Climate Insights for Iwata

The climate in Iwata is temperate. The average annual temperature is 18°C and approximately 2311mm 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 4°C.

Temperatures in Iwata vary considerably across the year, with a 27°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 31°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 4°C and an average of 7°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between November and December, with a 6°C shift in average temperatures.

Iwata is a very wet location, receiving approximately 2311mm of precipitation annually, which averages out to around 193mm per month. The wettest month is June, averaging 340mm of rainfall. July and September also tend to see above-average precipitation. The driest month is December, with just 66mm. That's 274mm 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 19km/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 23km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 17km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h 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 23km/h in winter, 20km/h in spring, 17km/h in summer, 17km/h in autumn.

It is currently spring in Iwata, which began on March 20, 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 31°C, while the coldest stretch bottoms out in January near 4°C. Summer is next, beginning on June 21, 2026 — 89 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.