Weather in Barcelona in August

A good month. August is a solid month to be in Barcelona. Highs average 31.8 °C, lows 22 °C, and rain falls on 6 days — nothing in the month is working against you.

August ranks 12 of 12 — near the bottom of Barcelona's year. April is the month that works, and the swing between the two is 19 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: August is the weakest month of Barcelona's year and it is still a perfectly good one. The downside here is small.

Rain falls on only 6 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 31.8 °C days and 22 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 24 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 38.6 °C and the coldest night fell to 14 °C, and the wettest single day dropped 36 mm — roughly 88% of the month's rain in one day.

August is moderately variable: 2 mm in the driest year against 95 mm in the wettest, around an average of 41 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 8.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How August sits in the year

Temperatures hold steady either side: 32 °C in July, 31.8 here, 27.9 in September. Nothing about the timing within the month matters much.

Daylight in August

13.9 hours of daylight, losing 1.2 hours across the month. That is between Barcelona's extremes of 15.1 and 9.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 25.5 °C in August — warm enough to stay in as long as you like. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Barcelona versus nearby

If Barcelona is one option among several, the nearby comparison is worth making. Palma is a better bet in August — 3.5 °C cooler, 2 days less rain. Toulouse is close enough to be a coin toss — within a degree on temperature, 4 days more rain.

So: August is a compromise. April is 19 points better and is what Barcelona is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Barcelona

See all twelve months in Barcelona, or where else to go in August.