Climate Insights for Sanmenxia

The climate in Sanmenxia is temperate. The average annual temperature is 14°C and approximately 591mm of precipitation falls per year. June is the wettest month, receiving around 95mm of rainfall. Sanmenxia is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -5°C. Light snow can occur between January and December.

Sanmenxia has a wide annual temperature range, spanning 36°C from the coldest to warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to -5°C and the daily average is -1°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 7°C shift in average temperatures.

Sanmenxia is a relatively dry area, receiving approximately 591mm of precipitation annually, which averages out to around 49mm per month. The wettest month is June, averaging 95mm of rainfall. September and August also tend to see above-average precipitation. The driest month is December, with just 8mm. That's 88mm 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. Light snowfall can occur between January and December, totalling around 33cm annually. January is the snowiest month with approximately 15cm.

Sanmenxia 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 April, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Sanmenxia, which began on June 21, 2026. Sanmenxia 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 July at around 31°C, while the coldest stretch bottoms out in January near -5°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.

The best time to visit Sanmenxia is during April, May, June and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 69mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to -5°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 Sanmenxia 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.