Climate Overview
The climate in Isshōchi is temperate. The average annual temperature is 17°C and approximately 2367mm of precipitation falls per year. Isshōchi receives a notable amount of rainfall throughout the year, including during its driest month. Isshōchi 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.
Temperature
Temperatures in Isshōchi vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 32°C and the mean temperature sits around 28°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 November and December, with a 6°C shift in average temperatures.
Precipitation
Isshōchi is a very wet location, receiving approximately 2367mm of precipitation annually, which averages out to around 197mm per month. The wettest month is June, averaging 493mm of rainfall. July and May also tend to see above-average precipitation. The driest month is December, with just 81mm. That's 412mm 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.
Wind
Isshōchi is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.
Seasons
89 days until Summer
It is currently spring in Isshōchi, which began on March 20, 2026. Isshōchi 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 32°C, while the coldest stretch bottoms out in January near 3°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 8 to 24°C. Rainfall is heavy, totalling around 555mm across the season with a monthly average of 185mm. Winds are generally light, averaging 14km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 20 to 32°C. Rainfall is heavy, totalling around 1099mm across the season with a monthly average of 366mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 10 to 29°C. Rainfall is heavy, totalling around 440mm across the season with a monthly average of 147mm. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 3 to 12°C. Precipitation is moderate at around 272mm for the season, averaging 91mm per month. Winds are generally light, averaging 15km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Isshōchi 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.
