Climate Insights for Guéoul

The climate in Guéoul is hot. The average annual temperature is 27°C and approximately 205mm of precipitation falls per year. September is the wettest month, receiving around 83mm of rainfall. Guéoul is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: October, April, March. The coldest months are January, December, February, when temperatures can drop to 18°C.

Guéoul sees moderate temperature variation throughout the year, ranging from 18°C to 37°C. October is the hottest month, with daytime highs reaching 37°C and an average of 30°C. January is the coolest month, with minimum temperatures around 18°C and an average of 25°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 2°C shift in average temperatures.

Guéoul is a quite dry location, receiving approximately 205mm of precipitation annually, which averages out to around 17mm per month. The wettest month is September, averaging 83mm of rainfall. August and July also tend to see above-average precipitation. The driest month is January, with just 0mm. That's 83mm 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.

Guéoul 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 April, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, 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 2km/h gap between the calmest and windiest months.

It is currently summer in Guéoul, which began on June 21, 2026. Guéoul 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 October at around 37°C, while the coldest stretch bottoms out in January near 18°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Guéoul is during January, when the weather is most comfortable for travellers. During these months, average temperatures hover around 25°C with modest rainfall averaging 0mm per month. By contrast, October can be uncomfortably hot with temperatures reaching 37°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Guéoul 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.