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SunnyDays

ERA5 almanac comparison — 8 years of real data

Houston vs Jackson Hole: weather in September

Essentially a tie in September: Houston is 30% clear historically, Jackson Hole is 34% clear (8-year ERA5 average) — within the noise. Avg high 88°F vs 70°F. Houston also sees measurably more rain than Jackson Hole this month (50% vs 23% 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.

Houston

TX

Clear days, September
30%
Sample size
n=240 days
Avg high
88°F
Early September (1st–15th)
28%
Late September (16th–end)
32%
Rain frequency
50% of days

Jackson Hole

WY

Clear days, September
34%
Sample size
n=240 days
Avg high
70°F
Early September (1st–15th)
48%
Late September (16th–end)
21%
Rain frequency
23% of days

Compare Houston vs Jackson Hole 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.