Mill Valley weather in September (California, United States of America)

How is September weather typically in Mill Valley? Wondering about the weather this month? Our guide has all the details you need.

Temperatures

During September, Mill Valley is known for its perfect weather, characterized by high temperatures and low rainfall. Throughout the day, temperatures typically settle at around 24°C. But by evening, they drop to around 12°C. On average, it has the peak temperatures of the year.

Precipitation

Mill Valley in September usually receives low rainfall, averaging around 5 mm for the month. Looking at the last 30 years, the data shows about 2 days with rain.

Average sunshine

The city usually sees around 270 hours of sunlight, indicating many sunny days.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit. May, June, July, August, September and October generally stand out with the best circumstances. While January, February and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Mill Valley climate page with graphs.

 

Mill Valley, monthly averages in September

Min Temperature 12°C  

Max Temperature 24°C  

Chance of Rain 7%  

Precipitation 5 mm  

Rainy days 2 days  

Humidity 73% *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

Data from: San Francisco, the United States of America (35 KM, 21 Miles).

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

Map not visible? Whoops sorry! Please refresh the page.

Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Mill Valley, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings.

What To Do

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

10/10

Outdoor sports

10/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Mill Valley.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.