Skip to main content
SunnyDays

ERA5 almanac — 8 years of real data

Barcelona in August

Barcelona in August: rain frequency data not yet backfilled for this month, 84°F average high, 53% of days historically clear (n=248, ERA5 2018–2025).

Barcelona in August is a mixed month for sun: 53% of days historically clear (n=248, avg high 84°F). The outcome varies year to year — check the early/late split below. Historical average, not a forecast.

What you are reading: 8-year historical averages from the ERA5 reanalysis, not a forecast. A month that is historically 90% clear can still be overcast on your specific trip. For this week’s actual forecast, see the live Barcelona page. Both can be true at once: “historically strong in this month; this particular week is not.” We label which is which.

Early vs. Late August

Clear-sky percentage for Barcelona in August, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early August
1st–15th		 64% n=120 84°F
Late August
16th–end		 43% n=128 84°F
Full month average 53% n=248 84°F

Bottom line

Barcelona in August is genuinely mixed: 53% of days historically clear (n=248), avg high 84°F — roughly even odds. The two halves differ materially (64% early, 43% late) — favour the early half of the month. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in Barcelona

Compare across all months with data. Numbers are historical clear-sky %.

Historical clear-sky % for Barcelona, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 3% n=248 All destinations →
April 4% n=240 All destinations →
May 25% n=248 All destinations →
June 61% n=240 All destinations →
July 64% n=248 All destinations →
August ← this page 53% n=248 All destinations →
September 38% n=240 All destinations →
October 27% n=248 All destinations →
November 4% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Is Barcelona good for sun in August?

It's mixed. Barcelona in August is clear on 53% of days historically (avg high 84°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.