Gray Summit, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gray Summit, a community in Franklin County, Missouri.
This Afternoon
97°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 97. Heat index values as high as 102. Southwest wind around 1 mph. Chance of precipitation is 30%.
7-day forecast for Gray Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 97°F | Chance Showers And Thunderstorms | 1 mph SW | 26% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 mph SE | 21% |
| Saturday | 96°F | Mostly Sunny | 5 mph SW | 5% |
| Saturday Night | 71°F | Partly Cloudy | 3 mph SW | 2% |
| Sunday | 91°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 mph W | 19% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 mph N | 64% |
| Monday | 78°F | Showers And Thunderstorms Likely | 3 mph N | 69% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph N | 69% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 6 mph N | 23% |
| Tuesday Night | 53°F | Mostly Cloudy | 5 mph N | 6% |
| Wednesday | 72°F | Mostly Sunny | 3 mph N | 1% |
| Wednesday Night | 53°F | Partly Cloudy | 2 mph N | 1% |
| Thursday | 74°F | Mostly Sunny | 3 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 1 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Gray Summit (38.495, -90.815). Updated through the day.
Growing snapshot for Gray Summit
Last spring frost
Apr 8
First fall frost
Oct 25
Growing season
199 days
Hardiness zone
6b
More local growing data for Gray Summit: nearby ZIP 63039 weather · frost dates · planting calendar · Missouri frost dates
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Washington
Climate data from the nearest NOAA station, Washington, Mo (7.9 mi from Gray Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.