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SunnyDays

ERA5 almanac — 8 years of real data

St. Barthélemy in April

St. Barthélemy in April: rain frequency data not yet backfilled for this month, 79°F average high, 22% of days historically clear (n=240, ERA5 2018–2025).

St. Barthélemy in April is historically a poor month for sun: only 22% of days clear across 8 years (n=240, avg high 79°F). March is the clearest month for St. Barthélemy 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 St. Barthélemy 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 April

Clear-sky percentage for St. Barthélemy in April, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early April
1st–15th		 27% n=120 79°F
Late April
16th–end		 17% n=120 79°F
Full month average 22% n=240 79°F

Bottom line

St. Barthélemy is mostly overcast in April historically: only 22% of days are clear across 8 years (n=240), avg high 79°F. If you want sun in St. Barthélemy, 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 St. Barthélemy.

Every month in St. Barthélemy

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

Historical clear-sky % for St. Barthélemy, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 18% n=248 All destinations →
February 12% n=226 All destinations →
March 29% n=248 All destinations →
April ← this page 22% n=240 All destinations →
May 21% n=248 All destinations →
June 19% n=240 All destinations →
July 10% n=248 All destinations →
August 14% n=248 All destinations →
September 13% n=240 All destinations →
October 20% n=248 All destinations →
November 19% n=240 All destinations →
December 18% n=248 All destinations →

Frequently asked

Is St. Barthélemy good for sun in April?

Not usually. St. Barthélemy is historically overcast in April: only 22% of days are clear (avg high 79°F, n=240 days, ERA5 2018–2025). March 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.