Karuizawa weather in September (Nagano, Japan)

How does the weather in Karuizawa usually fare in September? Find out what kind of weather to expect during this month.

Temperatures

Typically, September in Karuizawa includes high temperatures and heavy rainfall. September is typically considered a summer month. The daytime often sees temperatures reaching 24°C, but nighttime brings a cool-down to 15°C.

Precipitation

Karuizawa in September falls under the rainy season with heavy rainfall, averaging around 224 mm for the month. This month experiences about 20 days of rain according to historical data.

Average sunshine

The city usually sees around 142 hours of sunlight, indicating a moderately sunny period.

If your ideal day consists of dry skies and moderate temperatures May generally stands out with the best circumstances. While January, February, March and December tend to showcase less optimal conditions.

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

 

Karuizawa, monthly averages in September

Min Temperature 15°C  

Max Temperature 24°C  

Chance of Rain 66%  

Precipitation 224 mm  

Rainy days 20 days  

Humidity 74% *  

Sunshine 142 hours *  

Percentage Sunshine *  

Data from: Nagano, Japan (52 KM, 32 Miles).

Where to go in Japan in September

Find out more about the weather in Japan and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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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 Karuizawa, 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. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

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

Swimming

7/10

Camping

6/10

Interested in more climate information?

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

Our site offers climate and forecast data for every country in the world. Are you going to Japan? On this website you can find historical weather averages for many cities in Japan. 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.