Honshu (Japan) in general has a mild continental climate. The day temperatures range from 9 °C (48 °F) in January to 32 °C (90 °F) in August. The driest month is November with just 9 days of rain, on the contrary, the month when it rains the most is July with 14 days of rain. Temperatures during the night go from 1 °C (34 °F) in January to 24 °C (75 °F) in August.
The best time to visit Honshu is between May and June. In this period day temperatures range from 24 °C (74 °F) to 27 °C (80 °F), night temperatures from 14 °C (58 °F) to 19 °C (66 °F) and you can expect on average 12 days of rain per month and 5 of sunshine on average per day.
The hottest month in Honshu is August with a temperature of 32 °C (90 °F). The period with the highest daytime temperatures is in Honshu during July - August. The temperatures range at this time between 30 °C (86 °F) - 32 °C (90 °F).
The period, which is the sunniest in Honshu, is in the months of July - September, when there is an average of 5 sun hours per day.
Honshu belongs to destinations with lower humidity. It ranges from 64 % to 78 %. The most humid months are June - August and the least humid are February - April.
The least cloudy months in Honshu are July - September, when the cloud cover is on average only 60 %.
The highest temperatures during the night in Honshu could be expected between July and August. During this time the night temperatures are between 23 °C (73 °F) - 24 °C (75 °F).
Yes, it is likely to be freezing at night in Honshu in the months of January - February.
Honshu is a destination with rather light or moderate winds.