ERA5 almanac comparison — 8 years of real data
Naples vs Palm Desert: weather in September
Palm Desert is the clear winner for sun in September: 94% of days historically clear versus just 9% in Naples — a 85-point gap across 8 years of ERA5 data. Naples also sees measurably more rain than Palm Desert this month (72% vs 4% of days). This isn't close.
Naples
FL
- Clear days, September
- 9%
- Sample size
- n=240 days
- Avg high
- 88°F
- Early September (1st–15th)
- 6%
- Late September (16th–end)
- 12%
- Rain frequency
- 72% of days
Palm Desert
CA
- Clear days, September
- 94%
- Sample size
- n=240 days
- Avg high
- 101°F
- Early September (1st–15th)
- 93%
- Late September (16th–end)
- 94%
- Rain frequency
- 4% of days
Frequently asked
Is Naples or Palm Desert warmer in September?
Palm Desert runs warmer by day in September. Naples averages highs of 88°F (highs n=240 days); Palm Desert averages highs of 101°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Naples or Palm Desert in September?
Naples is measurably wetter than Palm Desert. Days with measurable rain: Naples 72%, Palm Desert 4% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Naples or Palm Desert?
Palm Desert is the clear winner for sun in September: 94% of days historically clear versus just 9% in Naples — a 85-point gap across 8 years of ERA5 data. Naples also sees measurably more rain than Palm Desert this month (72% vs 4% of days). This isn't close.
Compare Naples vs Palm Desert 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.