Monthly climate guide
Belfast weather in May
With highs near 13°C (55°F) and lows around 8°C (46°F), May feels cool in Belfast. Rainfall averages about 65 mm (some rain) and the sky is often cloudy. Daytime highs are 3°C warmer than April and 2°C cooler than June.
What stands out in May
- Belfast is usually about 2°C cooler than Liverpool, 230 km away, in May.
- May brings late spring to Belfast.
- It's one of the sunniest months here, with cloud cover around 71%.
- Days and nights are close, only about 5°C apart.
Avg high
13°C
55°F
Avg low
8°C
46°F
Rainfall
65 mm
some rain
Humidity
84%
relative
Sky
71%
cloud · often cloudy
Belfast weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 7°C / 45°F | 4°C / 40°F | 98 mm | 91% | 83% |
| February | 7°C / 45°F | 4°C / 39°F | 92 mm | 90% | 82% |
| March | 8°C / 47°F | 4°C / 39°F | 75 mm | 88% | 79% |
| April | 10°C / 50°F | 6°C / 42°F | 54 mm | 86% | 73% |
| May | 13°C / 55°F | 8°C / 46°F | 65 mm | 84% | 71% |
| June | 15°C / 59°F | 11°C / 51°F | 87 mm | 85% | 74% |
| July | 17°C / 62°F | 12°C / 54°F | 92 mm | 86% | 74% |
| August | 17°C / 62°F | 12°C / 54°F | 102 mm | 87% | 77% |
| September | 15°C / 59°F | 11°C / 52°F | 86 mm | 87% | 76% |
| October | 13°C / 55°F | 9°C / 49°F | 116 mm | 88% | 80% |
| November | 10°C / 50°F | 7°C / 44°F | 112 mm | 90% | 80% |
| December | 8°C / 47°F | 5°C / 42°F | 116 mm | 92% | 83% |
What to pack for May
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is May a good time to visit Belfast?
Compare the months in the chart above to find your ideal window.
Best time to visit Belfast →Other United Kingdom cities in May
Cite or embed this data
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Belfast weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/uk/belfast/may
<a href="https://weathercompare.eu/weather/uk/belfast/may">Belfast weather in May</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/uk/belfast" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Belfast weather in May"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/uk/belfast/may">Belfast weather in May</a> – WeatherCompare</p>
Belfast in May: quick answers
Is May a good time to visit Belfast?
May is cool in Belfast, with highs around 13°C. Better for museums and city walks than the beach, and usually quieter.
How warm is Belfast in May?
Average highs are about 13°C (55°F) and average lows about 8°C (46°F), based on 10 years of daily data.
Does it rain a lot in Belfast in May?
Belfast typically gets around 65 mm of rain in May — some rain.
Figures are long-term averages for the area around Belfast (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.