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SunnyDays

ERA5 almanac comparison — 8 years of real data

Mexico City vs Scottsdale Desert Ridge: weather in September

Scottsdale Desert Ridge is the clear winner for sun in September: 82% of days historically clear versus just 4% in Mexico City — a 78-point gap across 8 years of ERA5 data. Mexico City also sees measurably more rain than Scottsdale Desert Ridge this month (84% vs 10% 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 September. For this week’s actual forecast, each destination links to its live page below.

Mexico City

MX

Clear days, September
4%
Sample size
n=240 days
Avg high
73°F
Early September (1st–15th)
2%
Late September (16th–end)
6%
Rain frequency
84% of days

Scottsdale Desert Ridge

AZ

Clear days, September
82%
Sample size
n=240 days
Avg high
98°F
Early September (1st–15th)
82%
Late September (16th–end)
82%
Rain frequency
10% of days

Compare Mexico City vs Scottsdale Desert Ridge 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.