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SunnyDays

ERA5 almanac — 8 years of real data

Exuma in September

Exuma in September: rain frequency data not yet backfilled for this month, 85°F average high, 20% of days historically clear (n=240, ERA5 2018–2025).

Exuma in September is historically a poor month for sun: only 20% of days clear across 8 years (n=240, avg high 85°F). April is the clearest month for Exuma 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 Exuma 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 September

Clear-sky percentage for Exuma in September, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early September
1st–15th		 24% n=120 85°F
Late September
16th–end		 17% n=120 85°F
Full month average 20% n=240 85°F

Bottom line

Exuma is mostly overcast in September historically: only 20% of days are clear across 8 years (n=240), avg high 85°F. If you want sun in Exuma, April is historically much better. Most visitors this month will see more clouds than sun.

→ See all destinations in April — historically the best month for sun in Exuma.

Every month in Exuma

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

Historical clear-sky % for Exuma, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 38% n=248 All destinations →
February 39% n=226 All destinations →
March 45% n=248 All destinations →
April 46% n=240 All destinations →
May 27% n=248 All destinations →
June 20% n=240 All destinations →
July 25% n=248 All destinations →
August 18% n=248 All destinations →
September ← this page 20% n=240 All destinations →
October 12% n=248 All destinations →
November 25% n=240 All destinations →
December 37% n=248 All destinations →

Frequently asked

Is Exuma good for sun in September?

Not usually. Exuma is historically overcast in September: only 20% of days are clear (avg high 85°F, n=240 days, ERA5 2018–2025). April is historically far better for sun here.

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.