Brighton, IL Weather & Growing Conditions
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 54. Southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 10 mph SW | 19% |
| Wednesday | 61°F | Slight Chance Drizzle then Mostly Cloudy | 10 to 16 mph W | 12% |
| Wednesday Night | 44°F | Partly Cloudy | 8 mph W | 1% |
| Thursday | 62°F | Mostly Sunny | 8 to 13 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 5 to 8 mph NW | 2% |
| Friday | 56°F | Partly Sunny | 12 mph N | 1% |
| Friday Night | 34°F | Partly Cloudy | 3 to 9 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 5 mph NW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 3 mph NW | 0% |
| Sunday | 60°F | Sunny | 3 to 7 mph NW | 1% |
| Sunday Night | 35°F | Clear | 3 mph W | 0% |
| Monday | 64°F | Sunny | 2 to 7 mph SW | 0% |
| Monday Night | 40°F | Clear | 5 mph SW | 0% |
| Tuesday | 67°F | Sunny | 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Brighton, IL
Last spring frost
Apr 14
First fall frost
Oct 19
Growing season
187 days
Hardiness zone
6b
Explore more for Brighton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Jerseyville 2 Sw, Il (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.