ERA5 almanac comparison — 8 years of real data
Las Vegas vs Savannah: weather in September
Las Vegas is the clear winner for sun in September: 92% of days historically clear versus just 32% in Savannah — a 60-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Las Vegas this month (50% vs 3% of days). This isn't close.
Las Vegas
NV
- Clear days, September
- 92%
- Sample size
- n=240 days
- Avg high
- 98°F
- Early September (1st–15th)
- 88%
- Late September (16th–end)
- 95%
- Rain frequency
- 3% of days
Savannah
GA
- Clear days, September
- 32%
- Sample size
- n=240 days
- Avg high
- 85°F
- Early September (1st–15th)
- 28%
- Late September (16th–end)
- 37%
- Rain frequency
- 50% of days
Frequently asked
Is Las Vegas or Savannah warmer in September?
Las Vegas runs warmer by day in September. Las Vegas averages highs of 98°F (highs n=240 days); Savannah averages highs of 85°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Las Vegas or Savannah in September?
Savannah is measurably wetter than Las Vegas. Days with measurable rain: Las Vegas 3%, Savannah 50% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Las Vegas or Savannah?
Las Vegas is the clear winner for sun in September: 92% of days historically clear versus just 32% in Savannah — a 60-point gap across 8 years of ERA5 data. Savannah also sees measurably more rain than Las Vegas this month (50% vs 3% of days). This isn't close.
Compare Las Vegas vs Savannah 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.