ERA5 almanac — 8 years of real data

Seville in September

Seville in September: rain frequency data not yet backfilled for this month, 89°F average high, 76% of days historically clear (n=240, ERA5 2018–2025).

Historically one of the better months to visit Seville for sun: 76% of days are clear on average (n=240, avg high 89°F). Every percentage here is a historical average from 8 years of ERA5 data — 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 Seville 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 September

Clear-sky percentage for Seville in September, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early September 1st–15th	79%	n=120	89°F
Late September 16th–end	74%	n=120	89°F
Full month average	76%	n=240	89°F

Bottom line

Seville clears solidly in September: 76% of days historically (n=240), avg high 89°F. Most trips here in September will find more sun than cloud.

Every month in Seville

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

Historical clear-sky % for Seville, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	1%	n=248	All destinations →
February	11%	n=226	All destinations →
March	26%	n=248	All destinations →
April	40%	n=240	All destinations →
May	74%	n=248	All destinations →
June	82%	n=240	All destinations →
July	99%	n=248	All destinations →
August	96%	n=248	All destinations →
September ← this page	76%	n=240	All destinations →
October	63%	n=248	All destinations →
November	16%	n=240	All destinations →
December	0%	n=248	All destinations →

Frequently asked

Is Seville good for sun in September?

Yes. Seville is historically strong for sun in September: 76% of days are clear on average (avg high 89°F, n=240 days, ERA5 2018–2025).

→ Seville live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in September — all destinations ranked by September clear-sky %
→ All destinations
→ Raw data (JSON) — buckets, n, source

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.