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
73°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 73, with temperatures falling to around 66 in the afternoon. South wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 100%.
7-day forecast for Gray Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Light Rain | 14 mph S | 98% |
| Tonight | 51°F | Light Rain Likely | 9 mph SW | 67% |
| Wednesday | 61°F | Mostly Cloudy | 5 to 9 mph W | 2% |
| Wednesday Night | 40°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 64°F | Sunny | 6 mph W | 2% |
| Thursday Night | 41°F | Mostly Cloudy | 3 mph NW | 11% |
| Friday | 56°F | Mostly Cloudy | 6 mph NW | 2% |
| Friday Night | 37°F | Mostly Cloudy | 2 mph N | 2% |
| Saturday | 55°F | Partly Sunny | 1 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 1 mph NW | 2% |
| Sunday | 61°F | Sunny | 3 mph W | 8% |
| Sunday Night | 34°F | Mostly Clear | 1 mph W | 3% |
| Monday | 65°F | Sunny | 3 mph W | 1% |
| Monday Night | 38°F | Mostly Clear | 2 mph W | 1% |
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 Nov 3, 2026.