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Weather & Climate in Bay St. Louis, MS
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Bay St. Louis enjoys a temperate climate with an average annual temperature of 67°F (19°C). Winters average 51°F in January while summers reach 81°F in July. The area gets 313 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 65.0 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 10 feet.
Temperature
51°F Jan (10°C)
81°F Jul (27°C)
| Annual Average | 67.0°F |
| 24% above US avg | |
| January Average | 51°F (10°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 313 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 26.6 sq mi (68.9 km²) |
| Population Density | 679/sq mi |
| Coordinates | 30.3234°N, 89.3588°W |
| Timezone | America/Chicago |
| County | Hancock County County |
| Nearest Airport | Gulfport-Biloxi International (GPT) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.7 / 100 |
| Social Vulnerability | 74.7 / 100 |
| Community Resilience | 73.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
3 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| Feb 18, 2011 | 22 km SSE of Dauphin Island, Alabama | M3.5 | 133 km | 5 km |
| Oct 18, 1997 | 69 km SSW of Dauphin Island, Alabama | M2.9 | 121 km | 1 km |
| Nov 10, 2012 | 16 km S of Dauphin Island, Alabama | M2.6 | 124 km | 11 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
23 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Francine | Category 2 | 104 mph | 169 km |
| 2021 | Ida | Category 4 | 150 mph | 128 km |
| 2020 | Zeta | Category 3 | 115 mph | 54 km |
| 2020 | Sally | Category 2 | 109 mph | 148 km |
| 2019 | Barry | Category 1 | 75 mph | 270 km |
| 2017 | Nate | Category 1 | 86 mph | 36 km |
| 2012 | Isaac | Category 1 | 81 mph | 149 km |
| 2009 | Ida | Category 1 | 86 mph | 213 km |
| 2008 | Gustav | Category 2 | 109 mph | 180 km |
| 2005 | Katrina | Category 4 | 144 mph | 23 km |
| 2005 | Dennis | Category 4 | 138 mph | 204 km |
| 2005 | Cindy | Category 1 | 75 mph | 144 km |
| 2004 | Ivan | Category 4 | 132 mph | 141 km |
| 2002 | Lili | Category 3 | 121 mph | 285 km |
| 1998 | Georges | Category 2 | 109 mph | 45 km |
| 1998 | Earl | Category 2 | 98 mph | 229 km |
| 1997 | Danny | Category 1 | 81 mph | 78 km |
| 1995 | Opal | Category 4 | 127 mph | 201 km |
| 1995 | Erin | Category 2 | 98 mph | 181 km |
| 1992 | Andrew | Category 4 | 144 mph | 218 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
551 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 15 fatalities, 464 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 22, 2022 | EF3 | 83 km | 11.5 mi | 1 |
| Feb 7, 2017 | EF3 | 71 km | 10.1 mi | 0 |
| Jan 21, 2017 | EF3 | 97 km | 31.1 mi | 4 |
| Dec 25, 2012 | EF3 | 48 km | 60.3 mi | 0 |
| May 26, 2011 | EF3 | 74 km | 6.1 mi | 0 |
| Mar 20, 1983 | EF3 | 96 km | 2.0 mi | 0 |
| May 19, 1980 | EF3 | 18 km | 10.6 mi | 0 |
| May 19, 1980 | EF3 | 14 km | 13.1 mi | 0 |
| May 19, 1980 | EF3 | 93 km | 4.3 mi | 0 |
| May 16, 1980 | EF3 | 21 km | 11.5 mi | 0 |
| Apr 13, 1980 | EF3 | 25 km | 15.9 mi | 0 |
| Mar 27, 1976 | EF3 | 98 km | 13.9 mi | 0 |
| Nov 3, 1968 | EF3 | 27 km | 2.0 mi | 0 |
| Oct 30, 1967 | EF3 | 28 km | 2.0 mi | 4 |
| Apr 18, 1966 | EF3 | 45 km | 23.8 mi | 0 |
| Apr 10, 2024 | EF2 | 45 km | 11.0 mi | 0 |
| Jun 19, 2023 | EF2 | 76 km | 2.4 mi | 0 |
| Dec 14, 2022 | EF2 | 89 km | 10.6 mi | 0 |
| Mar 30, 2022 | EF2 | 99 km | 2.1 mi | 0 |
| Mar 30, 2022 | EF2 | 67 km | 11.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: WHITE DOG (12,306 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | WHITE DOG | 12,306 | 91 km |
| 2008 | UNNAMED | 10,363 | 86 km |
| 2013 | UNNAMED | 10,170 | 89 km |
| 2014 | UNNAMED | 9,932 | 91 km |
| 2010 | DESOTO 0902 | 8,713 | 90 km |
| 2013 | UNNAMED | 7,660 | 60 km |
| 2010 | DESOTO 1057 | 7,148 | 62 km |
| 2015 | UNNAMED | 7,059 | 88 km |
| 2014 | UNNAMED | 6,802 | 90 km |
| 2005 | UNNAMED | 6,712 | 99 km |
| 2000 | COW PEN | 6,502 | 91 km |
| 2010 | CRIPPLE CHINOOK | 6,035 | 91 km |
| 2005 | UNNAMED | 5,819 | 98 km |
| 2018 | UNNAMED | 5,803 | 90 km |
| 2010 | DESOTO 1064 | 5,695 | 58 km |
| 2008 | UNNAMED | 5,657 | 97 km |
| 1987 | MACHINE GUN | 5,601 | 90 km |
| 1990 | PIERCES CREEK | 5,544 | 90 km |
| 2020 | 369 D | 5,362 | 95 km |
| 2014 | UNNAMED | 5,230 | 53 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (10°C) | 6.2 in | Coldest |
| February | 54°F (12°C) | 5.4 in | |
| March | 60°F (16°C) | 6.1 in | |
| April | 66°F (19°C) | 4.9 in | |
| May | 74°F (23°C) | 5.2 in | |
| June | 79°F (26°C) | 5.1 in | |
| July | 81°F (27°C) | 6.4 in | Warmest, Wettest |
| August | 81°F (27°C) | 6.1 in | |
| September | 78°F (26°C) | 6.0 in | |
| October | 69°F (20°C) | 3.0 in | Driest |
| November | 60°F (16°C) | 4.8 in | |
| December | 54°F (12°C) | 5.0 in |
Bay St. Louis has a seasonal temperature swing of 31°F / from 51°F in January to 81°F in July. Total annual precipitation is 64.1 inches, with July being the wettest month (6.4") and October the driest (3.0").