Koshu weather in September (Yamanashi, Japan)

Interested in knowing the climate of Koshu in September? Our page offers a comprehensive look at the weather you can expect this month.

Temperatures

Typically, September in Koshu includes high temperatures and heavy rainfall. September is part of the summer season. Daytime temperatures hover around 23°C, while nights can cool down to about 15°C.

Precipitation

Koshu in September falls under the rainy season with heavy rainfall, averaging around 240 mm for the month. Known for its peak rainfall, this month often has intense showers. It's wise to carry a poncho to protect yourself from the rain. This month experiences about 19 days of rain according to historical data.

Average sunshine

The area enjoys a moderate level of sunlight, with around 152 hours. It's a good balance between sunny and cloudy days.

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

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

 

Koshu, monthly averages in September

Min Temperature 15°C  

Max Temperature 23°C  

Chance of Rain 64%  

Precipitation 240 mm  

Rainy days 19 days  

Humidity 71% *  

Sunshine 152 hours *  

Percentage Sunshine *  

* Data from: Yamanashi, Japan (4 KM, 2 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 Koshu, 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 Koshu.

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.