Mill Creek, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mill Creek, a village in Union County, Illinois.
This Afternoon
101°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Sunny. High near 101, with temperatures falling to around 96 in the afternoon. Southwest wind around 2 mph. Chance of precipitation is 20%.
7-day forecast for Mill Creek
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 101°F | Slight Chance Showers And Thunderstorms | 2 mph SW | 16% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 1 mph SSE | 15% |
| Saturday | 99°F | Sunny | 0 to 6 mph SW | 2% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph SSW | 0% |
| Sunday | 98°F | Sunny | 1 to 6 mph WSW | 2% |
| Sunday Night | 71°F | Partly Cloudy | 3 mph NNW | 6% |
| Monday | 91°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph N | 44% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 3 to 8 mph N | 44% |
| Tuesday | 79°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 6 to 12 mph N | 16% |
| Tuesday Night | 59°F | Partly Cloudy | 5 to 12 mph N | 9% |
| Wednesday | 78°F | Mostly Sunny | 8 mph N | 3% |
| Wednesday Night | 58°F | Partly Cloudy | 2 to 7 mph NNE | 2% |
| Thursday | 79°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Thursday Night | 60°F | Partly Cloudy | 2 to 6 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Mill Creek (37.341, -89.253). Updated through the day.
Growing snapshot for Mill Creek
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
7a
More local growing data for Mill Creek: nearby ZIP 62961 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anna 2 Nne, Il (9.8 mi from Mill Creek). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.