Climate Insights for Iwata

The climate in Iwata is temperate. The average annual temperature is 18°C and approximately 2133mm of precipitation falls per year. Iwata receives a notable amount of rainfall throughout the year, including during its driest month. Iwata 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 January, February, December, when temperatures can drop to 3°C.

Temperatures in Iwata vary considerably across the year, with a 30°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 33°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 3°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Iwata is a very wet location, receiving approximately 2133mm of precipitation annually, which averages out to around 178mm per month. The wettest month is June, averaging 318mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 55mm. That's 262mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Iwata is mildly breezy, with an average annual wind speed of 12km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/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 16km/h in winter, 13km/h in spring, 10km/h in summer, 11km/h in autumn.

It is currently summer in Iwata, which began on June 21, 2026. Iwata 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 33°C, while the coldest stretch bottoms out in January near 3°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The table below shows monthly climate averages for Iwata 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. 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.