Gray Summit, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gray Summit, a community in Franklin County, Missouri.
Today
88°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny, with a high near 88. South wind around 1 mph.
7-day forecast for Gray Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Patchy Fog then Sunny | 1 mph S | 0% |
| Tonight | 67°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 89°F | Sunny | 2 mph S | 11% |
| Wednesday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph S | 66% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 3 mph S | 68% |
| Thursday Night | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 1 mph SE | 34% |
| Friday | 86°F | Chance Showers And Thunderstorms | 1 mph SW | 34% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 1 mph S | 28% |
| Saturday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 1 mph SW | 28% |
| Saturday Night | 71°F | Mostly Clear | 2 mph S | 6% |
| Sunday | 91°F | Sunny | 3 mph SW | 4% |
| Sunday Night | 73°F | Mostly Clear | 3 mph S | 5% |
| Monday | 92°F | Sunny | 5 mph SW | 5% |
| Monday Night | 74°F | Mostly Clear | 5 mph S | 13% |
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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Parkway
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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 Aug 4, 2026.