San Leon, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Leon, a community in Galveston County, Texas.
This Afternoon
83°F
Showers And Thunderstorms
Showers and thunderstorms before 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 83, with temperatures falling to around 77 in the afternoon. West wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for San Leon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Showers And Thunderstorms | 10 mph W | 76% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 15 mph NW | 37% |
| Wednesday | 76°F | Sunny | 5 to 15 mph N | 0% |
| Wednesday Night | 65°F | Mostly Clear | 0 to 5 mph E | 2% |
| Thursday | 78°F | Mostly Sunny then Chance Rain Showers | 5 mph E | 28% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms | 0 to 15 mph W | 43% |
| Friday | 78°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 15 mph N | 15% |
| Friday Night | 65°F | Partly Cloudy | 5 to 15 mph N | 2% |
| Saturday | 72°F | Mostly Sunny | 10 to 15 mph NE | 13% |
| Saturday Night | 62°F | Partly Cloudy | 10 to 15 mph N | 30% |
| Sunday | 69°F | Mostly Sunny | 10 to 15 mph N | 15% |
| Sunday Night | 60°F | Mostly Clear | 10 mph N | 4% |
| Monday | 70°F | Sunny | 5 to 10 mph NE | 3% |
| Monday Night | 61°F | Mostly Clear | 5 mph NE | 1% |
Forecast source: National Weather Service (api.weather.gov) for San Leon (29.491, -94.941). Updated through the day.
Growing snapshot for San Leon
Last spring frost
Jan 31
First fall frost
Dec 14
Growing season
317 days
Hardiness zone
9b
More local growing data for San Leon: nearby ZIP 77518 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Bacliff
Bayou Vista
Bolivar Peninsula
Clear Lake Shores
Dickinson
Friendswood
Galveston
Hitchcock
Jamaica Beach
Kemah
La Marque
League City
Santa Fe
Texas City
Tiki Island
Climate data from the nearest NOAA station, Houston Nwso, Tx (6.3 mi from San Leon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.