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SunnyDays

ERA5 almanac comparison — 8 years of real data

Dallas vs Lake Tahoe: weather in September

Essentially a tie in September: Dallas is 48% clear historically, Lake Tahoe is 48% clear (8-year ERA5 average) — within the noise. Avg high 90°F vs 72°F. Dallas also sees measurably more rain than Lake Tahoe this month (30% vs 10% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.

What you are reading: 8-year historical averages, not a forecast. Either destination can still surprise you this specific September. For this week’s actual forecast, each destination links to its live page below.

Dallas

TX

Clear days, September
48%
Sample size
n=240 days
Avg high
90°F
Early September (1st–15th)
46%
Late September (16th–end)
51%
Rain frequency
30% 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

Compare Dallas 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 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.