Iriomote Weather in December
During December, Iriomote experiences high daytime temperatures of 24°C (75°F) and cooler nights around 20°C (68°F). Expect quite a bit of rainfall. Around 162 mm (6.4 in) is typical.
Rainfall in Iriomote in December
Expect around 22 days of rain based on historical data, with 162 mm (6.4 in) average. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Iriomote in December
In December, expect high temperatures in Iriomote, with highs of 24°C (75°F) and lows of 20°C (68°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights are mild at around 20°C (68°F), which is comfortable for most people.
Sunshine in Iriomote in December
With limited sunshine this month, there are about 70 hours of sun. It's ideal for those who prefer a cooler, cloudier climate.If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, May, June, October, November and December typically offer the best circumstances for Iriomote.
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 December
Min Temperature
20°C (68°F)
Max Temperature
24°C (75°F)
Chance of Rain
75%
Precipitation
162 mm (6.4 in)
Rainy days
22 days
Humidity
75%
Sunshine
70 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Iriomote typically stay consistent throughout December, with daily highs averaging around 24°C (75°F). Nights are pleasant, with lows typically ranging from 17°C (63°F) to 19°C (66°F).
Average temperatures in December
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 December
Historical weather for Iriomote in December
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 December
Our historical data for Iriomote spans 1976 to 2025, revealing these weather extremes.
- The hottest December day on record in Iriomote reached 28°C (82°F) (December 22, 1984).
- On December 22, 2005, Iriomote saw its coldest December day with temperatures maxing out at 13°C (55°F).
- Iriomote registered its coldest December night on December 30, 1980, with temperatures dropping to 9°C (48°F).
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 →
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What to Wear in Iriomote in December
Comfortable temperatures call for an easy wardrobe in December. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.What To Do in Iriomote in December
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.
