Hamamatsu weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Fair
Best time to visit: April – June, October – November
What is the weather like in Hamamatsu in December?
In December, Hamamatsu is cool: daytime highs average 12 °C, and nights cool down to about 4 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 71 mm. All in all, December is a so-so month for a holiday in Hamamatsu.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 74 | 55 | 44 |
| Day | 17° | 12° | 10° |
| Night | 9° | 4° | 2° |
| Sea | 21° | 19° | 17° |
| Sun | 6 h | 6 h | 6 h |
| Rain days | 10 | 6 | 6 |
More details for December
- Daylight
- 9 h 51 min06:49 – 16:40
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 35 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %38 %
- Sunshineweight 20 %53 %
- Few rainy daysweight 30 %83 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- A jumper for the evenings
Hamamatsu in December: quick answers
Is Hamamatsu hot in December?
No. In December, Hamamatsu is cool: daytime highs average 12 °C and nights drop to about 4 °C.
Can you swim in Hamamatsu in December?
Only if you don't mind cold water: in December the sea averages just 18.6 °C. Comfortable swimming is possible from June to November.
Does it rain much in Hamamatsu in December?
Rain falls on about 6 days, adding up to 71 mm.
Hamamatsu month by month
The whole year in HamamatsuAll destinations: JapanWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences