ERA5 almanac comparison — 8 years of real data
Cancún vs Kiawah Island: weather in July
Essentially a tie in July: Cancún is 11% clear historically, Kiawah Island is 7% clear (8-year ERA5 average) — within the noise. Avg high 88°F vs 87°F. Kiawah Island also sees measurably more rain than Cancún this month (70% vs 50% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
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
Kiawah Island
SC
- Clear days, July
- 7%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early July (1st–15th)
- 8%
- Late July (16th–end)
- 7%
- Rain frequency
- 70% of days
Frequently asked
Is Cancún or Kiawah Island warmer in July?
Cancún runs warmer by day in July. Cancún averages highs of 88°F (highs n=248 days); Kiawah Island averages highs of 87°F (highs n=248 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Cancún or Kiawah Island in July?
Kiawah Island is measurably wetter than Cancún. Days with measurable rain: Cancún 50%, Kiawah Island 70% (n=248 and n=248 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in July, Cancún or Kiawah Island?
Essentially a tie in July: Cancún is 11% clear historically, Kiawah Island is 7% clear (8-year ERA5 average) — within the noise. Avg high 88°F vs 87°F. Kiawah Island also sees measurably more rain than Cancún this month (70% vs 50% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Cancún vs Kiawah Island 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.