Monthly climate averages for Osaka, Japan. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewOsaka, Japan in December has mild conditions, with highs averaging 10.9°C (52°F) and noticeably cooler mornings. Sea temperature stays cool at 12.2°C (54°F).
This month falls at the beginning of Winter.
Daily highs in December gradually drop from around 13°C (55°F) at the start to 9°C (49°F) by month's end.
Rainfall is heaviest during the last third of the month, while the first third tends to be drier.
The warmest days tend to fall around the 1th, averaging 13.3°C (56°F).
Compared to November, this month is about 6°C cooler with 1 fewer rainy days. Temperatures begin dropping heading into January.
Daily averages based on historical data (2016–2025)
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 2°C | 5°C / -2°C | 6days (49 mm) Good | 7.6h Good | 74% Muggy | 3.3 Moderate | Poor | View Details |
| February | 10°C / 2°C | 6°C / -1°C | 7days (60 mm) Good | 7.9h Good | 72% Muggy | 4.1 Moderate | Poor | View Details |
| March | 14°C / 5°C | 12°C / 3°C | 10days (103 mm) Wet | 8.4h Good | 72% Muggy | 4.9 Moderate | Fair | View Details |
| April | 19°C / 10°C | 18°C / 9°C | 10days (138 mm) Wet | 8.9h Good | 72% Muggy | 6 High | Good | View Details |
| May best | 23°C / 15°C | 24°C / 15°C | 10days (164 mm) Wet | 9.1h Good | 73% Muggy | 6.1 High | Excellent | View Details |
| June best | 27°C / 20°C | 29°C / 22°C | 13days (215 mm) Wet | 8.7h Good | 78% Humid | 6.5 High | Excellent | View Details |
| July | 31°C / 24°C | 35°C / 29°C | 15days (222 mm) Wet | 9.3h Good | 80% Humid | 7.6 Very High | Wet | View Details |
| August | 32°C / 25°C | 37°C / 30°C | 12days (163 mm) Wet | 10.4h Excellent | 76% Humid | 7.3 Very High | Poor | View Details |
| September | 29°C / 22°C | 32°C / 25°C | 13days (170 mm) Wet | 8.4h Good | 78% Humid | 6.4 High | Good | View Details |
| October best | 22°C / 15°C | 23°C / 15°C | 11days (171 mm) Wet | 7.7h Good | 77% Humid | 4.7 Moderate | Excellent | View Details |
| November best | 17°C / 9°C | 15°C / 7°C | 7days (63 mm) Good | 7.8h Good | 76% Humid | 3.6 Moderate | Good | View Details |
| December | 11°C / 4°C | 8°C / 1°C | 6days (47 mm) Good | 7.4h Good | 75% Muggy | 3.1 Moderate | Fair | View Details |
Bundle up with a warm coat, scarf, and closed-toe shoes. Thermal layers underneath give flexibility between indoors and outdoors.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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