Best: Jun, Aug-Oct · Great: Jul
Weather shifts through genuine seasons here, from January's cool stretch to July's warmth, with rain a little heavier around May and lighter around January — real variation, but nothing as sharp as a true monsoon or Mediterranean dry season. In September, expect highs around 25°C with rain on roughly 7 days of the month.
Yellowstone's geysers and Grand Teton's mountain scenery are the headline draws, alongside hiking and wildlife-watching throughout the Rockies.
Try Rocky Mountain elk and trout, hearty mountain-region specialties.
Daylight, sunrise, and sunset are calculated exactly from this region's latitude. Temperature and rainfall are modeled from its general climate type, not measured station data. Month summaries are generated from those modeled figures.
Expect cool days around 6°/-8°C, with occasional rain (~5 rainy days).
Expect cool days around 8°/-6°C, with occasional rain (~5 rainy days).
Expect cool days around 12°/-3°C, with occasional rain (~8 rainy days).
Expect mild days around 16°/2°C, with frequent rain (~10 rainy days).
Expect mild days around 21°/7°C, with frequent rain (~12 rainy days).
Expect warm days around 27°/12°C, with occasional rain (~9 rainy days).
Expect hot days around 31°/16°C, with occasional rain (~9 rainy days).
Expect warm days around 30°/15°C, with occasional rain (~8 rainy days).
Expect warm days around 25°/9°C, with occasional rain (~7 rainy days).
Expect mild days around 18°/3°C, with occasional rain (~6 rainy days).
Expect cool days around 11°/-2°C, with occasional rain (~6 rainy days).
Expect cool days around 6°/-7°C, with occasional rain (~6 rainy days).