Our verdict
The best time to visit Belfast is May-June
In the summer months, temperatures can reach as high as 19℃ (66℉) in Belfast. The weather at night in the winter can get down to temperatures as low as 0℃ (33℉).
If you’re keen to see the sights of Belfast during the day, the sun stays up the longest around June. November sees the most amount of rain in a month if you’re ok with chancing getting drenched, so if you’re looking to stay dry, visit in May instead.
For more information about when to travel to Belfast, the monthly weather breakdown and the best information and tools to book your trip, continue reading below.
Quick links: Fast facts / Seasons / Average temperatures / Monthly climate / FAQs / Map
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Belfast seasons
Before you continue, it’s important to know when the seasons are in Belfast as they might be different to yours depending on where in the world you’re travelling from. Belfast is in the Northern Hemisphere, so the seasons fall during these months:
| Season | Months |
|---|---|
| Summer | June to August |
| Autumn/fall | September to November |
| Winter | December to February |
| Spring | March to May |
Average temperatures in Belfast
If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Belfast for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.
Belfast climate by month
If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Belfast for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.
Jump to:
Belfast in January
- Average temperature: 5℃ (41℉)
- Average high temperature: 7℃ (44℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 88%
- Average sunny days: 9 days
- Average rainfall: 45mm (2") over 18 days
- Average snow days: 3 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in January, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Belfast in February
- Average temperature: 5℃ (41℉)
- Average high temperature: 7℃ (45℉)
- Average low temperature: 3℃ (37℉)
- Average humidity: 86%
- Average sunny days: 8 days
- Average rainfall: 53mm (2") over 16 days
- Average snow days: 3 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in February, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Belfast in March
- Average temperature: 6℃ (43℉)
- Average high temperature: 9℃ (47℉)
- Average low temperature: 3℃ (38℉)
- Average humidity: 84%
- Average sunny days: 9 days
- Average rainfall: 48mm (2") over 18 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in March, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Belfast in April
- Average temperature: 8℃ (46℉)
- Average high temperature: 11℃ (52℉)
- Average low temperature: 5℃ (41℉)
- Average humidity: 83%
- Average sunny days: 12 days
- Average rainfall: 39mm (2") over 16 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in April, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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Belfast in May
- Average temperature: 11℃ (51℉)
- Average high temperature: 13℃ (56℉)
- Average low temperature: 7℃ (45℉)
- Average humidity: 83%
- Average sunny days: 11 days
- Average rainfall: 38mm (1") over 18 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in May, make sure you pack a warm jacket or coat.
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Belfast in June
- Average temperature: 13℃ (55℉)
- Average high temperature: 16℃ (61℉)
- Average low temperature: 10℃ (49℉)
- Average humidity: 84%
- Average sunny days: 8 days
- Average rainfall: 56mm (2") over 19 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in June, make sure you pack a warm jacket or coat.
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Belfast in July
- Average temperature: 14℃ (58℉)
- Average high temperature: 17℃ (63℉)
- Average low temperature: 11℃ (52℉)
- Average humidity: 86%
- Average sunny days: 7 days
- Average rainfall: 52mm (2") over 21 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in July, make sure you pack a warm jacket or coat.
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Belfast in August
- Average temperature: 14℃ (57℉)
- Average high temperature: 17℃ (62℉)
- Average low temperature: 11℃ (52℉)
- Average humidity: 87%
- Average sunny days: 5 days
- Average rainfall: 62mm (2") over 23 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in August, make sure you pack a warm jacket or coat.
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Belfast in September
- Average temperature: 13℃ (55℉)
- Average high temperature: 15℃ (59℉)
- Average low temperature: 10℃ (50℉)
- Average humidity: 87%
- Average sunny days: 8 days
- Average rainfall: 40mm (2") over 16 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in September, make sure you pack a warm jacket or coat.
Belfast in October
- Average temperature: 10℃ (51℉)
- Average high temperature: 13℃ (55℉)
- Average low temperature: 8℃ (47℉)
- Average humidity: 87%
- Average sunny days: 9 days
- Average rainfall: 50mm (2") over 18 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in October, make sure you pack a warm jacket or coat.
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Belfast in November
- Average temperature: 7℃ (45℉)
- Average high temperature: 9℃ (49℉)
- Average low temperature: 6℃ (42℉)
- Average humidity: 87%
- Average sunny days: 7 days
- Average rainfall: 66mm (3") over 19 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in November, make sure you pack a warm jacket or coat.
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Belfast in December
- Average temperature: 6℃ (42℉)
- Average high temperature: 7℃ (45℉)
- Average low temperature: 4℃ (39℉)
- Average humidity: 88%
- Average sunny days: 9 days
- Average rainfall: 51mm (2") over 17 days
- Average snow days: 1 days
of pure sunshine
of showers or rain
What to pack: If you’re heading to Belfast in December, make sure you pack a thick snow/winter jacket, thermals and some extra layers as it's always very cold.
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