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SunnyDays

ERA5 almanac — 8 years of real data

Miami in March

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 →

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.