Skip to main content
SunnyDays

ERA5 almanac — 8 years of real data

Naples in October

Naples in October is historically a poor month for sun: only 23% of days clear across 8 years (n=248, avg high 86°F). March is the clearest month for Naples historically. 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 Naples 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 Naples 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		 12% n=120 86°F
Late October
16th–end		 34% n=128 86°F
Full month average 23% n=248 86°F

Bottom line

Naples is mostly overcast in October historically: only 23% of days are clear across 8 years (n=248), avg high 86°F. The two halves differ materially (12% early, 34% late) — favour the late half of the month. If you want sun in Naples, March is historically much better. Most visitors this month will see more clouds than sun.

→ See all destinations in March — historically the best month for sun in Naples.

Every month in Naples

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

Historical clear-sky % for Naples, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 35% n=248 All destinations →
February 41% n=226 All destinations →
March 48% n=248 All destinations →
April 41% n=240 All destinations →
May 28% n=248 All destinations →
June 7% n=240 All destinations →
July 4% n=248 All destinations →
August 2% n=248 All destinations →
September 9% n=240 All destinations →
October ← this page 23% n=248 All destinations →
November 44% n=240 All destinations →
December 45% n=248 All destinations →

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.