ERA5 almanac comparison — 8 years of real data
Cancún vs San Antonio: weather in July
San Antonio is the clear winner for sun in July: 44% of days historically clear versus just 11% in Cancún — a 33-point gap across 8 years of ERA5 data. Cancún also sees measurably more rain than San Antonio this month (50% vs 29% of days). This isn't close.
Cancún
Mexico
- Clear days, July
- 11%
- Sample size
- n=248 days
- Avg high
- 88°F
- Early July (1st–15th)
- 12%
- Late July (16th–end)
- 10%
- Rain frequency
- 50% of days
San Antonio
TX
- Clear days, July
- 44%
- Sample size
- n=248 days
- Avg high
- 95°F
- Early July (1st–15th)
- 38%
- Late July (16th–end)
- 50%
- Rain frequency
- 29% of days
Frequently asked
Is Cancún or San Antonio warmer in July?
San Antonio runs warmer by day in July. Cancún averages highs of 88°F (highs n=248 days); San Antonio averages highs of 95°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or San Antonio in July?
Cancún is measurably wetter than San Antonio. Days with measurable rain: Cancún 50%, San Antonio 29% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in July, Cancún or San Antonio?
San Antonio is the clear winner for sun in July: 44% of days historically clear versus just 11% in Cancún — a 33-point gap across 8 years of ERA5 data. Cancún also sees measurably more rain than San Antonio this month (50% vs 29% of days). This isn't close.
Compare Cancún vs San Antonio 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 forecast for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.