Climate Insights for Gariep Dam

The climate in Gariep Dam is temperate. The average annual temperature is 17°C and approximately 376mm of precipitation falls per year. February is the wettest month, receiving around 62mm of rainfall. Gariep Dam is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: January, December, February. The coldest months are July, June, August, when temperatures can drop to 2°C.

Temperatures in Gariep Dam vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 31°C and the mean temperature sits around 24°C. July is the coolest month, with minimum temperatures around 2°C and an average of 9°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 5°C shift in average temperatures.

Gariep Dam is a quite dry location, receiving approximately 376mm of precipitation annually, which averages out to around 31mm per month. The wettest month is February, averaging 62mm of rainfall. January and April also tend to see above-average precipitation. The driest month is August, with just 7mm. That's 56mm less than February, 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.

Gariep Dam is moderately windy, with an average annual wind speed of 22km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 26km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 21km/h in winter, 25km/h in spring, 24km/h in summer, 20km/h in autumn.

It is currently autumn in Gariep Dam, which began on March 20, 2026. Gariep Dam is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in January at around 31°C, while the coldest stretch bottoms out in July near 2°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Gariep Dam is during January, February, March, April, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 40mm per month. By contrast, July can be quite cold with temperatures dropping to 2°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 Gariep Dam 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.