ERA5 almanac comparison — 8 years of real data
Newport Beach vs Sea Island: weather in September
Newport Beach is the clear winner for sun in September: 70% of days historically clear versus just 32% in Sea Island — a 38-point gap across 8 years of ERA5 data. Sea Island also sees measurably more rain than Newport Beach this month (53% vs 7% of days). This isn't close.
Newport Beach
CA
- Clear days, September
- 70%
- Sample size
- n=240 days
- Avg high
- 76°F
- Early September (1st–15th)
- 82%
- Late September (16th–end)
- 59%
- Rain frequency
- 7% of days
Sea Island
GA
- Clear days, September
- 32%
- Sample size
- n=240 days
- Avg high
- 83°F
- Early September (1st–15th)
- 26%
- Late September (16th–end)
- 37%
- Rain frequency
- 53% of days
Frequently asked
Is Newport Beach or Sea Island warmer in September?
Sea Island runs warmer by day in September. Newport Beach averages highs of 76°F (highs n=240 days); Sea Island averages highs of 83°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Newport Beach or Sea Island in September?
Sea Island is measurably wetter than Newport Beach. Days with measurable rain: Newport Beach 7%, Sea Island 53% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Newport Beach or Sea Island?
Newport Beach is the clear winner for sun in September: 70% of days historically clear versus just 32% in Sea Island — a 38-point gap across 8 years of ERA5 data. Sea Island also sees measurably more rain than Newport Beach this month (53% vs 7% of days). This isn't close.
Compare Newport Beach vs Sea 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.