Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
Iriomote Weather in September
Iriomote in September averages 29°C (84°F) during the day and 27°C (81°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Iriomote in September
Climate statistics over the past 30 years suggest around 21 days of rain, with 241 mm (9.5 in) average for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Iriomote in September
If you're visiting Iriomote in September, expect highs of 29°C (84°F) and overnight lows around 27°C (81°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 27°C (81°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.
Sunshine in Iriomote in September
With about 180 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, June, October, November and December typically offer the best circumstances for Iriomote.
Iriomote Temperature in September
Min Temperature
27°C (81°F)
Max Temperature
29°C (84°F)
Chance of Rain
70%
Precipitation
241 mm (9.5 in)
Rainy days
21 days
Humidity
80%
Sunshine
180 hours
Percentage Sunshine
Iriomote Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Iriomote - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Iriomote typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Iriomote in September
Browse day-by-day weather records for Iriomote spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Iriomote historical weather extremes in September
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Iriomote.
- The warmest day in September was on September 12, 2025, with a maximum of 34°C (93°F).
- On September 28, 2020, Iriomote saw its coldest September day with temperatures maxing out at 25°C (77°F).
- Nighttime temperatures dropped to 21°C (70°F) on September 27, 1997, marking the coldest September night on record.
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Iriomote in September
Warm but pleasant conditions in Iriomote in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Iriomote in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Iriomote 3-Day Forecast
More climate data for Iriomote
Temperature Rainfall Sunshine Humidity
See the full Iriomote climate overview or explore weather in Japan.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
The famous bamboo forests of Arashiyama
The famous bamboo forests of Arashiyama lie just outside the city center of Kyoto and is unique in the world. If you look at photos of this bamboo forest, it looks like you have landed in a fairy-tale world.
10 reasons why you should visit Japan in winter
Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.