Castle Rock Weather in September

September in Castle Rock brings high temperatures, with highs of 25°C (77°F) and nights dropping to 8°C (46°F). With perfect weather conditions overall, it's a good time to visit.

Rainfall in Castle Rock in September

Historically, approximately 7 days this month are expected to have rain, averaging 43 mm (1.7 in). A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.

Temperature in Castle Rock in September

September tends to be one of the perfect months in Castle Rock, with 25°C (77°F) in the afternoon and 8°C (46°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to 8°C (46°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Castle Rock in September

The days are predominantly sunny, with an estimated total of around 270 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Castle Rock.

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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 Castle Rock's climate page.

Castle Rock Temperature in September

Min Temperature 8°C (46°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 24%  

Precipitation 43 mm (1.7 in)  

Rainy days 7 days  

Humidity 50% *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

* Data from: Denver, the United States of America (42 KM, 26 Miles).

What to Wear in Castle Rock in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Castle Rock in September

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

Swimming

10/10

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

5/10

Outdoor sports

10/10

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 Castle Rock's climate page.

More climate data for Castle Rock

Temperature Rainfall Sunshine Humidity

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