ERA5 almanac comparison — 8 years of real data
Puerto Vallarta vs Scottsdale: weather in October
Scottsdale is the clear winner for sun in October: 83% of days historically clear versus just 22% in Puerto Vallarta — a 61-point gap across 8 years of ERA5 data. Puerto Vallarta also sees measurably more rain than Scottsdale this month (51% vs 7% of days). This isn't close.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific October. For this
week’s actual forecast, each destination links to its live page below.
Puerto Vallarta
MX
- Clear days, October
- 22%
- Sample size
- n=248 days
- Avg high
- 86°F
- Early October (1st–15th)
- 15%
- Late October (16th–end)
- 29%
- Rain frequency
- 51% of days
Scottsdale
AZ
- Clear days, October
- 83%
- Sample size
- n=248 days
- Avg high
- 89°F
- Early October (1st–15th)
- 77%
- Late October (16th–end)
- 88%
- Rain frequency
- 7% of days
Compare Puerto Vallarta vs Scottsdale 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.