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Belfast in May: Weather, Average temperature and Climate

Planning a trip and want to know what the weather in Belfast in May will be like? Take a look at our weather guide for Belfast, based on historical data.
Check flight prices to Belfast on Avionero:
May

Weather in Belfast in May 2024

OK Weather
Mild
☁️
Cloudy
Belfast in May usually sees fair weather conditions, with an average daily high temperature of +57°F and roughly 5 sunny days. However, you should prepare for about 9 rainy days with an average precipitation of 69 mm. The weather is changeable so pack for every eventuality. Search flights in one click on Avionero.
Good to know:
  • May is usually the driest month of the year in Belfast

Average weather

☀️
+57°F
Avg. max. temperature
+30°F
Min.
+77°F
Max.
69 mm
Total precipitation
75%
Avg. humidity
3 m/s
Avg. wind
5 ☀️
Sunny Days
17 ⛅️
Cloudy
9 🌦
Rainy
Our opinion: Belfast has OK weather in May.

Average temperature in Belfast in May

Here are the expected maximum, average and minimum temperatures in Belfast for May based on the historical data.
Last Year
Historical Data

The expected average maximum temperature in May is +61°F with a maximum of +66°F and a minimum of +45°F.

The average maximum temperature goes down 17% by the end of the month, compared with the beginning of the month, from +57°F to +54°F.

Is Belfast warm or cold in May?

Belfast is typically mild in May.

Maximum temperatures go up compared to the previous month from +52°F to +57°F. The minimum temperature also goes up from +41°F to +46°F.

Pack a light jacket as it will be warm in the day and cool in the evenings.

Take a look at how May is compared to other months in Belfast:

Climate in Belfast in May

Belfast weather looks like this, on average, in May and the surrounding months.
AprilMayJune
Avg. temperature
+52°F+57°F+63°F
Min. temperature
+27°F+30°F+36°F
Max. temperature
+72°F+77°F+86°F
Rainfall
60 mm69 mm73 mm
Wind
4 m/s3 m/s3 m/s
Humidity
77%75%76%
Air pressure
1013 HPa1013 HPa1014 HPa
Sunny days
453
Cloudy days
181718
Rainy days
899
Snowy days
000

May weather is still as ok as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +52°F to +57°F during the day. Prepare for more rain. Average rainfall goes from 60 mm to 69 mm. It feels drier, as humidity decreases from 77% to 75%. Winds are calmer in comparison to April, going down from 4 m/s to 3 m/s on average. The good news is there are likely to be more sunny days in May, from 4 to 5.

June brings much the same weather, it remains ok.

Wind

Wind speed in Belfast in May based on historical data.
Last Year
Historical Data

The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.

The average wind speed in Belfast is gradually increasing during May, going from 3 m/s to 3 m/s over the course of the month.

Rain

Amount of rainfall in mm during May in Belfast based on historical data.
Last Year
Historical Data
Typically, there is a 65% chance of rain on an average day in May, with total rainfall of approximately 79 mm. The maximum amount of rainfall per day is around 17 mm, which is considered light rain. May is a pretty wet month with over 20 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how May is compared with other months in the amount of precipitation, total mm:
Belfast wettest month is October, where a typical day has a 32% chance of precipitation and 91 mm of rainfall per day. April, on the other hand, is the driest month with a mere 27% chance of precipitation and 60 mm of rainfall per day.

How was the weather last May in Belfast?

This is the weather in Belfast in May 2023:
1 May
☁️
+57°F
2 May
☁️
+57°F
3 May
🌧️
+57°F
4 May
☁️
+59°F
5 May
☁️
+62°F
6 May
🌧️
+61°F
7 May
☁️
+61°F
8 May
☁️
+64°F
9 May
🌧️
+59°F
10 May
☁️
+61°F
11 May
☀️
+59°F
12 May
☀️
+57°F
13 May
☁️
+62°F
14 May
☁️
+66°F
15 May
🌧️
+62°F
16 May
🌧️
+64°F
17 May
🌧️
+59°F
18 May
☀️
+61°F
19 May
☁️
+62°F
20 May
☀️
+61°F
21 May
🌧️
+61°F
22 May
☁️
+64°F
23 May
🌧️
+59°F
24 May
☀️
+61°F
25 May
☀️
+61°F
26 May
☀️
+61°F
27 May
☁️
+59°F
28 May
☁️
+59°F
29 May
☁️
+59°F
30 May
🌧️
+53°F
31 May
🌧️
+53°F
In May 2023 Belfast had 7 sunny days, 14 cloudy days, and 10 rainy days. The average maximum temperature was +61°F, with an absolute maximum of +66°F and a minimum of +54°F. The average humidity was 76%, with a maximum of 99% and a minimum of 44%. The average wind speed was 5 m/s, with a maximum of 12 m/s and a minimum of 0 m/s.
Are you planning a trip in May?

Climate Change Over the Years

This is how Belfast climate has changed over the last 43 years.

The climate in Belfast in May has not changed that much over the last 43 years.

The average temperature was the lowest in 1979 (+55°F) and the highest in 2017 (+65°F). The driest year was 1991 with only 9 mm of rainfall, and the wettest year was 1993 with 158 mm.

FAQ

Frequently asked questions about the weather in Belfast in May:

Is May a good time to visit Belfast?

It’s always a good time to visit Belfast, but the weather is changeable in May, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Belfast in May?

May has mild temperatures in Belfast. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Is Belfast rainy in May?

Belfast is often rainy in May. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Belfast in May?

Usually, it’s not very sunny in Belfast in May, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in United Kingdom

Check out the weather for other cities in United Kingdom.

Monthly weather in Belfast

Source of the data

For this page, we’ve looked at the typical weather in Belfast, based on historical hourly weather data from January 1, 1979, to December 31, 2022.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.