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Weather & Climate in San Leon, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
San Leon has a warm climate with an average annual temperature of 71°F (22°C). Winters average 56°F in January while summers reach 85°F in July. The area gets 319 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 8 feet.
Temperature
56°F Jan (13°C)
85°F Jul (29°C)
| Annual Average | 71.4°F |
| 32% above US avg | |
| January Average | 56°F (13°C) |
| July Average | 85°F (29°C) |
| Sunny Days | 319 days/yr |
Geography
| Elevation | 8 ft (2 m) |
| Area | 4.8 sq mi (12.3 km²) |
| Population Density | 1,213/sq mi |
| Coordinates | 29.4911°N, 94.9414°W |
| Timezone | America/Chicago |
| County | Galveston County County |
| Nearest Airport | Scholes International At Galveston (GLS) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.4 / 100 |
| Social Vulnerability | 32.4 / 100 |
| Community Resilience | 97.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Very High |
| Ice Storm | Relatively High |
| Drought | Relatively High |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Hurricane History
19 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Francine | Category 2 | 98 mph | 274 km |
| 2024 | Beryl | Category 1 | 92 mph | 105 km |
| 2021 | Nicholas | Category 1 | 75 mph | 107 km |
| 2020 | Laura | Category 4 | 150 mph | 162 km |
| 2020 | Delta | Category 3 | 115 mph | 151 km |
| 2020 | Hanna | Category 1 | 92 mph | 274 km |
| 2019 | Barry | Category 1 | 75 mph | 266 km |
| 2017 | Harvey | Category 4 | 132 mph | 246 km |
| 2008 | Ike | Category 2 | 109 mph | 24 km |
| 2007 | Humberto | Category 1 | 92 mph | 46 km |
| 2005 | Rita | Category 4 | 127 mph | 119 km |
| 2003 | Claudette | Category 1 | 92 mph | 143 km |
| 2002 | Lili | Category 1 | 92 mph | 261 km |
| 1989 | Jerry | Category 1 | 86 mph | 33 km |
| 1989 | Chantal | Category 1 | 81 mph | 54 km |
| 1986 | Bonnie | Category 1 | 86 mph | 73 km |
| 1985 | Juan | Category 1 | 86 mph | 189 km |
| 1985 | Danny | Category 1 | 92 mph | 217 km |
| 1983 | Alicia | Category 3 | 115 mph | 36 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
673 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 25 fatalities, 742 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 21, 1992 | EF4 | 42 km | 30.0 mi | 0 |
| Sep 12, 1961 | EF4 | 25 km | 1.0 mi | 8 |
| Dec 28, 2024 | EF3 | 29 km | 67.9 mi | 0 |
| Dec 28, 2024 | EF3 | 82 km | 10.3 mi | 0 |
| Jan 24, 2023 | EF3 | 32 km | 23.3 mi | 0 |
| Mar 30, 2002 | EF3 | 16 km | 0.7 mi | 0 |
| Jan 1, 1999 | EF3 | 74 km | 5.5 mi | 0 |
| Nov 21, 1992 | EF3 | 60 km | 32.0 mi | 0 |
| Feb 5, 1986 | EF3 | 84 km | 5.0 mi | 2 |
| Jan 31, 1983 | EF3 | 98 km | 1.0 mi | 0 |
| Dec 13, 1977 | EF3 | 46 km | 25.1 mi | 1 |
| Mar 8, 1976 | EF3 | 49 km | 12.7 mi | 0 |
| Oct 28, 1974 | EF3 | 24 km | 3.3 mi | 1 |
| Oct 28, 1974 | EF3 | 57 km | 9.6 mi | 1 |
| Sep 13, 1974 | EF3 | 79 km | 3.6 mi | 0 |
| Sep 8, 1969 | EF3 | 36 km | 0.8 mi | 0 |
| May 27, 1969 | EF3 | 40 km | 1.5 mi | 3 |
| Mar 23, 1969 | EF3 | 71 km | 0.5 mi | 0 |
| Aug 18, 1967 | EF3 | 8 km | 0.5 mi | 0 |
| Apr 18, 1966 | EF3 | 68 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: 08 UNIT 1 RX (16,981 acres, 2007).
| Year | Name | Acres Burned | Distance |
| 2007 | 08 UNIT 1 RX | 16,981 | 68 km |
| 2010 | MCR UNIT 2 RX | 14,471 | 76 km |
| 2000 | E WHITES 2 | 13,996 | 73 km |
| 2012 | WF HOLIDAY 1-2 | 13,251 | 74 km |
| 2005 | RX UNIT 12 1117 2005 | 10,728 | 74 km |
| 1997 | WILD COW BAY | 10,069 | 89 km |
| 2020 | TXMCR-FY20-RX-W | 10,033 | 85 km |
| 2023 | H AND H COMPLEX | 9,476 | 91 km |
| 1992 | UNNAMED | 9,344 | 75 km |
| 2003 | UNIT 8 WILDFIRE | 9,076 | 88 km |
| 1986 | STAR LAKE | 8,876 | 75 km |
| 2015 | WF UNIT 1 1/2 | 8,840 | 73 km |
| 1997 | GRIT ROAD | 8,599 | 85 km |
| 1989 | UNNAMED | 8,539 | 64 km |
| 1994 | UNIT1ARSON | 8,287 | 69 km |
| 1997 | MCF WEST | 7,786 | 76 km |
| 1993 | UNNAMED | 7,714 | 64 km |
| 2017 | WF PERKINS BLOWOUT | 7,646 | 74 km |
| 1990 | PERKINS | 6,969 | 82 km |
| 2015 | WF WEST END 2015 | 6,590 | 59 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 56°F (13°C) | 3.9 in | Coldest |
| February | 56°F (13°C) | 2.8 in | Driest |
| March | 63°F (17°C) | 2.8 in | |
| April | 69°F (20°C) | 2.9 in | |
| May | 76°F (24°C) | 4.2 in | |
| June | 81°F (27°C) | 5.0 in | |
| July | 85°F (29°C) | 4.3 in | Warmest |
| August | 83°F (28°C) | 4.1 in | |
| September | 80°F (26°C) | 6.3 in | Wettest |
| October | 72°F (22°C) | 3.7 in | |
| November | 63°F (17°C) | 4.0 in | |
| December | 56°F (13°C) | 3.7 in |
San Leon has a seasonal temperature swing of 29°F / from 56°F in January to 85°F in July. Total annual precipitation is 47.4 inches, with September being the wettest month (6.3") and February the driest (2.8").