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SunnyDays

ERA5 almanac — 8 years of real data

Mérida in July

Mérida in July: 41% of days see measurable rain, 94°F average high, 20% of days historically clear (n=248, ERA5 2018–2025).

Mérida in July is historically a poor month for sun: only 20% of days clear across 8 years (n=248, avg high 94°F). March is the clearest month for Mérida 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 Mérida 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 Mérida 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		 24% n=120 94°F
Late July
16th–end		 17% n=128 94°F
Full month average 20% n=248 94°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 Mérida 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		 98% n=120
Late July
16th–end		 100% n=128
Full month average 99% n=248
12.0 h median sunshine per day 95% of days exceed 8 h sunshine 41% of days see ≥ 1 mm rain — rain is not hidden
Comparison (old vs new): WMO-code “clear” bar: 20%. Sunshine-based “warm & sunny”: 99%. The 79-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

Mérida is mostly overcast in July historically: only 20% of days are clear across 8 years (n=248), avg high 94°F. If you want sun in Mérida, March is historically much better. Most visitors this month will see more clouds than sun.

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

Every month in Mérida

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

Historical clear-sky % for Mérida, all months, ERA5 2018–2025.
Month % Clear Sample (n)
January 55% n=248 All destinations →
February 61% n=226 All destinations →
March 74% n=248 All destinations →
April 68% n=240 All destinations →
May 47% n=248 All destinations →
June 20% n=240 All destinations →
July ← this page 20% n=248 All destinations →
August 13% n=248 All destinations →
September 8% n=240 All destinations →
October 20% n=248 All destinations →
November 38% n=240 All destinations →
December 53% n=248 All destinations →

Frequently asked

Does it rain in Mérida in July?

Sometimes. Mérida sees measurable rain on 41% of days in July historically (n=248 days, ERA5 2018–2025) — not frequent enough to plan around, but not negligible either.

Is Mérida good for sun in July?

Not usually. Mérida is historically overcast in July: only 20% of days are clear (avg high 94°F, n=248 days, ERA5 2018–2025). March is historically far better for sun here.

How Mérida compares in July

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

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.