Lenzburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lenzburg, a village in St. Clair County, Illinois.
This Afternoon
98°F
Mostly Sunny
Mostly sunny, with a high near 98. Heat index values as high as 100. Southwest wind around 3 mph.
7-day forecast for Lenzburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Mostly Sunny | 3 mph SW | 1% |
| Tonight | 72°F | Partly Cloudy | 1 to 5 mph S | 2% |
| Sunday | 94°F | Mostly Sunny | 6 mph W | 3% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 mph N | 58% |
| Monday | 82°F | Showers And Thunderstorms Likely | 5 to 8 mph NE | 56% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 47% |
| Tuesday | 73°F | Chance Rain Showers then Partly Sunny | 7 to 10 mph N | 36% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 10 mph N | 1% |
| Wednesday | 74°F | Mostly Sunny | 6 to 9 mph N | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 7 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 2 to 6 mph N | 1% |
| Thursday Night | 57°F | Mostly Cloudy | 1 to 5 mph N | 4% |
| Friday | 79°F | Slight Chance Rain Showers | 2 to 6 mph NE | 15% |
| Friday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Lenzburg (38.286, -89.818). Updated through the day.
Growing snapshot for Lenzburg
Last spring frost
Apr 12
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6b
More local growing data for Lenzburg: nearby ZIP 62255 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Sparta 1 W, Il (14 mi from Lenzburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.