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Weather & Climate in Brunswick, ME
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Brunswick experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 21°F in January while summers reach 69°F in July. The area gets 259 sunny days per year, above the national average. Annual precipitation totals 50.0 inches (wetter than the 38-inch national average). The area receives 66.8 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 34. The city sits at an elevation of 68 feet.
Temperature
21°F Jan (-6°C)
69°F Jul (21°C)
| Annual Average | 45.7°F |
| 15% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 68 ft (21 m) |
| Area | 16.1 sq mi (41.6 km²) |
| Population Density | 871/sq mi |
| Coordinates | 43.8875°N, 69.9426°W |
| Timezone | America/New_York |
| County | Sagadahoc County County |
| Nearest Airport | Portland International Jetport (PWM) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 23.4 / 100 |
| Social Vulnerability | 20.2 / 100 |
| Community Resilience | 96.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
45 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Oct 16, 2012 | 5 km W of Hollis Center, Maine | M4.7 | 66 km | 16 km |
| Feb 26, 1999 | 0 km NW of China, Maine | M3.8 | 74 km | 3 km |
| Aug 21, 1996 | 12 km N of Livermore, New Hampshire | M3.8 | 117 km | 10 km |
| Jan 27, 2025 | 9 km SE of York Harbor, Maine | M3.8 | 105 km | 11 km |
| Jan 17, 2000 | 4 km NNE of Dixfield, Maine | M3.6 | 86 km | 16 km |
| Jan 3, 2000 | 4 km W of Leeds, Maine | M3.5 | 50 km | 10 km |
| Oct 6, 1992 | 1 km SW of Canterbury, New Hampshire | M3.4 | 146 km | 5 km |
| Jan 14, 2023 | 7 km ESE of Dedham, Maine | M3.3 | 139 km | 10 km |
| Sep 7, 2000 | 7 km WSW of Liberty, Maine | M3.2 | 69 km | 5 km |
| Sep 26, 2010 | 2 km SW of Canterbury, New Hampshire | M3.2 | 147 km | 5 km |
| Sep 5, 1994 | 13 km NNE of Monhegan, Maine | M3.1 | 57 km | 5 km |
| Jan 10, 1999 | 2 km ENE of Merrimac, Massachusetts | M3.1 | 144 km | 2 km |
| Jan 27, 2000 | 3 km WNW of Fremont, New Hampshire | M3.0 | 140 km | 1 km |
| Dec 25, 1999 | 4 km NE of Saint Albans, Maine | M3.0 | 126 km | 5 km |
| Mar 30, 2010 | 7 km WSW of Dedham, Maine | M3.0 | 129 km | 4 km |
| Jan 10, 1999 | 1 km NNE of Merrimac, Massachusetts | M3.0 | 144 km | 2 km |
| Nov 20, 1994 | 4 km WNW of Norway, Maine | M3.0 | 65 km | 5 km |
| Jul 22, 2003 | 72 km NNE of Provincetown, Massachusetts | M3.0 | 143 km | 10 km |
| Feb 4, 2022 | 0 km SSW of Gorham, New Hampshire | M2.9 | 113 km | 8 km |
| Apr 25, 2023 | 4 km SW of Center Sandwich, New Hampshire | M2.9 | 124 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
1 hurricane (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 1991 | Bob | Category 2 | 104 mph | 150 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
68 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 8 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 8, 1996 | EF2 | 44 km | 1.5 mi | 0 |
| Nov 7, 1971 | EF2 | 97 km | 4.1 mi | 0 |
| Jul 31, 1971 | EF2 | 57 km | 2.0 mi | 0 |
| Jul 31, 1971 | EF2 | 72 km | 1.9 mi | 0 |
| Jul 31, 1971 | EF2 | 57 km | 0.5 mi | 0 |
| Oct 10, 1966 | EF2 | 84 km | 0.2 mi | 0 |
| Jul 1, 2017 | EF1 | 65 km | 2.5 mi | 0 |
| Jul 1, 2017 | EF1 | 70 km | 0.3 mi | 0 |
| Jul 1, 2017 | EF1 | 72 km | 1.5 mi | 0 |
| Jul 28, 2014 | EF1 | 64 km | 1.7 mi | 0 |
| Jun 1, 2011 | EF1 | 82 km | 0.3 mi | 0 |
| Jul 21, 2010 | EF1 | 77 km | 2.0 mi | 0 |
| Jul 21, 2010 | EF1 | 82 km | 5.4 mi | 0 |
| Jun 5, 2010 | EF1 | 55 km | 4.2 mi | 0 |
| Aug 21, 2009 | EF1 | 65 km | 16.4 mi | 0 |
| Sep 29, 2006 | EF1 | 92 km | 1.5 mi | 0 |
| Nov 24, 2005 | EF1 | 12 km | 3.8 mi | 0 |
| May 31, 2002 | EF1 | 69 km | 2.1 mi | 0 |
| Jun 17, 2001 | EF1 | 94 km | 0.4 mi | 0 |
| Jul 18, 2000 | EF1 | 92 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2008 | MAINE | Avalanche | 3.6 m | — | 22 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 3.6 in | Coldest |
| February | 24°F (-4°C) | 3.4 in | |
| March | 33°F (0°C) | 4.1 in | |
| April | 43°F (6°C) | 4.1 in | |
| May | 54°F (12°C) | 3.8 in | |
| June | 63°F (17°C) | 3.5 in | |
| July | 69°F (21°C) | 3.1 in | Warmest, Driest |
| August | 68°F (20°C) | 3.4 in | |
| September | 59°F (15°C) | 3.2 in | |
| October | 49°F (9°C) | 3.9 in | |
| November | 39°F (4°C) | 4.7 in | Wettest |
| December | 27°F (-3°C) | 4.5 in |
Brunswick has a seasonal temperature swing of 48°F / from 21°F in January to 69°F in July. Total annual precipitation is 45.2 inches, with November being the wettest month (4.7") and July the driest (3.1").