ERA5 almanac comparison — 8 years of real data
Cancún vs San Antonio: weather in October
San Antonio is the clear winner for sun in October: 49% of days historically clear versus just 10% in Cancún — a 39-point gap across 8 years of ERA5 data. Cancún also sees measurably more rain than San Antonio this month (70% vs 26% of days). This isn't close.
Cancún
Mexico
- Clear days, October
- 10%
- Sample size
- n=248 days
- Avg high
- 85°F
- Early October (1st–15th)
- 5%
- Late October (16th–end)
- 15%
- Rain frequency
- 70% of days
San Antonio
TX
- Clear days, October
- 49%
- Sample size
- n=248 days
- Avg high
- 84°F
- Early October (1st–15th)
- 58%
- Late October (16th–end)
- 40%
- Rain frequency
- 26% of days
Frequently asked
Is Cancún or San Antonio warmer in October?
Cancún runs warmer by day in October. Cancún averages highs of 85°F (highs n=248 days); San Antonio averages highs of 84°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or San Antonio in October?
Cancún is measurably wetter than San Antonio. Days with measurable rain: Cancún 70%, San Antonio 26% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in October, Cancún or San Antonio?
San Antonio is the clear winner for sun in October: 49% of days historically clear versus just 10% in Cancún — a 39-point gap across 8 years of ERA5 data. Cancún also sees measurably more rain than San Antonio this month (70% vs 26% 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.