Belfast Climate by Month
Belfast, Northern Ireland, United Kingdom
Mild summers and cool winters, with rain spread through the year.
Belfast has mild summers and cool winters, with rain spread through the year. Afternoon highs range from 45°F (7°C) in January to 69°F (21°C) in July, and January nights average 35°F (2°C). It gets 34 in (851 mm) of rain a year, spread across the months. The air is humid, averaging 83% relative humidity.
- Warmest month
- 69°F(21°C)
- Average high, July
- Coldest nights
- 35°F(2°C)
- Average low, January
- Rain per year
- 34 in(851 mm)
- No clear rainy season
- Humidity
- 83%
- Sunniest: June
Best and worst months in Belfast
Best for weatherThe most comfortable weather comes from June to August, with highs around 68°F (20°C) and about 2.9 in (75 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 45°F (7°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Belfast weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 45°F(7°C) | 35°F(2°C) | 2.9 in(73 mm) | 95% | 0.5 |
| FebFebruary | 47°F(8°C) | 35°F(2°C) | 2.3 in(59 mm) | 91% | 1.2 |
| MarMarch | 51°F(11°C) | 38°F(3°C) | 2.3 in(58 mm) | 80% | 2.1 |
| AprApril | 56°F(13°C) | 41°F(5°C) | 2.2 in(57 mm) | 78% | 3.6 |
| MayMay | 62°F(17°C) | 45°F(7°C) | 2.3 in(58 mm) | 71% | 4.5 |
| JunJuneBest | 67°F(19°C) | 51°F(10°C) | 2.7 in(68 mm) | 71% | 4.7 |
| JulJulyBest | 69°F(21°C) | 54°F(12°C) | 2.9 in(73 mm) | 75% | 4.3 |
| AugAugustBest | 68°F(20°C) | 53°F(12°C) | 3.3 in(83 mm) | 77% | 3.6 |
| SepSeptember | 64°F(18°C) | 49°F(10°C) | 2.9 in(73 mm) | 83% | 2.7 |
| OctOctober | 56°F(14°C) | 45°F(7°C) | 3.4 in(86 mm) | 88% | 1.4 |
| NovNovember | 50°F(10°C) | 39°F(4°C) | 3.3 in(85 mm) | 90% | 0.7 |
| DecDecember | 45°F(7°C) | 36°F(2°C) | 3.1 in(78 mm) | 94% | 0.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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