Climate Insights for Iwaizumi

The climate in Iwaizumi is cool. The average annual temperature is 10°C and approximately 1316mm of precipitation falls per year. Iwaizumi receives a notable amount of rainfall throughout the year, including during its driest month. Iwaizumi 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 -5°C. Snowfall occurs from January to December, with around 118cm accumulating over the season.

Temperatures in Iwaizumi vary considerably across the year, with a 30°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 25°C with a mean of 22°C. The coldest month is February, when overnight lows fall to -5°C and the daily average is -2°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Iwaizumi is a fairly wet location, receiving approximately 1316mm of precipitation annually, which averages out to around 110mm per month. The wettest month is August, averaging 208mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 55mm. That's 153mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 118cm accumulating over the season. January typically sees the most snow at around 29cm.

Iwaizumi is mildly breezy, with an average annual wind speed of 17km/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 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 11km/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 21km/h in winter, 18km/h in spring, 13km/h in summer, 16km/h in autumn.

It is currently spring in Iwaizumi, which began on March 20, 2026. Iwaizumi 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 25°C, while the coldest stretch bottoms out in February near -5°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Iwaizumi 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.