Climate Insights for Koga

The climate in Koga is temperate. The average annual temperature is 18°C and approximately 2093mm of precipitation falls per year. Koga receives a notable amount of rainfall throughout the year, including during its driest month. Koga 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. Light snow can occur between January and January.

Temperatures in Koga vary considerably across the year, with a 26°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 29°C. February is the coolest month, with minimum temperatures around 5°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Koga is a very wet location, receiving approximately 2093mm of precipitation annually, which averages out to around 174mm per month. The wettest month is September, averaging 358mm of rainfall. June and April also tend to see above-average precipitation. The driest month is August, with just 69mm. That's 289mm less than September, 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. Light snowfall can occur between January and January, totalling around 19cm annually. January is the snowiest month with approximately 18cm.

Koga is relatively calm, with an average annual wind speed of 4km/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 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.

It is currently summer in Koga, which began on June 21, 2026. Koga 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 February near 5°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The table below shows monthly climate averages for Koga 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.