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SunnyDays

ERA5 almanac — 8 years of real data

Miami in July

Miami in July is historically a poor month for sun: only 6% of days clear across 8 years (n=248, avg high 88°F). March is the clearest month for Miami 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 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 July

Clear-sky percentage for Miami in July, split by half-month. “n” is the number of days sampled across 8 years (2018–2025).
Period % Clear days Sample (n) Avg high
Early July
1st–15th		 3% n=120 88°F
Late July
16th–end		 8% n=128 88°F
Full month average 6% n=248 88°F

Sunshine & warmth in July

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 July. Primary: % of days ≥ 72°F with > 6 h of sunshine.
Period Warm & sunny (≥72°F, >6 h sun) Sample (n)
Early July
1st–15th		 95% n=120
Late July
16th–end		 94% n=128
Full month average 94% n=248
12.3 h median sunshine per day 88% of days exceed 8 h sunshine 75% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 6%. Sunshine-based “warm & sunny”: 94%. The 88-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 a poor choice for sun in July: just 6% of days clear historically (n=248). March is the historically strongest month for sun here. The 8-year record is consistent — this is not a fluke bad stretch.

→ See all destinations in March — historically the best month for sun in Miami.

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 32% n=248 All destinations →
April 27% n=240 All destinations →
May 20% n=248 All destinations →
June 2% n=240 All destinations →
July ← this page 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.