Barstow, IL Weather & Growing Conditions
This Afternoon
87°F
Mostly Sunny
Mostly sunny. High near 87, with temperatures falling to around 85 in the afternoon. Southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 87°F | Mostly Sunny | 5 to 10 mph SW | 7% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph NW | 74% |
| Wednesday | 79°F | Showers And Thunderstorms | 5 mph N | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 0 to 5 mph N | 76% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 50% |
| Thursday Night | 62°F | Mostly Clear | 0 to 5 mph NE | 11% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 6% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 85°F | Sunny | 5 to 10 mph S | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 15% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 35% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 35% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 35% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Barstow, IL
Last spring frost
Apr 16
First fall frost
Oct 25
Growing season
190 days
Hardiness zone
5b
Explore more for Barstow, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Le Claire L&D 14, Ia (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.