Iiyama Weather in May
May in Iiyama sees daytime temperatures around 21°C (70°F) and lows of 10°C (50°F) at night. With around 142 mm (5.6 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Iiyama in May
This month experiences about 17 days of rain according to historical data, averaging 142 mm (5.6 in). This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Iiyama in May
May in Iiyama brings pleasant temperatures, with highs of 21°C (70°F) and nights around 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 10°C (50°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Iiyama in May
There are approximately 198 hours of sunshine this month, resulting in mostly clear days.If you favor pleasant temperatures and minimal rainfall, May is one of the best months to visit 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 May
Min Temperature
10°C (50°F)
Max Temperature
21°C (70°F)
Chance of Rain
56%
Precipitation
142 mm (5.6 in)
Rainy days
17 days
Humidity
71% *
Sunshine
198 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Iiyama typically stay consistent throughout May, with daily highs averaging around 21°C (70°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 14°C (57°F).
Average temperatures in May
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 May
Historical weather for Iiyama in May
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 May
Our historical data for Iiyama spans 2006 to 2026, revealing these weather extremes.
- The hottest May day on record in Iiyama reached 33°C (91°F) (May 18, 2023).
- On May 1, 2013, Iiyama saw its coldest May day with temperatures maxing out at 10°C (50°F).
- The coldest night in May in Iiyama was on May 10, 2026, with a minimum of 3°C (37°F).
- The wettest day in May Iiyama was on May 28, 2024 with 59 mm (2.3 in) of precipitation.
Best Places in Japan in May
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in May →
perfect weather
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tolerable
unpleasant
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What to Wear in Iiyama in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Iiyama in May
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.
