Arthur, IL Weather & Growing Conditions
Today
86°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 86. South southeast wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Patchy Fog then Sunny | 2 to 6 mph SSE | 0% |
| Tonight | 66°F | Mostly Clear | 3 mph SSE | 0% |
| Wednesday | 86°F | Mostly Sunny | 3 to 7 mph S | 2% |
| Wednesday Night | 67°F | Slight Chance Showers And Thunderstorms | 6 mph S | 53% |
| Thursday | 83°F | Showers And Thunderstorms | 3 to 7 mph SSW | 75% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms | 5 mph S | 30% |
| Friday | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SSW | 19% |
| Saturday | 86°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph SSW | 17% |
| Saturday Night | 69°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 7 mph SSW | 15% |
| Sunday | 88°F | Sunny | 7 to 10 mph SSW | 8% |
| Sunday Night | 71°F | Mostly Clear | 9 mph SSW | 10% |
| Monday | 89°F | Mostly Sunny | 10 mph SSW | 14% |
| Monday Night | 72°F | Chance Showers And Thunderstorms | 9 mph SW | 25% |
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 Aug 4, 2026.