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
78°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 4pm and 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 78, with temperatures falling to around 74 in the afternoon. South wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
7-day forecast for Mill Creek
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Showers And Thunderstorms | 18 mph S | 30% |
| Tonight | 56°F | Showers And Thunderstorms | 6 to 14 mph S | 99% |
| Wednesday | 68°F | Partly Sunny | 5 to 9 mph WSW | 7% |
| Wednesday Night | 43°F | Mostly Clear | 0 to 3 mph WSW | 0% |
| Thursday | 69°F | Sunny | 0 to 7 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 1 mph NW | 5% |
| Friday | 62°F | Partly Sunny | 2 to 9 mph NNW | 1% |
| Friday Night | 40°F | Partly Cloudy | 2 to 6 mph NNW | 1% |
| Saturday | 58°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NNW | 1% |
| Sunday | 63°F | Sunny | 0 to 6 mph WNW | 5% |
| Sunday Night | 35°F | Mostly Clear | 2 mph NW | 5% |
| Monday | 65°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 38°F | Mostly Clear | 0 to 3 mph WSW | 0% |
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 Nov 3, 2026.