May offers one of the best compromises of the year in Barcelona: 22.2°C during the day, 271 hours of sunshine, as much as in June, and only 30 mm of rain. Only the sea remains cool, around 17.8°C.
Temperatures, rain and sunshine: AEMET station 0076 (Barcelona Aeropuerto), 2016-2025 averages against the 1991-2020 normal. Sea: NOAA OISST, same period. Daylight runs from 14 hr 03 min to 15 hr 00 min across the month.
Early, Mid or Late May?
The weather changes throughout the month. If you're deciding between several dates, here's what sets each period apart. Averages per decade over ten years, AEMET station 0076.
May 1st → 10th
21°C / 13.5°C, 13 mm of rain.
This is the coolest and wettest period of the month, with 21°C during the day and thirteen millimeters of rain. Afternoons are already pleasant, but a jacket is still useful in the evening.
May 11 → 20
22.1°C / 14.4°C, 10 mm of rain.
Temperatures rise by one degree while the rain decreases. With over fourteen and a half hours of daylight, terraces come alive until late.
May 21 to 31
23.4°C / 16.5°C, 7 mm of rain.
This is the mildest and driest period, with 23.4°C during the day and only seven millimeters of rain. As the month progresses, the atmosphere becomes more like summer.
What to Pack in Your Suitcase
Essentials
- Light clothing, with an extra layer for the evening when temperatures drop to 14.9°C
- Sunglasses and sunscreen: May boasts 271 hours of sunshine
- Comfortable shoes to enjoy long days of walking tours
- A swimsuit for the pool or to enjoy the sunny beach, even if the sea remains cool
Still Worth Bringing
- A compact umbrella for the five rainy days, especially at the beginning of the month
- Something to cover your shoulders for the Sagrada Família and the cathedral
- A wetsuit if you really want to swim for a long time: the sea is still at 17.8°C
- A light jacket for the waterfront, where the breeze can stay cool
The long days
Enjoy the very long days
May offers 271 hours of sunshine, just like June, but with milder temperatures. It's one of the best times of the year for long walks and visits that require time.
A Full Day
Montjuïc
Family Fun
Poble Espanyol
With the view
Fundació Joan Miró
On the Agenda
What to Do in Barcelona in May?
May truly kicks off the outdoor activity season in Barcelona. Festivals abound, and the evenings become mild enough to enjoy the terraces and stay outside until late.
May or June?
June gains +4.6°C on the highs and raises the sea from 17.8°C to 22.1°C, making swimming much more enjoyable. It also brings the first four days at 30°C of the year: May remains milder for visiting, while June is more appealing for the beach.
| April | May | June | |
|---|---|---|---|
| Maximum | 18.7°C | 22.2°C | 26.8°C |
| Minimum | 11.4°C | 14.9°C | 19.8°C |
| Sea | 15°C | 17.8°C | 22.1°C |
| Rain | 63 mm | 30 mm | 25 mm |
| Sunshine | 226 h | 271 h | 271 h |
| Rainy days | 6 | 5 | 3 |
May in the Year
With an average high of 22.2°C, May marks the arrival of the first truly warm days. It also reaches 271 hours of sunshine, a level comparable to early summer.
Frequently Asked Questions About May in Barcelona
For many visitors, it's one of the most pleasant months: 22.2°C average high, 14.9°C at night, 271 hours of sunshine, and only 30 mm of rain.
The sea remains cool at 17.8°C. Some swimmers are already taking advantage of it, but most visitors prefer to wait until June, when it reaches 22.1°C.
The days are pleasantly warm without reaching summer levels. The mildest days rise to 26.4°C, but none exceed 30°C on average, making sightseeing very comfortable.
Little: the month receives about 30 mm of rain over five days, with precipitation generally decreasing as May progresses.
May is often preferable for visiting the city, while September is ideal for enjoying the sea. Air temperatures are similar, but September receives more than twice the rainfall and offers a sea temperature of 25.1°C compared to 17.8°C in May.