Arthur, IL Weather & Growing Conditions
This Afternoon
75°F
Chance Light Rain
A chance of rain after 4pm. Partly sunny, with a high near 75. South southeast wind around 21 mph, with gusts as high as 35 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Chance Light Rain | 21 mph SSE | 31% |
| Tonight | 55°F | Rain | 14 to 18 mph S | 96% |
| Wednesday | 63°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph SW | 24% |
| Wednesday Night | 43°F | Mostly Cloudy | 9 mph SW | 0% |
| Thursday | 63°F | Mostly Sunny | 8 to 14 mph WSW | 2% |
| Thursday Night | 41°F | Mostly Cloudy | 6 mph WNW | 9% |
| Friday | 57°F | Partly Sunny | 6 to 10 mph NNW | 12% |
| Friday Night | 35°F | Partly Cloudy | 3 to 8 mph NNW | 6% |
| Saturday | 55°F | Partly Sunny | 6 mph NW | 1% |
| Saturday Night | 32°F | Partly Cloudy | 3 mph W | 1% |
| Sunday | 61°F | Sunny | 3 to 9 mph W | 9% |
| Sunday Night | 32°F | Mostly Clear | 6 mph WNW | 6% |
| Monday | 64°F | Sunny | 3 to 10 mph WSW | 2% |
| Monday Night | 37°F | Mostly Clear | 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arthur, IL
Last spring frost
Apr 15
First fall frost
Oct 20
Growing season
188 days
Hardiness zone
6a
Explore more for Arthur, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Tuscola, Il (11.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.