ERA5 almanac — 8 years of real data

Miami in March

Miami in March: 36% of days see measurable rain, 80°F average high, 32% of days historically clear (n=248, ERA5 2018–2025).

Miami in March is historically a poor month for sun: only 32% of days clear across 8 years (n=248, avg high 80°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 Miami 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 Miami 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	33%	n=120	80°F
Late March 16th–end	32%	n=128	80°F
Full month average	32%	n=248	80°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 Miami 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	92%	n=120
Late March 16th–end	97%	n=128
Full month average	95%	n=248

11.2 h median sunshine per day 93% 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: 32%. Sunshine-based “warm & sunny”: 95%. The 63-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

Miami is mostly overcast in March historically: only 32% of days are clear across 8 years (n=248), avg high 80°F. Most visitors this month will see more clouds than sun.

Every month in Miami

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

Historical clear-sky % for Miami, all months, ERA5 2018–2025.
Month	% Clear	Sample (n)
January	28%	n=248	All destinations →
February	26%	n=226	All destinations →
March ← this page	32%	n=248	All destinations →
April	27%	n=240	All destinations →
May	20%	n=248	All destinations →
June	2%	n=240	All destinations →
July	6%	n=248	All destinations →
August	2%	n=248	All destinations →
September	4%	n=240	All destinations →
October	11%	n=248	All destinations →
November	25%	n=240	All destinations →
December	28%	n=248	All destinations →

Frequently asked

Does it rain in Miami in March?

Sometimes. Miami 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 Miami good for sun in March?

It's mixed. Miami in March is clear on 32% of days historically (avg high 80°F, n=248 days, ERA5 2018–2025) — the outcome varies year to year.

How Miami compares in March

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

→ Miami vs Aruba in March — Aruba is 33% clear historically
→ Miami vs San Antonio in March — San Antonio is 33% clear historically
→ Miami vs Cancún in March — Cancún is 34% clear historically

→ Miami 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.