 to 13 mph NNW | 19% |
| Friday Night | 35°F | Mostly Cloudy | 6 to 12 mph NNW | 5% |
| Saturday | 53°F | Mostly Sunny | 6 mph NW | 3% |
| Saturday Night | 33°F | Partly Cloudy | 6 mph W | 4% |
| Sunday | 58°F | Sunny | 6 to 12 mph W | 12% |
| Sunday Night | 34°F | Mostly Clear | 8 mph WNW | 8% |
| Monday | 63°F | Sunny | 6 to 14 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 7 to 10 mph WSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Arrowsmith (40.449, -88.632). Updated through the day.
Growing snapshot for Arrowsmith
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a
More local growing data for Arrowsmith: nearby ZIP 61722 weather · frost dates · planting calendar · Illinois frost dates
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McLean
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Climate data from the nearest NOAA station, Gibson City, Il (14.1 mi from Arrowsmith). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.