Iwanai Weather in September

September in Iwanai brings pleasant temperatures, with highs of 22°C (72°F) and nights dropping to 15°C (59°F). Rainfall is on the higher side this month, averaging around 161 mm (6.3 in), so keep a rain jacket handy.

Rainfall in Iwanai in September

Expect around 18 days of rain based on historical data, with 161 mm (6.3 in) average. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Iwanai in September

If you're visiting Iwanai in September, expect highs of 22°C (72°F) and overnight lows around 15°C (59°F). This month falls in the summer season. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to around 15°C (59°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Iwanai in September

The area experiences a moderate amount of sunshine, with approximately 161 hours of sunlight expected. This means a decent mix of sun and overcast.

If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Iwanai.

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• January
• February
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• May
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• October
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For a detailed overview over the year and the best time to visit Japan, check out our Iwanai's climate page.

Iwanai Temperature in September

Min Temperature 15°C (59°F)  

Max Temperature 22°C (72°F)  

Chance of Rain 60%  

Precipitation 161 mm (6.3 in)  

Rainy days 18 days  

Humidity 71% *  

Sunshine 161 hours *  

Percentage Sunshine *  

* Data from: Sapporo, Japan (69 KM, 43 Miles).

What to Wear in Iwanai in September

For Iwanai in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Iwanai in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Iwanai's climate page.

More climate data for Iwanai

Temperature Rainfall Sunshine Humidity

See the full Iwanai climate overview or explore weather in Japan.