Climate Insights for Iwaki

The climate in Iwaki is temperate. The average annual temperature is 15°C and approximately 1595mm of precipitation falls per year. Iwaki receives a notable amount of rainfall throughout the year, including during its driest month. Iwaki is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, December, when temperatures can drop to 4°C. Light snow can occur between January and March.

Temperatures in Iwaki vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 26°C and the mean temperature sits around 25°C. February is the coolest month, with minimum temperatures around 4°C and an average of 6°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between November and December, with a 5°C shift in average temperatures.

Iwaki is a fairly wet location, receiving approximately 1595mm of precipitation annually, which averages out to around 133mm per month. The wettest month is October, averaging 212mm of rainfall. September and May also tend to see above-average precipitation. The driest month is February, with just 60mm. That's 152mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and March, totalling around 19cm annually. March is the snowiest month with approximately 8cm.

Iwaki is mildly breezy, with an average annual wind speed of 16km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 20km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 19km/h in winter, 17km/h in spring, 13km/h in summer, 15km/h in autumn.

It is currently summer in Iwaki, which began on June 21, 2026. Iwaki is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 26°C, while the coldest stretch bottoms out in February near 4°C. Autumn is next, beginning on September 23, 2026 (3 days from now).

The table below shows monthly climate averages for Iwaki based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.