Koshu weather in September (Yamanashi, Japan)

Curious about the September weather in Koshu? Wondering if it's an optimal time for a visit? This page provides detailed information on the weather conditions for that month.

In September, Koshu typically experiences high temperatures and heavy rainfall. September falls within the summer season. Daytime temperatures hover around 23°C, while nights can cool down to about 15°C.

Koshu in September falls under the rainy season with heavy rainfall, averaging around 240 mm for the month. In this month, the heaviest downpours of the year are not uncommon. Carrying a poncho might be your best bet to stay dry. Delving into the climate records from the past 30 years, one can predict that nearly 19 days of the month will see rainfall.

The area enjoys a balanced 152 hours of sunlight. Ensuring it's neither too overcast nor too sunny.

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 in September and which places have the best weather 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 Koshu in September?

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 in September.

Swimming

7/10

Camping

6/10

Interested in more climate information?

Weather and Climate 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 climate conditions. Find out where to go with our weather planner.