May weather forecastBarcelona, Spain
May
Weather in May
May ushers in warmer temperatures, averaging between 20.5°C (68.9°F) and 14.6°C (58.3°F). There's a respite from April's rains with a decrease in rainfall to 27mm (1.06") across 9.7 days. As the flowers continue to bloom in Barcelona, the city witnesses the advent of the summer season. Longer daylight hours and more sun to soak up mark the introduction to summer, with pleasantly warm temperatures gracing the city. As summer unveils, the city becomes busy with numerous outdoor activities and festivities, making May one of the most exciting times to visit.Temperature
The onset of May in Barcelona introduces a subtle rise in the average high-temperature, nudging from a refreshing 17.3°C (63.1°F) in April to a pleasant 20.5°C (68.9°F). The average low-temperature in Barcelona during May nights is a refreshing 14.6°C (58.3°F).Humidity
In May, the average relative humidity is 70%.Rainfall
In Barcelona, Spain, in May, it is raining for 9.7 days, with typically 27mm (1.06") of accumulated precipitation. In Barcelona, during the entire year, the rain falls for 117.9 days and collects up to 435mm (17.13") of precipitation.Snowfall
March through August, October through December are months without snowfall in Barcelona.Sea temperature
In Barcelona, the average seawater temperature in May is 18.1°C (64.6°F).Note: For most, swimming in 18.1°C (64.6°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Barcelona, the average length of the day in May is 14h and 31min.On the first day of the month, sunrise is at 06:47 and sunset at 20:49. On the last day of May, sunrise is at 06:20 and sunset at 21:17 CEST.
Sunshine
In Barcelona, the average sunshine in May is 11.1h.UV index
In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In May, a regular UV index of 5 translates into these guidelines:
Ensure safety - Recommendations to avert sunburn are presented. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Barcelona, Spain
- Average high temperature in May: 20.5°C
The warmest month (with the highest average high temperature) is August (27.5°C).
The month with the lowest average high temperature is January (12.4°C).
- Average low temperature in May: 14.6°C
The month with the highest average low temperature is August (22.1°C).
The coldest month (with the lowest average low temperature) is February (7.1°C).
Average pressure in May
Barcelona, Spain
- Average pressure in May: 1015.7mbar
The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1014.7mbar).
Average wind speed in May
Barcelona, Spain
- Average wind speed in May: 10.4km/h
The windiest month (with the highest average wind speed) is March (12.1km/h).
The calmest month (with the lowest average wind speed) is August (9.3km/h).
Average humidity in May
Barcelona, Spain
- Average humidity in May: 70%
The months with the highest relative humidity are April and October (72%).
The months with the lowest relative humidity are February, June and November (68%).
Average rainfall in May
Barcelona, Spain
- Average rainfall in May: 27mm
The wettest month (with the highest rainfall) is October (73mm).
The driest month (with the least rainfall) is February (16mm).
Average rainfall days in May
Barcelona, Spain
- Average rainfall days in May: 9.7 days
The month with the highest number of rainy days is September (13.8 days).
The month with the least rainy days is December (6.4 days).
Average snowfall in May
Barcelona, Spain
- Average snowfall in May: 0mm
The months with the highest snowfall are January, February and September (1mm).
The months with the least snowfall are March, April, May, June, July, August, October, November and December (0mm).
Average snowfall days in May
Barcelona, Spain
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, October, November and December (0 days).
Average sea temperature in May
Barcelona, Spain
- Average sea temperature in May: 18.1°C
The best month for swimming (with the highest average sea temperature) is August (25.3°C).
The coldest month (with the lowest average sea temperature) is February (13.1°C).
Average daylight in May /
Average sunshine in May
Barcelona, Spain
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 11h and 6min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in May
Barcelona, Spain
- Average sunshine days in May: 18.8 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is September (12.3 days).
Average UV index in May
Barcelona, Spain
- Average UV index in May: 5
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in May
Barcelona, Spain
- Average cloud cover in May: 23
The month with the most cloud cover is April (Cloud cover 31).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in May
Barcelona, Spain
- Average visibility in May: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
