Castle Rock Weather in September

Castle Rock in September sees high temperatures, with highs around 23°C (73°F) and overnight lows of 9°C (48°F). Overall perfect conditions make it one of the better months to visit.

Rainfall in Castle Rock in September

Historically, September sees about 10 days of rain, with a monthly average of 53 mm (2.1 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Castle Rock in September

Castle Rock has perfect weather in September, with days reaching 23°C (73°F) and nights cooling to 9°C (48°F). September is known for being in the summer season. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Castle Rock in September

The month enjoys around 236 hours of sunshine, creating mostly sunny days with good weather conditions.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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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 9°C (48°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 32%  

Precipitation 53 mm (2.1 in)  

Rainy days 10 days  

Sunshine 236 hours *  

Percentage Sunshine *  

* Data from: Astoria, the United States of America (71 KM, 44 Miles).

What to Wear in Castle Rock in September

For Castle Rock in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

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

4/10

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

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