When is the best time to go to Kosai
The chart above shows the best time of year to visit Kosai, Japan. These are based on an analysis of weather averages such as temperature, rainfall and number of hours of sunshine. These ratings are based solely on the climate and do not take into account other factors such as accommodation prices and how busy it is likely to be.
Average temperatures in Kosai
Kosai weather by month
Please note our recommendations for when to visit Kosai are based solely on the weather and do not take into accounts accommodation prices, how busy it will be and what events are on.
January
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 9°C | 53mm | 6.6hrs | 11hrs | 18°C |
The weather in January in Kosai is characteristically cool and reasonably dry.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Kosai.
January is in the winter in Kosai and is typically the coldest month of the year. Daytime maximum temperatures average around a cool 10°C (49°F), whilst at night 2°C (35°F) is normal.
On average January is the driest month of the year in Kosai with around 53mm 2.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.6 hours of sunshine per day.
February
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 9°C | 80mm | 6.5hrs | 11.8hrs | 17°C |
February in Kosai is generally a little damp with the temperature being cool.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Kosai.
February is in the winter in Kosai and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 10°C (51°F), whilst at night 2°C (36°F) is normal.
On average February is the 2nd driest month of the year in Kosai with around 80mm 3.1 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.5 hours of sunshine per day.
March
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 12°C | 139mm | 6.5hrs | 12.8hrs | 17°C |
The weather in March in Kosai is characteristically cool and wet.
Based on weather alone, this is probably a time of year to avoid going to Kosai for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
March is in the spring in Kosai and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cool 14°C (56°F), whilst at night 5°C (40°F) is normal.
On average March is the 3rd driest month of the year in Kosai with around 139mm 5.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.5 hours of sunshine per day.
April
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 17°C | 173mm | 6.1hrs | 13.9hrs | 18°C |
Kosai's weather in April is typically mild and wet in nature.
Based on weather alone, this is probably a time of year to avoid going to Kosai for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
April is in the spring in Kosai and is typically the 4th coldest month of the year. Daytime maximum temperatures average around 19°C (66°F), whilst at night 10°C (50°F) is normal.
On average April is the 4th driest month of the year in Kosai with around 173mm 6.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.1 hours of sunshine per day.
May
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 21°C | 197mm | 6.7hrs | 14.8hrs | 21°C |
May is a wet month in Kosai and the temperature is generally warm.
Although outside the main holiday season, there is still plenty of pretty acceptable weather around this time of year. This makes it a good time to visit Kosai.
May is in the spring in Kosai and is typically the 5th coldest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 15°C (58°F) is normal.
On average May is the 5th driest month of the year in Kosai with around 197mm 7.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.7 hours of sunshine per day.
June
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 23°C | 255mm | 5.1hrs | 11hrs | 23°C |
The climate in Kosai during June can be summarized as warm, humid and very wet.
It is perhaps a good month to visit Kosai, with some inordinately good weather at this time of year.
June is in the summer in Kosai and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a muggy 26°C (78°F), whilst at night 19°C (66°F) is normal.
On average June is the 6th driest month of the year in Kosai with around 255mm 10 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.1 hours of sunshine per day.
July
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 26°C | 215mm | 5.8hrs | 11.8hrs | 26°C |
July in Kosai is generally very wet with the temperature being hot.
It is perhaps a good month to visit Kosai, with some extremely good weather at this time of year.
July is in the summer in Kosai and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 23°C (73°F) is normal.
On average July is the 6th wettest month of the year in Kosai with around 215mm 8.5 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
August
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 28°C | 200mm | 7.2hrs | 12.8hrs | 28°C |
The weather in August in Kosai is characteristically hot, humid and very wet.
Based on weather alone, this is probably a time of year to avoid going to Kosai for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
August is in the summer in Kosai and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 24°C (75°F) is normal.
On average August is the 5th wettest month of the year in Kosai with around 200mm 7.9 inches of rain making it a very wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.2 hours of sunshine per day.
September
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 25°C | 207mm | 5.4hrs | 13.9hrs | 27°C |
Kosai's weather in September is typically hot, humid and very wet in nature.
It is perhaps a good month to visit Kosai, with some extremely good weather at this time of year.
September is in the fall / autumn in Kosai and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (81°F), whilst at night 20°C (69°F) is normal.
On average September is the 4th wettest month of the year in Kosai with around 207mm 8.2 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.4 hours of sunshine per day.
October
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 20°C | 150mm | 5.5hrs | 14.8hrs | 24°C |
October is a wet month in Kosai and the temperature is generally warm.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it an okay time to visit Kosai.
October is in the fall / autumn in Kosai and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 15°C (58°F) is normal.
On average October is the 3rd wettest month of the year in Kosai with around 150mm 5.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.5 hours of sunshine per day.
November
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 16°C | 100mm | 5.8hrs | 11hrs | 22°C |
The climate in Kosai during November can be summarized as mild and damp.
Although outside the main holiday season, there is still plenty of fairly acceptable weather around this time of year. This makes it an okay time to visit Kosai.
November is in the fall / autumn in Kosai and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 9°C (48°F) is normal.
On average November is the 2nd wettest month of the year in Kosai with around 100mm 4 inches of rain making it a damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
December
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 11°C | 51mm | 6.4hrs | 11.8hrs | 20°C |
December in Kosai is generally reasonably dry with the temperature being cool.
It is perhaps the perfect month to visit Kosai, with some surprisingly good weather at this time of year.
December is in the winter in Kosai and is typically the warmest month of the year. Daytime maximum temperatures average around a cool 12°C (54°F), whilst at night 4°C (39°F) is normal.
On average December is the wettest month of the year in Kosai with around 51mm 2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.4 hours of sunshine per day.
Other monthly averages
Kosai weather stats
| Hottest month: | August | 30.6°C 87.1°F |
|---|---|---|
| Driest month: | December | 51mm 2ins |
| Sunniest month: | January | 6.6hrs |
| Coldest month: | January | 9.3°C 48.7°F |
| Wettest month: | June | 255mm 10ins |
| Warmest sea: | August | 27.7°C 81.9°F |
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