Last updated: August 23, 2025
In December, the average temperature in Nankoku, Japan is a crisp 10°C (50°F), with temperatures ranging from a cool 2°C (36°F) to a pleasant 21°C (70°F). Expect about 67 mm (2.7 in) of precipitation over 6 days, contributing to an average humidity of 77%. Whether you're enjoying the refreshing air or preparing for a little rain, this month offers a unique charm to experience!
In December in Nankoku, the average temperature is 10°C (50°F), with maximums reaching 21°C (70°F) and minimums dipping as low as 2°C (36°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.
In Nankoku in December, the precipitation amount is 67 mm (2.7 in) over the course of 6 days, indicating a moderate level of rainfall for the region during that time.
In Nankoku in December, humidity is 77%. With an average temperature of 10°C (50°F), this humidity feels like a thick, heavy blanket enveloping you, making travel uncomfortable and sticky, as it clings to your skin and clothes, turning each step into a challenge.
In Nankoku in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Nankoku for better planning.
UV Risk Categories
Weather in Nankoku varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Nankoku, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (46°F) | 54 mm (2.1 inches) | 74% | moderate |
| February Weather | 8°C (47°F) | 86 mm (3.4 inches) | 70% | high |
| March Weather | 12°C (54°F) | 147 mm (5.8 inches) | 70% | very high |
| April Weather | 15°C (60°F) | 170 mm (6.7 inches) | 76% | extreme |
| May Weather | 19°C (67°F) | 206 mm (8.1 inches) | 82% | extreme |
| June Weather | 22°C (73°F) | 286 mm (11.3 inches) | 86% | extreme |
| July Weather | 26°C (79°F) | 523 mm (20.6 inches) | 91% | extreme |
| August Weather | 27°C (82°F) | 298 mm (11.7 inches) | 88% | extreme |
| September Weather | 25°C (77°F) | 262 mm (10.3 inches) | 85% | very high |
| October Weather | 20°C (69°F) | 251 mm (9.9 inches) | 82% | high |
| November Weather | 15°C (59°F) | 63 mm (2.5 inches) | 79% | high |
| December Weather | 10°C (50°F) | 67 mm (2.7 inches) | 77% | moderate |