Denver Weather in September

During September, Denver experiences high daytime temperatures of 25°C (77°F) and cooler nights around 14°C (57°F). Expect quite a bit of rainfall. Around 113 mm (4.4 in) is typical.

Rainfall in Denver in September

Records from the past 30 years suggest around 10 days of rain, with 113 mm (4.4 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Denver in September

In September, expect high temperatures in Denver, with highs of 25°C (77°F) and lows of 14°C (57°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Denver in September

Enjoy a sunny month with about 226 hours of sunshine, the clear skies make Denver even more beautiful.

For Denver itself, May generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
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• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Denver's climate page.

Denver Temperature in September

Min Temperature 14°C (57°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 33%  

Precipitation 113 mm (4.4 in)  

Rainy days 10 days  

Humidity 73% *  

Sunshine 226 hours *  

Percentage Sunshine 61% *  

* Data from: Harrisburg, the United States of America (63 KM, 39 Miles).

What to Wear in Denver in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Denver in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Denver's climate page.

More climate data for Denver

Temperature Rainfall Sunshine Humidity

See the full Denver climate overview or explore weather in the United States of America.