When is the best time to go to Iwanai
The chart above shows the best time of year to visit Iwanai, 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 Iwanai
Iwanai weather by month
Please note our recommendations for when to visit Iwanai 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 |
|---|---|---|---|
| -4°C | 160mm | 2.1hrs | 10.5hrs |
January in Iwanai is generally wet with the temperature being cold.
Based on weather alone, this is probably a time of year to avoid going to Iwanai for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
January is in the winter in Iwanai and is typically the coldest month of the year. Daytime maximum temperatures average around a freezing -4°C (25°F), whilst at night -11°C (13°F) is normal.
On average January is the driest month of the year in Iwanai with around 160mm 6.3 inches of rain making it a wet time to visit. This rainfall is typically spread over 30 days, although this may vary considerably.
On the flip side this corresponds to an average of 2.1 hours of sunshine per day.
February
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -3°C | 120mm | 3hrs | 11.5hrs |
February in Iwanai is generally damp with the temperature being cold.
Based on weather alone, this is probably a time of year to avoid going to Iwanai for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
February is in the winter in Iwanai and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a freezing -3°C (26°F), whilst at night -11°C (12°F) is normal.
On average February is the 2nd driest month of the year in Iwanai with around 120mm 4.7 inches of rain making it a damp time to visit. This rainfall is typically spread over 27 days, although this may vary considerably.
On the flip side this corresponds to an average of 3 hours of sunshine per day.
March
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 1°C | 88mm | 5hrs | 12.8hrs |
The weather in March in Iwanai is characteristically cold and a little damp.
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 Iwanai.
March is in the spring in Iwanai and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a freezing 1°C (33°F), whilst at night -7°C (20°F) is normal.
On average March is the 3rd driest month of the year in Iwanai with around 88mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 26 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
April
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 7°C | 76mm | 6.4hrs | 14.3hrs |
Iwanai's weather in April is typically cool and reasonably dry in nature.
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 Iwanai.
April is in the spring in Iwanai and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cold 8°C (46°F), whilst at night -1°C (30°F) is normal.
On average April is the 4th driest month of the year in Iwanai with around 76mm 3 inches of rain making it a reasonably dry 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 6.4 hours of sunshine per day.
May
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 13°C | 74mm | 6.8hrs | 15.6hrs |
May is a reasonably dry month in Iwanai and the temperature is generally cool.
It is perhaps a good month to visit Iwanai, with some surprisingly good weather at this time of year.
May is in the spring in Iwanai and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 5°C (40°F) is normal.
On average May is the 5th driest month of the year in Iwanai with around 74mm 2.9 inches of rain making it a reasonably dry 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 6.8 hours of sunshine per day.
June
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 16°C | 76mm | 6.3hrs | 10.5hrs |
The climate in Iwanai during June can be summarized as mild and reasonably dry.
It is perhaps the perfect month to visit Iwanai, with some particularly good weather at this time of year.
June is in the summer in Iwanai and is typically the 6th coldest month of the year. Daytime maximum temperatures average around 18°C (64°F), whilst at night 10°C (49°F) is normal.
On average June is the 6th driest month of the year in Iwanai with around 76mm 3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.3 hours of sunshine per day.
July
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 20°C | 106mm | 5.5hrs | 11.5hrs |
July in Iwanai is generally damp with the temperature being warm.
It is perhaps the perfect month to visit Iwanai, with some extremely good weather at this time of year.
July is in the summer in Iwanai and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 15°C (58°F) is normal.
On average July is the 6th wettest month of the year in Iwanai with around 106mm 4.2 inches of rain making it a damp time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.5 hours of sunshine per day.
August
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 21°C | 155mm | 5.4hrs | 12.8hrs |
The weather in August in Iwanai is characteristically warm and wet.
It is perhaps the perfect month to visit Iwanai, with some extremely good weather at this time of year.
August is in the summer in Iwanai and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 23°C (74°F), whilst at night 16°C (60°F) is normal.
On average August is the 5th wettest month of the year in Iwanai with around 155mm 6.1 inches of rain making it a 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.
September
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 17°C | 148mm | 5.9hrs | 14.3hrs |
Iwanai's weather in September is typically mild and wet in nature.
It is perhaps a good month to visit Iwanai, with some very good weather at this time of year.
September is in the fall / autumn in Iwanai and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 19°C (67°F), whilst at night 10°C (51°F) is normal.
On average September is the 4th wettest month of the year in Iwanai with around 148mm 5.8 inches of rain making it a 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 5.9 hours of sunshine per day.
October
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 12°C | 139mm | 5.1hrs | 15.6hrs |
October is a wet month in Iwanai and the temperature is generally cool.
Although outside the main holiday season, there is still plenty of pretty acceptable weather around this time of year. This makes it an okay time to visit Iwanai.
October is in the fall / autumn in Iwanai and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 13°C (55°F), whilst at night 4°C (39°F) is normal.
On average October is the 3rd wettest month of the year in Iwanai with around 139mm 5.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.1 hours of sunshine per day.
November
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 5°C | 159mm | 2.8hrs | 10.5hrs |
November is a wet month in Iwanai and the temperature is generally cool.
Based on weather alone, this is probably a time of year to avoid going to Iwanai for your holidays. The weather is often not a good and not conducive to spending time outdoors.
November is in the fall / autumn in Iwanai and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a cold 5°C (42°F), whilst at night -2°C (28°F) is normal.
On average November is the 2nd wettest month of the year in Iwanai with around 159mm 6.2 inches of rain making it a wet time to visit. This rainfall is typically spread over 25 days, although this may vary considerably.
On the flip side this corresponds to an average of 2.8 hours of sunshine per day.
December
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -1°C | 164mm | 1.8hrs | 11.5hrs |
December in Iwanai is generally wet with the temperature being cold.
Based on weather alone, this is probably a time of year to avoid going to Iwanai for your holidays. The weather is often not a good and not conducive to spending time outdoors.
December is in the winter in Iwanai and is typically the warmest month of the year. Daytime maximum temperatures average around a freezing -1°C (30°F), whilst at night -8°C (19°F) is normal.
On average December is the wettest month of the year in Iwanai with around 164mm 6.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 29 days, although this may vary considerably.
On the flip side this corresponds to an average of 1.8 hours of sunshine per day.
Other monthly averages
Iwanai weather stats
| Hottest month: | August | 23.2°C 73.8°F |
|---|---|---|
| Driest month: | May | 74mm 2.9ins |
| Sunniest month: | April | 6.4hrs |
| Coldest month: | January | -4°C 24.8°F |
| Wettest month: | December | 164mm 6.5ins |
| Warmest sea: | August | 21.7°C 71.1°F |
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