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SunnyDays

ERA5 almanac — 8 years of real data

Ibiza in May

Ibiza in May: rain frequency data not yet backfilled for this month, 73°F average high, 45% of days historically clear (n=248, ERA5 2018–2025).

Ibiza in May is a mixed month for sun: 45% of days historically clear (n=248, avg high 73°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 Ibiza 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 Ibiza 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		 32% n=120 73°F
Late May
16th–end		 58% n=128 73°F
Full month average 45% n=248 73°F

Bottom line

Ibiza in May is genuinely mixed: 45% of days historically clear (n=248), avg high 73°F — roughly even odds. The two halves differ materially (32% early, 58% late) — favour the late half of the month. The outcome varies year to year; don't book if you need guaranteed sun.

Every month in Ibiza

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

Historical clear-sky % for Ibiza, 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 8% n=240 All destinations →
May ← this page 45% n=248 All destinations →
June 82% n=240 All destinations →
July 88% n=248 All destinations →
August 79% n=248 All destinations →
September 54% n=240 All destinations →
October 47% n=248 All destinations →
November 11% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Is Ibiza good for sun in May?

It's mixed. Ibiza in May is clear on 45% of days historically (avg high 73°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.