Isahaya Weather in December

Isahaya in December sees moderate temperatures, with highs around 14°C (57°F) and overnight lows of 8°C (46°F). Rainfall is fairly high at around 89 mm (3.5 in) on average, so pack waterproofs just in case.

Rainfall in Isahaya in December

Historically, the month has about 19 days of rain, averaging 89 mm (3.5 in) in total. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.

Temperature in Isahaya in December

Daytime temperatures in Isahaya reach 14°C (57°F) in December, dropping to 8°C (46°F) at night. During December, the winter season is in full swing. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Isahaya in December

The area enjoys a moderate level of sunlight, with around 114 hours. It's a good balance between sunny and cloudy days.

Wind Speed in Isahaya in December

Average wind conditions reach 2 m/s (4 knots) in December. This creates comfortable weather with light winds that gently move vegetation. Keep in mind this is an average. Daily conditions range from near-calm to more noticeable wind.

Average water temperature in December

With water at 18°C (64°F), swimming is comfortable for most people. It feels refreshing rather than cold, though it depends a bit on personal preference.

If your ideal day consists of dry skies and pleasant temperatures, October typically offers the best circumstances for Isahaya.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Isahaya's climate page.

Isahaya Temperature in December

Min Temperature 8°C (46°F)  

Max Temperature 14°C (57°F)  

Water Temperature 18°C (64°F) *  

Chance of Rain 62%  

Precipitation 89 mm (3.5 in)  

Rainy days 19 days  

Humidity 67% *  

Windspeed 2 m/s (4 knots) *  

Sunshine 114 hours *  

Percentage Sunshine 34% *  

* Data from: Nagasaki, Japan (23 KM, 14 Miles).

What to Wear in Isahaya in December

Pack for changing conditions in Isahaya in December. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 18°C (64°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Isahaya in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Isahaya's climate page.

More climate data for Isahaya

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Isahaya climate overview or explore weather in Japan.