Iiyama Weather in January
Iiyama in January averages 3°C (37°F) during the day and -5°C (23°F) at night. January is part of the rainy season, and falls within the winter season, so frequent snow/rainfall is typical.
Rainfall in Iiyama in January
As part of the rainy season, Iiyama sees around 25 days of rain in January, with an average of 202 mm (8 in). The rainy season here brings regular, substantial showers. It's worth being prepared for rain on most days you're out.
Temperature in Iiyama in January
Iiyama in January gets highs of 3°C (37°F) during the day and drops to -5°C (23°F) at night. January is part of winter. Even daytime conditions remain cold, making layers, a warm coat, and winter accessories a good idea. At -5°C (23°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating. Since it's the coldest month of the year, you'll want to bundle up with extra layers and winter clothing.
Sunshine in Iiyama in January
The area experiences limited sunny days, amounting to roughly 67 hours of sunshine. This makes it perfect for those who lean towards cooler, cloudier settings rather than intense sunlit days.If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Iiyama. 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 Iiyama's climate page.
Iiyama Temperature in January
Min Temperature
-5°C (23°F)
Max Temperature
3°C (37°F)
Chance of Rain
83%
Precipitation
202 mm (8 in)
Rainy days
25 days
Humidity
78% *
Sunshine
67 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2026)
Based on our historical records, temperatures in Iiyama typically stay consistent throughout January, with daily highs averaging around 3°C (37°F). Nights are very cold, with lows around -2°C (28°F).
Average temperatures in January
Daily Historical Precipitation
50-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Iiyama in January
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 January
Our historical data for Iiyama spans 2006 to 2025, revealing these weather extremes.
- The warmest day in January was on January 4, 2016, with a maximum of 14°C (57°F).
- Iiyama experienced its chilliest January day on January 25, 2023, reaching only -3°C (27°F).
- The coldest night in January in Iiyama was on January 15, 2014, with a minimum of -10°C (14°F).
- Peak precipitation in January occurred on January 13, 2017, when 59 mm (2.3 in) of precipitation was measured.
Best Places in Japan in January
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in January →
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What to Wear in Iiyama in January
Dress warmly and in layers for your trip to Iiyama in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. It's going to pour! Pack a good poncho and prepare for very wet conditions. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.What To Do in Iiyama in January
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.
