ERA5 almanac comparison — 8 years of real data
Costa Rica — Manuel Antonio vs Naples: weather in September
Naples edges out Costa Rica — Manuel Antonio for sun in September: 9% clear historically versus 0% (8-year ERA5 average, a 9-point gap). Costa Rica — Manuel Antonio also sees measurably more rain than Naples this month (92% vs 72% of days). Both are viable — Naples is the safer bet.
Costa Rica — Manuel Antonio
Costa Rica
- Clear days, September
- 0%
- Sample size
- n=240 days
- Avg high
- 83°F
- Early September (1st–15th)
- 0%
- Late September (16th–end)
- 0%
- Rain frequency
- 92% of days
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
Frequently asked
Is Costa Rica — Manuel Antonio or Naples warmer in September?
Naples runs warmer by day in September. Costa Rica — Manuel Antonio averages highs of 83°F (highs n=240 days); Naples averages highs of 88°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Costa Rica — Manuel Antonio or Naples in September?
Costa Rica — Manuel Antonio is measurably wetter than Naples. Days with measurable rain: Costa Rica — Manuel Antonio 92%, Naples 72% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Costa Rica — Manuel Antonio or Naples?
Naples edges out Costa Rica — Manuel Antonio for sun in September: 9% clear historically versus 0% (8-year ERA5 average, a 9-point gap). Costa Rica — Manuel Antonio also sees measurably more rain than Naples this month (92% vs 72% of days). Both are viable — Naples is the safer bet.
Compare Costa Rica — Manuel Antonio vs Naples 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.