Nason, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Nason, a city in Jefferson County, Illinois.
This Afternoon
99°F
Mostly Sunny
Mostly sunny. High near 99, with temperatures falling to around 97 in the afternoon. West southwest wind around 7 mph.
7-day forecast for Nason
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Mostly Sunny | 7 mph WSW | 1% |
| Tonight | 73°F | Partly Cloudy | 1 to 5 mph SSW | 2% |
| Sunday | 97°F | Mostly Sunny | 3 to 7 mph WSW | 3% |
| Sunday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 7 mph NNE | 43% |
| Monday | 86°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 50% |
| Monday Night | 61°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 53% |
| Tuesday | 77°F | Chance Showers And Thunderstorms then Partly Sunny | 7 to 14 mph NNE | 53% |
| Tuesday Night | 57°F | Partly Cloudy | 6 to 14 mph N | 3% |
| Wednesday | 77°F | Mostly Sunny | 7 to 10 mph N | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 3 to 10 mph N | 1% |
| Thursday | 78°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Thursday Night | 57°F | Partly Cloudy | 2 to 7 mph NNE | 1% |
| Friday | 80°F | Partly Sunny then Slight Chance Rain Showers | 3 to 8 mph NNE | 15% |
| Friday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 7 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Nason (38.176, -88.966). Updated through the day.
Growing snapshot for Nason
Last spring frost
Apr 4
First fall frost
Oct 28
Growing season
206 days
Hardiness zone
6b
More local growing data for Nason: nearby ZIP 62816 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Benton 2 N, Il (10.8 mi from Nason). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.