Coleraine has a temperate climate with warm summers and cold winters.
Temperatures peak in July and drop to their lowest in January, while rainfall is highest during autumn months.
Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | ☔ | 10.8°C | -0.9°C | 5.0°C | 91% | 107 | 5.5 | 0.50 |
| February | ☔ | 10.4°C | -0.4°C | 5.0°C | 90% | 86 | 5.5 | 1.11 |
| March | ☔ | 12.1°C | -0.0°C | 6.0°C | 89% | 90 | 5.0 | 2.19 |
| April | 🌨️ | 14.7°C | 1.1°C | 7.9°C | 86% | 75 | 4.3 | 3.76 |
| May | 🌤️ | 18.1°C | 3.6°C | 10.8°C | 84% | 78 | 4.0 | 4.91 |
| June | ☔ | 20.2°C | 6.3°C | 13.3°C | 84% | 87 | 3.8 | 4.96 |
| July | ☔ | 21.5°C | 8.4°C | 15.0°C | 86% | 98 | 3.7 | 4.51 |
| August | ☔ | 20.7°C | 8.5°C | 14.6°C | 86% | 107 | 3.9 | 3.77 |
| September | ☔ | 19.3°C | 6.6°C | 13.0°C | 87% | 98 | 4.4 | 2.63 |
| October | ☔ | 16.1°C | 3.9°C | 10.0°C | 89% | 122 | 4.9 | 1.38 |
| November | ☔ | 13.0°C | 1.5°C | 7.2°C | 91% | 110 | 5.0 | 0.63 |
| December | ☔ | 11.3°C | 0.1°C | 5.7°C | 92% | 114 | 5.1 | 0.35 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Expect frosty nights and below-freezing temperatures during this Cold Winter period.
🌤️ Conditions are ideal for outdoor activities throughout the day in this Mild Summer.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °C
Temperatures rise steadily from spring, peak in July, and gradually decline through autumn into winter.
These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 92% in December · annual avg 88%
The warmest year in Coleraine's recorded history was 2025 (avg: 10.9°C), while the coldest was 1986 (avg: 8.2°C).
Average annual high/low · Last 10 years · °C
Total annual precipitation · Last 10 years · mm/year
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 🔥 | 4.2°C | 10.9°C | 17.6°C | 1068 | 88% | 4.4 m/s |
2024 | 4.1°C | 10.2°C | 16.2°C | 1009 | 88% | 4.6 m/s |
2023 | 4.2°C | 10.5°C | 16.8°C | 1285 | 88% | 4.4 m/s |
2022 | 4.3°C | 10.4°C | 16.5°C | 1139 | 88% | 4.6 m/s |
2021 | 3.9°C | 10.2°C | 16.5°C | 1090 | 88% | 4.1 m/s |
2020 | 3.4°C | 9.6°C | 15.8°C | 1347 | 88% | 4.8 m/s |
2019 | 3.4°C | 9.7°C | 15.9°C | 1266 | 88% | 4.4 m/s |
2018 | 3.0°C | 9.6°C | 16.2°C | 1139 | 88% | 4.5 m/s |
2017 | 3.5°C | 9.6°C | 15.6°C | 1206 | 88% | 4.6 m/s |
2016 | 3.8°C | 9.9°C | 16.0°C | 1112 | 89% | 4.4 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), July is typically the hottest month in Coleraine, Northern Ireland, with average high temperatures around 21.5°C.
January is the coldest month in Coleraine, with average low temperatures around -0.9°C.
October receives the most rainfall with approximately 122 mm, while April is the driest with 75 mm.
The highest recorded temperature was 25.6°C in July 2022. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was -5.4°C in January 1982.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
Coleraine receives the most sunlight in June with an average solar radiation of 4.96 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Northern Ireland.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
