Climate Insights for Kaiyuan

The climate in Kaiyuan is warm and mild. The average annual temperature is 18°C and approximately 1065mm of precipitation falls per year. August is the wettest month, receiving around 236mm of rainfall. Kaiyuan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, June, August. The coldest months are December, January, February, when temperatures can drop to 7°C.

Temperatures in Kaiyuan vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is May, when average highs reach 28°C and the mean temperature sits around 23°C. December is the coolest month, with minimum temperatures around 7°C and an average of 12°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 4°C shift in average temperatures.

Kaiyuan is a moderately rainy area, receiving approximately 1065mm of precipitation annually, which averages out to around 89mm per month. The wettest month is August, averaging 236mm of rainfall. July and June also tend to see above-average precipitation. The driest month is February, with just 11mm. That's 225mm less than August, 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.

Kaiyuan is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in Kaiyuan, which began on June 21, 2026. Kaiyuan 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 May at around 28°C, while the coldest stretch bottoms out in December near 7°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Kaiyuan is during March, April, May, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 53mm per month. By contrast, December can be quite cold with temperatures dropping to 7°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Kaiyuan 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.