Iiyama weather in September (Nagano, Japan)

How's the weather trend in Iiyama as September approaches? Want to know if this month is ideal for visiting? Our guide provides detailed weather information.

Temperatures

Typically, September in Iiyama includes high temperatures and heavy rainfall. Enjoy the summer season during this month. Expect temperatures to climb to 25°C during the day, with nighttime readings dropping to 16°C.

Precipitation

Iiyama in September falls under the rainy season with heavy rainfall, averaging around 209 mm for the month. You can typically expect 20 days days of rain this month, based on climate records.

Average sunshine

With about 128 hours of sunshine, the area enjoys a nice balance of sun and clouds, creating a pleasant environment.

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 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 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.

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 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 travel conditions. Find out where to go with our weather planner.