Grand Blanc, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Blanc, a city in Genesee County, Michigan.
Today
87°F
Sunny
Sunny, with a high near 87. Southwest wind around 8 mph.
7-day forecast for Grand Blanc
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 8 mph SW | 0% |
| Tonight | 61°F | Mostly Clear | 8 mph SSW | 0% |
| Wednesday | 88°F | Mostly Sunny | 6 to 10 mph SW | 9% |
| Wednesday Night | 64°F | Slight Chance Showers And Thunderstorms | 2 to 9 mph WSW | 71% |
| Thursday | 81°F | Showers And Thunderstorms Likely | 2 to 6 mph WSW | 71% |
| Thursday Night | 62°F | Showers And Thunderstorms Likely | 1 to 5 mph SE | 57% |
| Friday | 85°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 26% |
| Friday Night | 63°F | Chance Showers And Thunderstorms then Mostly Clear | 5 mph SW | 26% |
| Saturday | 88°F | Sunny | 3 to 9 mph SW | 5% |
| Saturday Night | 66°F | Chance Rain Showers | 3 to 8 mph SW | 29% |
| Sunday | 89°F | Chance Rain Showers | 6 to 13 mph SW | 29% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 6 to 12 mph WSW | 49% |
| Monday | 86°F | Chance Rain Showers | 6 to 9 mph WSW | 49% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 5 to 8 mph WSW | 45% |
Forecast source: National Weather Service (api.weather.gov) for Grand Blanc (42.933, -83.620). Updated through the day.
Growing snapshot for Grand Blanc
Last spring frost
May 1
First fall frost
Oct 14
Growing season
164 days
Hardiness zone
6a
More local growing data for Grand Blanc: nearby ZIP 48439 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Argentine
Beecher
Burton
Clio
Davison
Flint
Flushing
Gaines
Goodrich
Linden
Montrose
Mount Morris
Otisville
Swartz Creek
Climate data from the nearest NOAA station, Goodrich, Mi (6.2 mi from Grand Blanc). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.