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SunnyDays

ERA5 almanac — 8 years of real data

Mykonos in October

Mykonos in October: 11% of days see measurable rain, 72°F average high, 39% of days historically clear (n=248, ERA5 2018–2025).

Mykonos in October is historically a poor month for sun: only 39% of days clear across 8 years (n=248, avg high 72°F). 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 Mykonos 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 October

Clear-sky percentage for Mykonos in October, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early October
1st–15th		 49% n=120 72°F
Late October
16th–end		 30% n=128 72°F
Full month average 39% n=248 72°F

Sunshine & warmth in October

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 Mykonos in October. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early October
1st–15th		 67% n=120
Late October
16th–end		 36% n=128
Full month average 51% n=248
10.3 h median sunshine per day 92% of days exceed 8 h sunshine 11% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 39%. Sunshine-based “warm & sunny”: 51%. The 12-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

Mykonos is mostly overcast in October historically: only 39% of days are clear across 8 years (n=248), avg high 72°F. Most visitors this month will see more clouds than sun.

Every month in Mykonos

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

Historical clear-sky % for Mykonos, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 0% n=226 All destinations →
March 1% n=248 All destinations →
April 6% n=240 All destinations →
May 44% n=248 All destinations →
June 88% n=240 All destinations →
July 95% n=248 All destinations →
August 96% n=248 All destinations →
September 85% n=240 All destinations →
October ← this page 39% n=248 All destinations →
November 8% n=240 All destinations →
December 0% n=248 All destinations →

Frequently asked

Does it rain in Mykonos in October?

Rarely. Only 11% of days in Mykonos see measurable rain in October, based on 8 years of ERA5 historical data (n=248 days, 2018–2025). This is a historical average, not a forecast.

Is Mykonos good for sun in October?

It's mixed. Mykonos in October is clear on 39% of days historically (avg high 72°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Mykonos compares in October

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Mykonos 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.