ERA5 almanac — 8 years of real data

Aruba in March

Aruba in March: 36% of days see measurable rain, 85°F average high, 33% of days historically clear (n=248, ERA5 2018–2025).

Aruba in March is historically a poor month for sun: only 33% of days clear across 8 years (n=248, avg high 85°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 Aruba 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 March

Clear-sky percentage for Aruba in March, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period	% Clear days	Sample (n)	Avg high
Early March 1st–15th	38%	n=120	85°F
Late March 16th–end	28%	n=128	85°F
Full month average	33%	n=248	85°F

Sunshine & warmth in March

A second measure using actual sunshine hours (ERA5 sunshine_duration), not the daily weather code. A Lowcountry day with 12 hours of sun and a 25-minute afternoon storm is counted below as a warm, sunny day — because it was. How we define this.

Sunshine-based metrics for Aruba in March. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period	Warm & sunny (≥72°F, >6 h sun)	Sample (n)
Early March 1st–15th	100%	n=120
Late March 16th–end	100%	n=128
Full month average	100%	n=248

11.8 h median sunshine per day 100% of days exceed 8 h sunshine 36% of days see ≥ 1 mm rain — rain is not hidden

Comparison (old vs new): WMO-code “clear” bar: 33%. Sunshine-based “warm & sunny”: 100%. The 67-point gap is from brief afternoon convective storms that stamp the whole day as “rain” in the WMO code but leave the bulk of the sunshine untouched.

Bottom line

Aruba is mostly overcast in March historically: only 33% of days are clear across 8 years (n=248), avg high 85°F. Most visitors this month will see more clouds than sun.

Every month in Aruba

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

Historical clear-sky % for Aruba, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	24%	n=248	All destinations →
February	22%	n=226	All destinations →
March ← this page	33%	n=248	All destinations →
April	33%	n=240	All destinations →
May	39%	n=248	All destinations →
June	30%	n=240	All destinations →
July	22%	n=248	All destinations →
August	24%	n=248	All destinations →
September	32%	n=240	All destinations →
October	14%	n=248	All destinations →
November	6%	n=240	All destinations →
December	12%	n=248	All destinations →

Frequently asked

Does it rain in Aruba in March?

Sometimes. Aruba sees measurable rain on 36% of days in March historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Aruba good for sun in March?

It's mixed. Aruba in March is clear on 33% of days historically (avg high 85°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Aruba compares in March

Head-to-head clear-sky comparisons against destinations travelers plausibly weigh against Aruba this month — same passport tier, similar flight distance, both sides from the same 8-year ERA5 record.

→ Aruba vs San Antonio in March — San Antonio is 33% clear historically
→ Aruba vs Cancún in March — Cancún is 34% clear historically
→ Aruba vs Costa Rica — Manuel Antonio in March — Costa Rica — Manuel Antonio is 34% clear historically

→ Aruba live forecast — this week’s actual 7-day weather, not historical
→ Best destinations in March — all destinations ranked by March 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.