San Leon, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Leon, a community in Galveston County, Texas.
Tonight
65°F
Partly Cloudy
Partly cloudy, with a low around 65. North wind around 15 mph, with gusts as high as 20 mph. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for San Leon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Partly Cloudy | 15 mph N | 1% |
| 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% |
| Tuesday | 72°F | Sunny | 5 mph E | 2% |
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.