ERA5 almanac — 8 years of real data

Marrakech in May

Marrakech in May: rain frequency data not yet backfilled for this month, 87°F average high, 76% of days historically clear (n=248, ERA5 2018–2025).

Historically one of the better months to visit Marrakech for sun: 76% of days are clear on average (n=248, avg high 87°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 Marrakech 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 May

Clear-sky percentage for Marrakech in May, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early May 1st–15th	78%	n=120	87°F
Late May 16th–end	74%	n=128	87°F
Full month average	76%	n=248	87°F

Bottom line

Marrakech clears solidly in May: 76% of days historically (n=248), avg high 87°F. Most trips here in May will find more sun than cloud.

Every month in Marrakech

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

Historical clear-sky % for Marrakech, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	28%	n=248	All destinations →
February	48%	n=226	All destinations →
March	42%	n=248	All destinations →
April	60%	n=240	All destinations →
May ← this page	76%	n=248	All destinations →
June	90%	n=240	All destinations →
July	97%	n=248	All destinations →
August	98%	n=248	All destinations →
September	83%	n=240	All destinations →
October	79%	n=248	All destinations →
November	60%	n=240	All destinations →
December	37%	n=248	All destinations →

Frequently asked

Is Marrakech good for sun in May?

Yes. Marrakech is historically strong for sun in May: 76% of days are clear on average (avg high 87°F, n=248 days, ERA5 2018–2025).

→ Marrakech live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in May — all destinations ranked by May 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.