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Weather & Climate in Portstewart, United Kingdom
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Portstewart experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 42°F in January while summers reach 58°F in July / relatively mild seasonal variation. The area gets 247 sunny days per year, above the national average. Annual precipitation totals 49.1 inches (wetter than the 38-inch national average). The city sits at an elevation of 85 feet.
Temperature
42°F Jan (5°C)
58°F Jul (15°C)
| Annual Average | 49.2°F |
| 9% below US avg | |
| January Average | 42°F (5°C) |
| July Average | 58°F (15°C) |
| Sunny Days | 247 days/yr |
Geography
| Elevation | 85 ft (26 m) |
| Area | 1,043.6 sq mi (2,702.8 km²) |
| Population Density | 8/sq mi |
| Coordinates | 55.1813°N, 6.7140°W |
| Timezone | Europe/London |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| May 3, 1998 | Scotland, United Kingdom | M3.5 | 107 km | 15 km |
| Jan 26, 1990 | 34 km N of Isle of Islay, United Kingdom | M3.0 | 105 km | 10 km |
| Aug 27, 1992 | 33 km NNE of Isle of Islay, United Kingdom | M2.7 | 107 km | 10 km |
| Nov 1, 2017 | 2 km NNW of Tarbert, United Kingdom | M2.6 | 112 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 720 | HEBRIDES (SCOTLAND) | Questionable Earthquake | — | — | 129 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 5.4 in | Wettest |
| February | 41°F (5°C) | 4.2 in | Coldest |
| March | 44°F (6°C) | 4.1 in | |
| April | 46°F (8°C) | 2.9 in | |
| May | 51°F (11°C) | 2.6 in | Driest |
| June | 55°F (13°C) | 2.9 in | |
| July | 58°F (15°C) | 3.1 in | |
| August | 59°F (15°C) | 3.9 in | Warmest |
| September | 55°F (13°C) | 4.3 in | |
| October | 51°F (10°C) | 5.2 in | |
| November | 46°F (8°C) | 5.3 in | |
| December | 43°F (6°C) | 5.2 in |
Portstewart has a seasonal temperature swing of 17°F / from 41°F in February to 59°F in August. Total annual precipitation is 49.1 inches, with January being the wettest month (5.4") and May the driest (2.6").