Brighton, IL Weather & Growing Conditions
Today
87°F
Sunny
Sunny, with a high near 87. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 mph S | 0% |
| Tonight | 66°F | Mostly Clear | 6 mph SE | 0% |
| Wednesday | 89°F | Sunny | 3 to 7 mph S | 13% |
| Wednesday Night | 69°F | Chance Showers And Thunderstorms | 7 mph S | 78% |
| Thursday | 85°F | Showers And Thunderstorms | 7 mph S | 78% |
| Thursday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 23% |
| Friday | 85°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 5 mph SW | 22% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 5 mph S | 30% |
| Saturday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 6 mph S | 30% |
| Saturday Night | 71°F | Mostly Clear | 6 mph S | 7% |
| Sunday | 91°F | Sunny | 6 to 10 mph S | 6% |
| Sunday Night | 73°F | Mostly Clear | 9 mph S | 5% |
| Monday | 92°F | Mostly Sunny | 9 mph SW | 5% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 8 mph S | 18% |
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 Aug 4, 2026.