Barcelona Marathon 2027 weather: what race day will likely feel like

The Zurich Marató de Barcelona is on Sunday 14 March 2027: 42.2 km on an all-city course, from Passeig de Gràcia through the Eixample, past the Sagrada Família, down the Paral·lel to the old port, along the seafront to the Fòrum and back through Poblenou to the Arc de Triomf. Here's what race day has usually felt like, section by section, for a runner in the middle of the field.

What will the weather be like at the 2027 Barcelona Marathon?

Usually cool, mostly dry and calm: good running weather for most of the field. In the records, a runner from the 08:30 start began at about 11° and finished at about 15°, with a dew point near 8°. RunFast's engine rated race day Good on 7 days in 10, Fair on 3 and Tough on fewer than 1.

The heat stress (WBGT, the number race medical teams use) was usually about 16°. It reached Moderate or more on about 2 days in 10, and High on less than 1. The warmest race day in the records reached 22°.

Where does the weather usually cost runners time?

Mostly the wind, and not by much. On the middle day of the records, the weather cost a 5:40-per-km runner about 2 minutes over the whole race, and 7 minutes or more on 1 day in 10. The wind was the main cause on about 7 of those days in 10.

Start · Passeig de GràciaSagrada FamíliaMonument a ColomFòrumFinish · Arc de Triomf1234567Historic

For most of the first half, the map is green: on a middle day those stretches cost almost nothing. From the Paral·lel down to the sea and on to the finish, as the morning warms up, it turns amber, every stretch a little slower, by about 1 to 2%. No single stretch stands out. The breeze is usually from the north through the morning, turning south-east off the sea by late morning, at 7 to 9 km/h. It's light and changeable, so no stretch has a reliable headwind. Carrer de València and the run north to La Sagrera were more often into it, and the run back west along carrer de Mallorca more often behind. Along the seafront it was about as often behind as against.

What is each section likely to feel like?

Each section with its usual race morning, hour by hour, timed for the 08:30 start and a steady 5:40 per km.

1. Gran Via and the Eixample to Calàbria

From the start on Passeig de Gràcia, along Gran Via de les Corts Catalanes towards La Monumental, then back west across the Eixample on carrer d'Aragó to carrer de Calàbria by km 5. It's about 10° for the first few kilometres, after a wait at about 8° in the start area, and the light northerly, about 8 km/h, was more often behind than against. The heat stress was Low here on every day in the records.

2. Carrer de València to La Sagrera

East along carrer de València, then carrer de Huelva and the Pont de Calatrava to La Sagrera at km 11. It's about 11°, and heading east and then north, the light northerly was more often in runners' faces, mostly a headwind on about 4 days in 10.

3. Back along carrer de Mallorca

Avinguda Meridiana, then the long run west on carrer de Mallorca, past the Sagrada Família again at km 14 and La Pedrera at km 15, to Calàbria at km 17. Heading west on carrer de Mallorca, the wind, about 7 km/h from the north, was more often behind, on about 4 days in 10, than against, on about 2. The heat stress is still Low, and Moderate on about 1 day in 10.

4. Gran Via, Sant Antoni and the Paral·lel

Gran Via, Ronda de la Universitat and carrer de Sepúlveda, past halfway on carrer de Floridablanca, then down Avinguda del Paral·lel to the sea at Drassanes. It's about 13° by halfway, and the heat stress is usually Low, Moderate on about 1 day in 10.

5. Colom, the Ciutadella and the Port Olímpic

Past the Monument a Colom, along Passeig de Colom and Passeig d'Isabel II, around the Parc de la Ciutadella to the Port Olímpic at km 27. The wind is changing here, about 8 km/h with no settled direction, as the morning northerly gives way to a breeze off the sea. It was mostly a headwind on about 3 days in 10, and this section was rated Good on 6 days in 10 and Fair on 3.

6. Avinguda del Litoral, the Fòrum and Diagonal

The seafront: Avinguda del Litoral to the Parc del Fòrum at km 30, then back west on Avinguda Diagonal to carrer de Llull. Along Avinguda del Litoral the breeze off the sea is usually light, about 9 km/h, and changeable: it was mostly a headwind on about 3 days in 10, and mostly behind on about 2. This section was rated Good on 6 days in 10 and Fair on 3.

7. Poblenou to the Arc de Triomf

Carrer de Llull, carrer de Pallars and carrer de la Marina through Poblenou, then carrer dels Almogàvers to the finish by the Arc de Triomf. It's about 15° at the finish, with a south-easterly breeze of about 9 km/h. This is the warmest part of the run, with heat stress Moderate on about 2 days in 10, and it was rated Good on 5 days in 10, the fewest of any section.

What should runners wear and pack for race day?

Layers for the start, race kit for about 10–15°, and something for the wind. The organiser's course page has the course map, the start and finish maps and the GPX, and its regulation has the start corrals and the time limit. From the weather records:

• Old layers for the start. It was about 8° before the 08:30 start, 5° or colder on 1 morning in 10.
• Race kit for 10–15°. That's shorts and a light top for most runners, with gloves and arm sleeves you can drop early.
• A cap or a light shell on wet days. Rain fell during the run on about 1 day in 10.
• Sunscreen on clear days. Heat stress reached Moderate on about 2 days in 10.

Spain's clocks don't go forward until 28 March 2027, so race day is on Central European Time (UTC+1).

When does the real forecast open?

Ten days before the race, in the RunFast app: on 4 March. Load the course with your own pace and start time, and RunFast shows the heat and the wind at each stretch as you get there. From then on, trust the forecast over this preview.

How did we work this out?

The course was run again on every day from a week before to a week after 14 March, in each year from 2015 to 2024: 150 days. Each run started at the race's 08:30, Central European Time, at a steady 5:40 per km, on that day's hourly Copernicus ERA5 weather, with its dew point and sunshine. The starts are staggered by pace, so most of the field crosses the line a little after 08:30. RunFast's engine, the same one the app uses, worked out the heat stress and the weather's toll, and rated the run and each section. The start-area wait is the lowest temperature between 7:00 and the start, and a wet day has 1 mm of rain or more.

ERA5's grid cells are about 25 km across, and the few that cover this course are partly over the sea. Streets, shelter and the city's own warmth don't show. The course line is the organiser's official route on Strava, simplified: the 2026 course, as the organiser hasn't published 2027 changes yet. Historic weather, not a forecast.

Sources: The Zurich Marató de Barcelona's home page, with the 2027 date; its course page, with the 2026 course map and the official Strava route; its regulation and frequently asked questions; ERA5 hourly time series (Hersbach et al., 2020). Contains modified Copernicus Climate Change Service information (2026). Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.