ERA5 almanac comparison — 8 years of real data
Bozeman vs Lake Tahoe: weather in September
Essentially a tie in September: Bozeman is 48% clear historically, Lake Tahoe is 48% clear (8-year ERA5 average) — within the noise. Avg high 72°F vs 72°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Bozeman
MT
- Clear days, September
- 48%
- Sample size
- n=240 days
- Avg high
- 72°F
- Early September (1st–15th)
- 60%
- Late September (16th–end)
- 35%
- Rain frequency
- 18% of days
Lake Tahoe
CA
- Clear days, September
- 48%
- Sample size
- n=240 days
- Avg high
- 72°F
- Early September (1st–15th)
- 65%
- Late September (16th–end)
- 31%
- Rain frequency
- 10% of days
Frequently asked
Is Bozeman or Lake Tahoe warmer in September?
Equally warm by day in September. Bozeman averages highs of 72°F (highs n=240 days); Lake Tahoe averages highs of 72°F (highs n=240 days) (ERA5 2018–2025). Historical averages, not a forecast.
Does it rain more in Bozeman or Lake Tahoe in September?
Days with measurable rain: Bozeman 18%, Lake Tahoe 10% (n=240 and n=240 days). ERA5 2018–2025; historical, not a forecast.
Which is sunnier in September, Bozeman or Lake Tahoe?
Essentially a tie in September: Bozeman is 48% clear historically, Lake Tahoe is 48% clear (8-year ERA5 average) — within the noise. Avg high 72°F vs 72°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
Compare Bozeman vs Lake Tahoe 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.