New Athens, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Athens, a village in St. Clair County, Illinois.
This Afternoon
97°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 97. Heat index values as high as 105. South wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for New Athens
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Chance Showers And Thunderstorms | 2 mph S | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SE | 24% |
| Saturday | 97°F | Mostly Sunny | 2 to 6 mph SW | 6% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph S | 0% |
| Sunday | 95°F | Mostly Sunny | 5 mph W | 13% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph N | 47% |
| Monday | 82°F | Showers And Thunderstorms Likely | 3 to 9 mph N | 61% |
| Monday Night | 60°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 to 9 mph N | 61% |
| Tuesday | 72°F | Slight Chance Rain Showers then Partly Sunny | 10 mph N | 21% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 10 mph N | 7% |
| Wednesday | 75°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Thursday | 75°F | Mostly Sunny | 2 to 7 mph N | 2% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 6 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov) for New Athens (38.319, -89.874). Updated through the day.
Growing snapshot for New Athens
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
7a
More local growing data for New Athens: nearby ZIP 62264 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (14.4 mi from New Athens). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.