Iiyama weather in September (Nagano, Japan)

How is the weather in Iiyama in September? Check out this comprehensive weather guide.

In September, Iiyama generally has high temperatures and heavy rainfall. September is a summer month. Daytime temperatures hover around 25°C, while nights can cool down to about 16°C.

Iiyama in September falls under the rainy season with heavy rainfall, averaging around 209 mm for the month. Rain is expected on roughly 20 days.

The area experiences a moderate amount of sunshine, with approximately 128 hours of sunlight expected. This makes it neither too gloomy nor overly bright.

If you prefer dry days with pleasant temperatures, May typically offers the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

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

 

Iiyama, monthly averages in September

Min Temperature 16°C  

Max Temperature 25°C  

Chance of Rain 67%  

Precipitation 209 mm  

Rainy days 20 days  

Humidity 79% *  

Sunshine 128 hours *  

Percentage Sunshine *  

* Data from: Joetsu, Japan (30 KM, 18 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 Iiyama in September?

For visitors traveling to Iiyama, 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 Iiyama.

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.