Brighton, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brighton, a city in Jefferson County, Iowa.
This Afternoon
70°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 70, with temperatures falling to around 66 in the afternoon. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
7-day forecast for Brighton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Showers And Thunderstorms Likely | 15 mph S | 69% |
| Tonight | 49°F | Chance Rain Showers | 10 to 15 mph S | 38% |
| Wednesday | 53°F | Slight Chance Rain Showers | 15 mph SW | 21% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 to 15 mph SW | 8% |
| Thursday | 53°F | Chance Rain Showers | 10 to 15 mph W | 29% |
| Thursday Night | 41°F | Chance Rain Showers then Mostly Cloudy | 10 mph NW | 34% |
| Friday | 52°F | Partly Sunny | 5 to 10 mph N | 11% |
| Friday Night | 34°F | Mostly Cloudy | 0 to 5 mph NW | 0% |
| Saturday | 53°F | Partly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 3% |
| Monday | 64°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Brighton (41.175, -91.821). Updated through the day.
Growing snapshot for Brighton
Last spring frost
Apr 28
First fall frost
Oct 11
Growing season
165 days
Hardiness zone
5b
More local growing data for Brighton: nearby ZIP 52540 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Washington, Ia (10.6 mi from Brighton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.