Byron, MN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Byron, a city in Olmsted County, Minnesota.
Today
73°F
Showers And Thunderstorms
Showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms between 1pm and 2pm, then showers and thunderstorms likely. Mostly cloudy. High near 73, with temperatures falling to around 71 in the afternoon. West wind 8 to 12 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Showers And Thunderstorms | 8 to 12 mph W | 85% |
| Tonight | 55°F | Rain Showers Likely | 5 to 9 mph W | 65% |
| Wednesday | 75°F | Mostly Sunny | 2 to 6 mph NW | 1% |
| Wednesday Night | 55°F | Mostly Clear | 5 mph SW | 0% |
| Thursday | 78°F | Sunny | 5 to 10 mph SW | 0% |
| Thursday Night | 61°F | Mostly Clear | 10 mph S | 1% |
| Friday | 81°F | Sunny | 9 to 14 mph SW | 13% |
| Friday Night | 64°F | Mostly Clear | 9 to 13 mph SW | 14% |
| Saturday | 82°F | Sunny | 8 to 12 mph S | 11% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 9 to 13 mph SW | 41% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 10 mph SW | 41% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph NE | 36% |
| Monday | 81°F | Chance Showers And Thunderstorms | 9 mph E | 36% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms | 9 mph N | 24% |
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 Aug 4, 2026.