Iriomote Weather in August
August in Iriomote averages 30°C (86°F) during the day and 28°C (82°F) at night. It is the wettest month of the year, with 245 mm (9.6 in) of rainfall on average, so waterproof gear is a must.
Rainfall in Iriomote in August
Prepare for the heaviest rain of the year this month, which often comes in heavy showers. A poncho is a smart choice to stay dry. Typically, you can expect about 21 days of rain this month, with 245 mm (9.6 in) on average. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Iriomote in August
August in Iriomote brings very high temperatures, with highs of 30°C (86°F) and nights around 28°C (82°F). For most visitors, the main thing to prepare for is the heat during the day. Nights are warm at 28°C (82°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Iriomote in August
Expect a lot of sunshine this month, with about 217 hours of sun. These sunny conditions add to the overall experience.If you prefer dry days with pleasant temperatures, August may not be the ideal month to visit Iriomote. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Iriomote's climate page.
Iriomote Temperature in August
Min Temperature
28°C (82°F)
Max Temperature
30°C (86°F)
Chance of Rain
71%
Precipitation
245 mm (9.6 in)
Rainy days
21 days
Humidity
83%
Sunshine
217 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Iriomote typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in August
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 August
Historical weather for Iriomote in August
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 August
Based on 49 years of weather observations in Iriomote between 1976 and 2025, these are the recorded extremes.
- The hottest August day on record in Iriomote reached 35°C (95°F) (August 21, 1981).
- On August 30, 2010, Iriomote saw its coldest August day with temperatures maxing out at 27°C (81°F).
- Iriomote registered its coldest August night on August 18, 1982, with temperatures dropping to 21°C (70°F).
Best Places in Japan in August
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in August →
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What to Wear in Iriomote in August
Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Iriomote in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Iriomote's climate page.
Temperature Rainfall Sunshine Humidity
See the full Iriomote climate overview or explore weather in Japan.
