Iwanai weather in September (Hokkaido, Japan)

What weather conditions can you expect in Iwanai this September? See what weather conditions to anticipate this month with our guide.

Temperatures

In September, Iwanai tends to experience pleasant temperatures and heavy rainfall. During September, you’ll experience the summer season. Daytime temperatures generally settle around 22°C, while nighttime can see a dip to about 15°C.

Precipitation

Iwanai in September usually receives heavy rainfall, averaging around 161 mm for the month. Expect around 18 days of rain based on historical data.

Average sunshine

Expect a moderate amount of sunlight, with approximately 161 hours. This means a pleasant mix of sun and clouds.

If you favor pleasant temperatures and minimal rainfall, September is one of the better months to visit Iwanai. June, July, August and September typically offer the most agreeable circumstances. On the other hand, January, February, March, April, November and December tend to be characterized by conditions that may not be as optimal.

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

 

Iwanai, monthly averages in September

Min Temperature 15°C  

Max Temperature 22°C  

Chance of Rain 60%  

Precipitation 161 mm  

Rainy days 18 days  

Humidity 71% *  

Sunshine 161 hours *  

Percentage Sunshine *  

* Data from: Sapporo, Japan (69 KM, 43 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 Iwanai, 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

6/10

Camping

6/10

Interested in more climate information?

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

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.