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SunnyDays

ERA5 almanac — 8 years of real data

Nashville in October

Nashville in October is historically a poor month for sun: only 32% of days clear across 8 years (n=248, avg high 73°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 Nashville 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 Nashville 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		 43% n=120 73°F
Late October
16th–end		 21% n=128 73°F
Full month average 32% n=248 73°F

Bottom line

Nashville is mostly overcast in October historically: only 32% of days are clear across 8 years (n=248), avg high 73°F. The two halves differ materially (43% early, 21% late) — favour the early half of the month. Most visitors this month will see more clouds than sun.

Every month in Nashville

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

Historical clear-sky % for Nashville, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 0% n=248 All destinations →
February 1% n=226 All destinations →
March 8% n=248 All destinations →
April 18% n=240 All destinations →
May 28% n=248 All destinations →
June 30% n=240 All destinations →
July 19% n=248 All destinations →
August 32% n=248 All destinations →
September 48% n=240 All destinations →
October ← this page 32% n=248 All destinations →
November 6% n=240 All destinations →
December 0% 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.