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SunnyDays

ERA5 almanac — 8 years of real data

Mallorca in May

Mallorca in May: 26% of days see measurable rain, 75°F average high, 40% of days historically clear (n=248, ERA5 2018–2025).

Mallorca in May is a mixed month for sun: 40% of days historically clear (n=248, avg high 75°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 Mallorca 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 Mallorca 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		 28% n=120 75°F
Late May
16th–end		 52% n=128 75°F
Full month average 40% n=248 75°F

Sunshine & warmth in May

A second measure using actual sunshine hours (ERA5 sunshine_duration), not the daily weather code. A Lowcountry day with 12 hours of sun and a 25-minute afternoon storm is counted below as a warm, sunny day — because it was. How we define this.

Sunshine-based metrics for Mallorca in May. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early May
1st–15th		 51% n=120
Late May
16th–end		 78% n=128
Full month average 65% n=248
13.1 h median sunshine per day 94% of days exceed 8 h sunshine 26% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 40%. Sunshine-based “warm & sunny”: 65%. The 25-point gap is from brief afternoon convective storms that stamp the whole day as “rain” in the WMO code but leave the bulk of the sunshine untouched.

Bottom line

Mallorca in May is genuinely mixed: 40% of days historically clear (n=248), avg high 75°F — more cloudy than clear. The two halves differ materially (28% early, 52% 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 Mallorca

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

Historical clear-sky % for Mallorca, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 1% n=248 All destinations →
February 1% n=226 All destinations →
March 7% n=248 All destinations →
April 16% n=240 All destinations →
May ← this page 40% n=248 All destinations →
June 72% n=240 All destinations →
July 80% n=248 All destinations →
August 70% n=248 All destinations →
September 42% n=240 All destinations →
October 40% n=248 All destinations →
November 8% n=240 All destinations →
December 1% n=248 All destinations →

Frequently asked

Does it rain in Mallorca in May?

Sometimes. Mallorca sees measurable rain on 26% of days in May historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Mallorca good for sun in May?

It's mixed. Mallorca in May is clear on 40% of days historically (avg high 75°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Mallorca compares in May

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Mallorca this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

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.