Arthur, IL Weather & Growing Conditions
Overnight
70°F
Mostly Clear
Mostly clear, with a low around 70. South southeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Mostly Clear | 6 mph SSE | 7% |
| Saturday | 91°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph SW | 21% |
| Saturday Night | 69°F | Mostly Cloudy | 6 mph S | 12% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 3 to 10 mph N | 44% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms | 13 mph NE | 60% |
| Monday | 71°F | Showers And Thunderstorms Likely | 14 mph NE | 69% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 47% |
| Tuesday | 68°F | Chance Showers And Thunderstorms | 14 mph NE | 27% |
| Tuesday Night | 52°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 to 14 mph NNE | 27% |
| Wednesday | 70°F | Mostly Sunny | 10 mph NNE | 5% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 10 mph N | 4% |
| Thursday | 72°F | Mostly Sunny | 6 to 9 mph NNE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 5 to 8 mph NNE | 3% |
| Friday | 75°F | Mostly Sunny | 6 to 9 mph NE | 2% |
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 Sep 19, 2026.