ERA5 almanac — 8 years of real data

Huatulco in April

Huatulco in April: rain frequency data not yet backfilled for this month, 90°F average high, 67% of days historically clear (n=240, ERA5 2018–2025).

Huatulco in April is a mixed month for sun: 67% of days historically clear (n=240, avg high 90°F). The outcome varies year to year — check the early/late split below. 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 Huatulco 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 Huatulco 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	80%	n=120	90°F
Late April 16th–end	54%	n=120	90°F
Full month average	67%	n=240	90°F

Bottom line

Huatulco clears solidly in April: 67% of days historically (n=240), avg high 90°F. The two halves differ materially (80% early, 54% late) — favour the early half of the month. Most trips here in April will find more sun than cloud.

Every month in Huatulco

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

Historical clear-sky % for Huatulco, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	69%	n=248	All destinations →
February	68%	n=226	All destinations →
March	75%	n=248	All destinations →
April ← this page	67%	n=240	All destinations →
May	40%	n=248	All destinations →
June	7%	n=240	All destinations →
July	12%	n=248	All destinations →
August	5%	n=248	All destinations →
September	4%	n=240	All destinations →
October	9%	n=248	All destinations →
November	36%	n=240	All destinations →
December	68%	n=248	All destinations →

Frequently asked

Is Huatulco good for sun in April?

Yes. Huatulco is historically strong for sun in April: 67% of days are clear on average (avg high 90°F, n=240 days, ERA5 2018–2025).

→ Huatulco live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in April — all destinations ranked by April clear-sky %
→ All destinations
→ Raw data (JSON) — buckets, n, source

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.