Iiyama Weather in August
Iiyama in August sees high temperatures, with highs around 29°C (84°F) and overnight lows of 20°C (68°F). With the rainy season in full effect, expect around 197 mm (7.8 in) of rainfall and regular showers throughout the month.
Rainfall in Iiyama in August
As part of the rainy season, Iiyama sees around 19 days of rain in August, with an average of 197 mm (7.8 in). Rainfall this month is frequent and tends to be fairly heavy when it does fall. Packing waterproofs is a good idea.
Temperature in Iiyama in August
Temperatures in Iiyama in August top out at 29°C (84°F) and drop to 20°C (68°F) overnight. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights cool down to 20°C (68°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. This month tends to be the warmest of the year. Light, comfortable clothing will serve you well.
Sunshine in Iiyama in August
Enjoy a sunny month with about 197 hours of sunshine, even though this month falls in the wet season. There is still enough sun to enjoy the outdoors.If your ideal day consists of dry skies and pleasant temperatures, May typically offers the best circumstances for Iiyama.
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 Iiyama's climate page.
Iiyama Temperature in August
Min Temperature
20°C (68°F)
Max Temperature
29°C (84°F)
Chance of Rain
63%
Precipitation
197 mm (7.8 in)
Rainy days
19 days
Humidity
77% *
Sunshine
197 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Iiyama typically stay consistent throughout August, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 22°C (72°F).
Average temperatures in August
Daily Historical Precipitation
49-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 Iiyama in August
Browse day-by-day weather records for Iiyama spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Iiyama historical weather extremes in August
Based on 19 years of weather observations in Iiyama between 2006 and 2025, these are the recorded extremes.
- The hottest August day on record in Iiyama reached 36°C (97°F) (August 23, 2018).
- On August 14, 2021, Iiyama saw its coldest August day with temperatures maxing out at 22°C (72°F).
- The coldest night in August in Iiyama was on August 18, 2018, with a minimum of 14°C (57°F).
- The heaviest August precipitation occurred on August 13, 2021, when 87 mm (3.4 in) of precipitation fell.
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 Iiyama 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Iiyama 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 Iiyama's climate page.
Temperature Rainfall Sunshine Humidity
See the full Iiyama climate overview or explore weather in Japan.
