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Weather & Climate in St. Marys, GA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Marys enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 50°F in January while summers reach 81°F in July. The area gets 306 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 54.6 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 44. The city sits at an elevation of 24 feet.
Temperature
50°F Jan (10°C)
81°F Jul (27°C)
| Annual Average | 66.4°F |
| 23% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 306 days/yr |
Geography
| Elevation | 24 ft (7 m) |
| Area | 24.9 sq mi (64.5 km²) |
| Population Density | 737/sq mi |
| Coordinates | 30.7542°N, 81.5726°W |
| Timezone | America/New_York |
| County | Camden County County |
| Nearest Airport | Jacksonville International (JAX) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 44.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 54.6 / 100 |
| Social Vulnerability | 23.2 / 100 |
| Community Resilience | 54.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Hurricane History
21 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Helene | Category 4 | 138 mph | 175 km |
| 2024 | Milton | Category 1 | 81 mph | 265 km |
| 2024 | Debby | Category 1 | 81 mph | 200 km |
| 2023 | Idalia | Category 4 | 132 mph | 118 km |
| 2022 | Ian | Category 1 | 86 mph | 242 km |
| 2020 | Isaias | Category 1 | 92 mph | 185 km |
| 2019 | Dorian | Category 3 | 115 mph | 179 km |
| 2018 | Michael | Category 1 | 92 mph | 267 km |
| 2017 | Irma | Category 1 | 75 mph | 290 km |
| 2016 | Matthew | Category 3 | 121 mph | 93 km |
| 2016 | Hermine | Category 1 | 81 mph | 238 km |
| 2014 | Arthur | Category 1 | 92 mph | 229 km |
| 2004 | Charley | Category 1 | 86 mph | 104 km |
| 1999 | Floyd | Category 3 | 127 mph | 237 km |
| 1999 | Dennis | Category 2 | — | 299 km |
| 1999 | Irene | Category 1 | 81 mph | 170 km |
| 1996 | Bertha | Category 1 | 81 mph | 288 km |
| 1989 | Hugo | Category 4 | 138 mph | 276 km |
| 1985 | Kate | Category 1 | 75 mph | 201 km |
| 1985 | Bob | Category 1 | 75 mph | 106 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
284 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 1 fatality, 110 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 11, 2008 | EF4 | 74 km | 11.0 mi | 0 |
| Dec 2, 2018 | EF3 | 4 km | 7.1 mi | 0 |
| Feb 7, 1971 | EF3 | 95 km | 13.1 mi | 0 |
| Nov 18, 1968 | EF3 | 83 km | 0.5 mi | 0 |
| Mar 9, 2024 | EF2 | 60 km | 4.7 mi | 0 |
| Apr 15, 2007 | EF2 | 69 km | 1.5 mi | 0 |
| Mar 22, 2005 | EF2 | 91 km | 2.0 mi | 0 |
| Aug 12, 2004 | EF2 | 38 km | 7.0 mi | 0 |
| Mar 29, 2001 | EF2 | 100 km | 12.0 mi | 0 |
| Feb 2, 1996 | EF2 | 50 km | 6.0 mi | 0 |
| Oct 2, 1994 | EF2 | 4 km | 0.2 mi | 0 |
| Feb 27, 1984 | EF2 | 11 km | 3.0 mi | 0 |
| Mar 18, 1975 | EF2 | 96 km | 1.0 mi | 0 |
| May 12, 1974 | EF2 | 74 km | 17.5 mi | 0 |
| May 12, 1974 | EF2 | 76 km | 4.3 mi | 0 |
| Feb 7, 1971 | EF2 | 100 km | 2.0 mi | 0 |
| Feb 25, 1970 | EF2 | 100 km | 10.9 mi | 0 |
| Jun 6, 1964 | EF2 | 41 km | 3.6 mi | 0 |
| Feb 24, 1963 | EF2 | 52 km | 1.0 mi | 0 |
| Jan 13, 1963 | EF2 | 68 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BIG TURNAROUND COMPLEX (328,827 acres, 2007).
| Year | Name | Acres Burned | Distance |
| 2007 | BIG TURNAROUND COMPLEX | 328,827 | 78 km |
| 2007 | BIG TURNAROUND COMPLEX (FLOYDS ISLAND PRAIRIE) | 215,381 | 74 km |
| 2017 | WEST MIMS | 166,737 | 70 km |
| 2011 | HONEY PRAIRIE | 147,065 | 70 km |
| 2011 | CRAVENS HAMMOCK | 142,688 | 72 km |
| 2002 | BLACKJACK BAY COMPLEX | 107,076 | 72 km |
| 1999 | FRIENDLY | 75,089 | 82 km |
| 2007 | SWEAT FARM ROAD | 52,495 | 91 km |
| 2012 | COUNTY LINE | 35,440 | 89 km |
| 2004 | IMPASSABLE ONE | 29,836 | 87 km |
| 1990 | SHORTS | 21,413 | 81 km |
| 2011 | GA-19 (SAW FLY RD) | 19,730 | 65 km |
| 2011 | DURDIN PRAIRIE | 19,487 | 59 km |
| 1998 | UNNAMED | 16,594 | 62 km |
| 1989 | PIN HOOK | 16,471 | 85 km |
| 1999 | HICKORY IS | 14,656 | 77 km |
| 2014 | UNNAMED | 14,543 | 90 km |
| 1998 | UNNAMED | 13,873 | 96 km |
| 2002 | BAY CREEK | 11,917 | 85 km |
| 2011 | IMPASSABLE BAY | 11,889 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 3.8 in | Coldest |
| February | 55°F (13°C) | 3.4 in | |
| March | 61°F (16°C) | 4.1 in | |
| April | 67°F (19°C) | 2.9 in | |
| May | 74°F (23°C) | 3.2 in | |
| June | 79°F (26°C) | 5.5 in | |
| July | 81°F (27°C) | 5.8 in | |
| August | 81°F (27°C) | 6.3 in | Warmest |
| September | 78°F (26°C) | 6.9 in | Wettest |
| October | 70°F (21°C) | 3.8 in | |
| November | 62°F (17°C) | 2.4 in | Driest |
| December | 55°F (13°C) | 2.8 in |
St. Marys has a seasonal temperature swing of 31°F / from 50°F in January to 81°F in August. Total annual precipitation is 51.0 inches, with September being the wettest month (6.9") and November the driest (2.4").