Rocky Mountain National Park weather in September
Cool, with occasional showers. Average highs of 17°C and lows of 3°C, with around 8 rainy days expected throughout the month.
While September isn't our top-rated month for Rocky Mountain National Park, it has its own appeal — typically lower prices, fewer crowds, and a more local feel.
Average high
17°C
Average low
3°C
Rainy days
8 days
Best months to visit
Year-round
What to do in Rocky Mountain National Park in September
Whatever the weather, Rocky Mountain National Park rewards curious visitors. Here are some of the best ways to spend your time:
Trail Ridge Road scenic driving: 12,000-foot alpine vistas
Emerald Lake trail hiking: subalpine lake and waterfall views
Glacier Gorge trail: cirque lakes and glacier remnants hiking
Moraine Park wildlife viewing: elk and wildlife spotting
Longs Peak mountaineering: 14,255-foot summit attempt
Backcountry camping: high-altitude wilderness overnight
What to pack for September
Layer up — a mid-weight jacket, jumpers, and comfortable trousers. Waterproof shoes are recommended. Scarves and gloves may be useful in the evenings.
Browse other months
January
-4C
Cold, with occasional showers.
February
-3C
Cold, with some rainy days.
March
1C
Cold, with some rainy days.
April
4C
Cold, with some rainy days.
May
8C
Cold, with regular rainfall.
June
17C
Cool, with some rainy days.
July
20C
Mild and comfortable, with regular rainfall.
August
19C
Mild and comfortable, with regular rainfall.
September (you are here)
17C
Cool, with occasional showers.
October
8C
Cold, with occasional showers.
November
1C
Cold, with occasional showers.
December
-3C
Cold, with some rainy days.
Book your September trip to Rocky Mountain National Park
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