Iwanai Climate by Month
Iwanai experiences great temperature shifts.
The city's weather can transition from warm days
to very cold weather.
It also experiences much rain/snowfall throughout the year.
Let’s explore the climate details in depth to provide you with a complete overview.
Average day and night temperature
The climate in Iwanai is known for significant temperature differences throughout the year, making the weather dynamic. Average daytime temperatures reach a comfortable 25°C in August. In January, the coolest month of the year, temperatures drop to a very cold -1°C. At night, expect cooler temperatures, averaging -7°C during this month.
The mean minimum and maximum temperatures throughout the year
Precipitation and rainy days
Iwanai has a notably wet climate with abundant precipitation, recording 1416 mm of rain/snowfall per year. Iwanai can be quite wet during August, receiving approximately 171 mm of precipitation over 18 rainy days. In contrast April, experiences much drier conditions, with 78 mm of rainfall, spread across 18 rainy days.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Iwanai can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.9 hours of sunlight per day.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is low throughout the year in Iwanai.
Relative humidity over the year
The best time of year to visit Iwanai in Japan
During the months of July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Most rainfall (rainy season) is seen in August and September.
The coldest season / winter is in the following months: January, February and December.
August has an average maximum temperature of 25°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of -1°C.
August tops the wettest month list with 171 mm of rainfall.
April is the driest month with 78 mm of precipitation.
May is the sunniest month with an average of 199 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
