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Weather & Climate in Sienna, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sienna enjoys a temperate climate with an average annual temperature of 70°F (21°C). Winters average 53°F in January while summers reach 83°F in July. The area gets 314 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 50.2 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 57 feet.
Temperature
53°F Jan (12°C)
83°F Jul (28°C)
| Annual Average | 69.5°F |
| 29% above US avg | |
| January Average | 53°F (12°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 314 days/yr |
Geography
| Elevation | 57 ft (17 m) |
| Area | 13.7 sq mi (35.4 km²) |
| Population Density | 1,989/sq mi |
| Coordinates | 29.4854°N, 95.5063°W |
| Timezone | America/Chicago |
| County | Fort Bend County County |
| Nearest Airport | Sugar Land Regional (SGR) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.5 / 100 |
| Social Vulnerability | 17.0 / 100 |
| Community Resilience | 70.1 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Low |
| Lightning | Very High |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| Feb 19, 2015 | 3 km N of Hallettsville, Texas | M3.1 | 139 km | 5 km |
| Jan 4, 1995 | 1 km NW of Hallettsville, Texas | M2.7 | 140 km | 5 km |
| Aug 24, 2021 | 3 km NNW of Hallettsville, Texas | M2.6 | 140 km | 5 km |
| Apr 2, 2024 | 4 km SSW of Round Top, Texas | M2.5 | 130 km | 17 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
16 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Beryl | Category 1 | 92 mph | 52 km |
| 2021 | Nicholas | Category 1 | 75 mph | 79 km |
| 2020 | Laura | Category 4 | 150 mph | 216 km |
| 2020 | Delta | Category 3 | 115 mph | 205 km |
| 2020 | Hanna | Category 1 | 92 mph | 265 km |
| 2017 | Harvey | Category 4 | 132 mph | 195 km |
| 2008 | Ike | Category 2 | 109 mph | 63 km |
| 2007 | Humberto | Category 1 | 92 mph | 93 km |
| 2005 | Rita | Category 3 | 121 mph | 171 km |
| 2003 | Claudette | Category 1 | 92 mph | 132 km |
| 1989 | Chantal | Category 1 | 81 mph | 108 km |
| 1989 | Jerry | Category 1 | 86 mph | 58 km |
| 1986 | Bonnie | Category 1 | 86 mph | 125 km |
| 1985 | Danny | Category 1 | 92 mph | 272 km |
| 1985 | Juan | Category 1 | 86 mph | 244 km |
| 1983 | Alicia | Category 3 | 115 mph | 22 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
792 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 28 fatalities, 790 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 21, 1992 | EF4 | 35 km | 30.0 mi | 0 |
| Sep 12, 1961 | EF4 | 73 km | 1.0 mi | 8 |
| Dec 28, 2024 | EF3 | 76 km | 10.3 mi | 0 |
| Dec 28, 2024 | EF3 | 80 km | 67.9 mi | 0 |
| Jan 24, 2023 | EF3 | 28 km | 23.3 mi | 0 |
| Mar 30, 2002 | EF3 | 49 km | 0.7 mi | 0 |
| Nov 21, 1992 | EF3 | 72 km | 32.0 mi | 0 |
| Feb 5, 1986 | EF3 | 61 km | 5.0 mi | 2 |
| Dec 13, 1977 | EF3 | 39 km | 25.1 mi | 1 |
| Mar 8, 1976 | EF3 | 15 km | 12.7 mi | 0 |
| Oct 28, 1974 | EF3 | 53 km | 3.3 mi | 1 |
| Sep 13, 1974 | EF3 | 26 km | 3.6 mi | 0 |
| Sep 8, 1969 | EF3 | 37 km | 0.8 mi | 0 |
| May 27, 1969 | EF3 | 85 km | 1.5 mi | 3 |
| Apr 11, 1969 | EF3 | 78 km | 2.0 mi | 0 |
| Dec 12, 1968 | EF3 | 93 km | 6.2 mi | 0 |
| Sep 20, 1967 | EF3 | 79 km | 19.9 mi | 0 |
| Sep 20, 1967 | EF3 | 79 km | 19.9 mi | 0 |
| Aug 18, 1967 | EF3 | 57 km | 0.5 mi | 0 |
| Apr 18, 1966 | EF3 | 47 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: RILEY ROAD (18,999 acres, 2011).
| Year | Name | Acres Burned | Distance |
| 2011 | RILEY ROAD | 18,999 | 89 km |
| 2012 | WF FROZEN POINT | 5,738 | 97 km |
| 2017 | TXTMR FY17 RX WHARTON | 5,175 | 47 km |
| 2011 | DYER MILL | 5,170 | 99 km |
| 2010 | WHARTON | 5,084 | 47 km |
| 2005 | YELLOW RAIL PRAIRIE | 4,358 | 96 km |
| 2008 | COW TRAP 2008 | 4,335 | 73 km |
| 2017 | 2018 NORTH SARGENT WF | 3,959 | 76 km |
| 2009 | CHOCOLATE BAYOU UNIT | 3,790 | 44 km |
| 1987 | FRED | 3,635 | 98 km |
| 2020 | CHOCOLATE BAYOU | 3,623 | 44 km |
| 1997 | MOUND | 3,402 | 49 km |
| 2009 | ROAD PASTURE 2009 | 3,197 | 65 km |
| 2011 | BAILEY | 3,136 | 98 km |
| 1992 | SMITH MARSH | 3,057 | 75 km |
| 2006 | CATTAILS | 3,046 | 70 km |
| 2017 | TXAHR FY18 RX DEEP MARSH EAST 17 | 2,609 | 98 km |
| 2023 | TXBRR-FY23-RX-W | 2,511 | 49 km |
| 2017 | TXTMR FY17 RX BLUESTEM | 2,462 | 47 km |
| 2019 | TXTMR-FY19-RX-ALLIGATOR MARSH | 2,435 | 49 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 53°F (12°C) | 3.5 in | Coldest |
| February | 54°F (12°C) | 2.9 in | |
| March | 62°F (16°C) | 2.6 in | Driest |
| April | 67°F (20°C) | 2.9 in | |
| May | 75°F (24°C) | 4.7 in | |
| June | 80°F (27°C) | 5.3 in | |
| July | 83°F (28°C) | 4.4 in | Warmest |
| August | 83°F (28°C) | 4.4 in | |
| September | 79°F (26°C) | 5.8 in | Wettest |
| October | 71°F (22°C) | 3.7 in | |
| November | 62°F (17°C) | 4.1 in | |
| December | 55°F (13°C) | 3.5 in |
Sienna has a seasonal temperature swing of 30°F / from 53°F in January to 83°F in July. Total annual precipitation is 47.7 inches, with September being the wettest month (5.8") and March the driest (2.6").