All Countries
Weather & Climate in St Johnston, Ireland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St Johnston experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 41°F in January while summers reach 59°F in July / relatively mild seasonal variation. The area gets 229 sunny days per year, above the national average. Annual precipitation totals 59.2 inches (wetter than the 38-inch national average). The city sits at an elevation of 20 feet.
Temperature
41°F Jan (5°C)
59°F Jul (15°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 59°F (15°C) |
| Sunny Days | 229 days/yr |
Geography
| Elevation | 20 ft (6 m) |
| Area | 0.5 sq mi (1.2 km²) |
| Population Density | 1,137/sq mi |
| Coordinates | 54.9355°N, 7.4611°W |
| Timezone | Europe/Dublin |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.0.
| Jan 26, 1990 | 34 km N of Isle of Islay, United Kingdom | M3.0 | 148 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 6.0 in | Coldest |
| February | 41°F (5°C) | 4.3 in | |
| March | 44°F (6°C) | 4.6 in | |
| April | 47°F (8°C) | 3.5 in | |
| May | 51°F (11°C) | 3.2 in | Driest |
| June | 55°F (13°C) | 3.6 in | |
| July | 59°F (15°C) | 4.1 in | Warmest |
| August | 59°F (15°C) | 4.8 in | |
| September | 55°F (13°C) | 5.5 in | |
| October | 50°F (10°C) | 6.4 in | |
| November | 45°F (7°C) | 6.7 in | Wettest |
| December | 42°F (6°C) | 6.6 in |
St Johnston has a seasonal temperature swing of 18°F / from 41°F in January to 59°F in July. Total annual precipitation is 59.2 inches, with November being the wettest month (6.7") and May the driest (3.2").