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.
Iiyama Weather in December
Thinking of visiting Iiyama in December? Expect low temperatures reaching 6°C (43°F) during the day, dropping to -3°C (27°F) at night. Heavy showers are common during the rainy season.
Rainfall in Iiyama in December
As part of the rainy season, Iiyama sees around 22 days of rain in December, with an average of 187 mm (7.4 in). Rainy season showers tend to be fairly substantial. A good rain jacket or umbrella is worth having with you most days.
Temperature in Iiyama in December
In December, Iiyama gets low temperatures, with highs of 6°C (43°F). Nights cool to around -3°C (27°F). December is part of winter. It stays cool throughout the day, so warm layers are a good idea from morning to evening. At -3°C (27°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating.
Sunshine in Iiyama in December
The city usually sees around 79 hours of sunlight, indicating fewer sunny days.If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Iiyama. Our weather planner can help you explore destinations with more pleasant weather conditions.
Iiyama Temperature in December
Min Temperature
-3°C (27°F)
Max Temperature
6°C (43°F)
Chance of Rain
75%
Precipitation
187 mm (7.4 in)
Rainy days
22 days
Humidity
76% *
Sunshine
79 hours *
Percentage Sunshine
*
* Data from: Joetsu, Japan (30 KM, 18 Miles).
Iiyama Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Iiyama - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Iiyama typically drop from around 10°C (50°F) at the start of December to approximately 5°C (41°F) by the end. Nights are cold, with lows typically ranging from -1°C (30°F) to 3°C (37°F).
Average temperatures in December
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 December
Historical weather records for Iiyama in December
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 December
According to our 19 years of weather records for Iiyama, the following extremes were recorded between 2006 and 2025.
- The warmest day in December was on December 4, 2018, with a maximum of 21°C (70°F).
- The lowest daytime temperature in December was -1°C (30°F), recorded on December 27, 2025.
- Iiyama registered its coldest December night on December 6, 2025, with temperatures dropping to -8°C (18°F).
- Peak precipitation in December occurred on December 27, 2006, when 64 mm (2.5 in) of precipitation was measured.
Best Places in Japan in December
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in December →
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 Iiyama in December
Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! You can probably leave your sunglasses at home, because sunny days are pretty rare this month.
What To Do in Iiyama in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming4/10 -
Cycling3/10 -
Walking3/10 -
Camping1/10 -
Outdoor sports3/10
Iiyama 3-Day Forecast
More climate data for Iiyama
Temperature Rainfall Sunshine Humidity
See the full Iiyama climate overview or explore weather in Japan.
Popular in December
Where to go in December - average daytime high across popular destinations.
Naha
22°C (72°F) Tokyo
13°C (55°F) Osaka13°C (55°F) Hakone
12°C (54°F) Kyoto11°C (52°F) Hakuba
3°C (37°F) Sapporo2°C (36°F) Niseko
1°C (34°F) 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.