ERA5 almanac comparison — 8 years of real data
Cancún vs San Antonio: weather in April
Essentially a tie in April: Cancún is 40% clear historically, San Antonio is 36% clear (8-year ERA5 average) — within the noise. Avg high 85°F vs 82°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Cancún
Mexico
- Clear days, April
- 40%
- Sample size
- n=240 days
- Avg high
- 85°F
- Early April (1st–15th)
- 38%
- Late April (16th–end)
- 42%
- Rain frequency
- 26% of days
San Antonio
TX
- Clear days, April
- 36%
- Sample size
- n=240 days
- Avg high
- 82°F
- Early April (1st–15th)
- 40%
- Late April (16th–end)
- 33%
- Rain frequency
- 40% of days
Frequently asked
Is Cancún or San Antonio warmer in April?
Cancún runs warmer by day in April. Cancún averages highs of 85°F (highs n=240 days); San Antonio averages highs of 82°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or San Antonio in April?
Days with measurable rain: Cancún 26%, San Antonio 40% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in April, Cancún or San Antonio?
Essentially a tie in April: Cancún is 40% clear historically, San Antonio is 36% clear (8-year ERA5 average) — within the noise. Avg high 85°F vs 82°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
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.