Climate Insights for Harrismith

The climate in Harrismith is warm and mild. The average annual temperature is 24°C and approximately 187mm of precipitation falls per year. May is the wettest month, receiving around 31mm of rainfall. Harrismith 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: June, July, May. The coldest months are March, April, July, when temperatures can drop to 10°C.

Temperatures in Harrismith vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is June, when average highs reach 35°C and the mean temperature sits around 27°C. March is the coolest month, with minimum temperatures around 10°C and an average of 15°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between February and March, with a 9°C shift in average temperatures.

Harrismith is a quite dry location, receiving approximately 187mm of precipitation annually, which averages out to around 16mm per month. The wettest month is May, averaging 31mm of rainfall. October and August also tend to see above-average precipitation. The driest month is June, with just 0mm. That's 31mm less than May, 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.

Harrismith 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 November, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 5km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 3km/h in winter, 6km/h in spring, 6km/h in summer, 2km/h in autumn.

It is currently winter in Harrismith, which began on June 21, 2026. Harrismith 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 June at around 35°C, while the coldest stretch bottoms out in March near 10°C. Spring is next, beginning on September 23, 2026 (16 days from now).

The best time to visit Harrismith is during January, February, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 16mm per month. By contrast, June can be uncomfortably hot with highs reaching 35°C, while March is the coldest period with lows dropping to 10°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Harrismith 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.