ERA5 almanac comparison — 8 years of real data
Mérida vs Mexico City: weather in May
Mérida edges out Mexico City for sun in May: 47% clear historically versus 33% (8-year ERA5 average, a 14-point gap). Mexico City also sees measurably more rain than Mérida this month (35% vs 19% of days). Both are viable — Mérida is the safer bet.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific May. For this
week’s actual forecast, each destination links to its live page below.
Mérida
MX
- Clear days, May
- 47%
- Sample size
- n=248 days
- Avg high
- 97°F
- Early May (1st–15th)
- 62%
- Late May (16th–end)
- 33%
- Rain frequency
- 19% of days
Mexico City
MX
- Clear days, May
- 33%
- Sample size
- n=248 days
- Avg high
- 83°F
- Early May (1st–15th)
- 37%
- Late May (16th–end)
- 29%
- Rain frequency
- 35% of days
Compare Mérida vs Mexico City in another month
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.