Byron, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Byron, a city in Olmsted County, Minnesota.
Tonight
57°F
Showers And Thunderstorms then Chance Showers And Thunderstorms
Showers and thunderstorms before midnight, then a chance of showers and thunderstorms between midnight and 3am, then showers and thunderstorms likely. Some of the storms could produce heavy rain. Cloudy, with a low around 57. East wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 to 16 mph E | 90% |
| Saturday | 65°F | Showers And Thunderstorms Likely | 10 mph NE | 69% |
| Saturday Night | 54°F | Chance Showers And Thunderstorms | 12 mph NE | 28% |
| Sunday | 65°F | Mostly Cloudy | 14 mph NE | 8% |
| Sunday Night | 48°F | Mostly Cloudy | 12 mph E | 8% |
| Monday | 61°F | Mostly Cloudy then Chance Rain Showers | 10 mph E | 32% |
| Monday Night | 44°F | Chance Rain Showers | 6 to 9 mph E | 32% |
| Tuesday | 60°F | Partly Sunny | 8 mph E | 9% |
| Tuesday Night | 43°F | Partly Cloudy | 6 mph E | 3% |
| Wednesday | 64°F | Sunny | 6 mph SE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 5 mph SE | 7% |
| Thursday | 67°F | Mostly Sunny | 5 mph S | 11% |
| Thursday Night | 51°F | Partly Cloudy | 5 mph S | 7% |
| Friday | 69°F | Mostly Sunny | 3 to 7 mph SE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Byron (44.038, -92.641). Updated through the day.
Growing snapshot for Byron
Last spring frost
May 12
First fall frost
Sep 28
Growing season
139 days
Hardiness zone
4b
More local growing data for Byron: nearby ZIP 55920 weather · frost dates · planting calendar · Minnesota frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Byron 4North, Mn (5.5 mi from Byron). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.