Harrismith Weather Forecast
- 23
- 39
Partly cloudy
- 22
- 40
Partly cloudy
- 18
- 32
Partly cloudy
- 14
- 29
Partly cloudy
- 13
- 31
Partly cloudy
- 14
- 27
Partly cloudy
- 11
- 29
Partly cloudy
Today 15 Dec Great Southern
Mostly sunny. Slight chance of a shower in the southwest, becoming less likely early this evening. Near zero chance of rain elsewhere. The chance of a thunderstorm, possibly severe with damaging winds and heavy rain which may lead to flash flooding. Winds north to northwesterly 25 to 35 km/h tending northwest to northeasterly 15 to 25 km/h in the evening then becoming light in the late evening.
Harrismith Temperature Statistics View More
December Temperature
Lake Grace (59km)
Lowest 6 December, 2025
10.8 °CAverage December
21.5 °CHighest 2 December, 2025
37.3 °C
Climate (2020–Present)
Lake Grace (59km)
Average Low 2020–2025
10.4 °CAverage 2020–2025
16.5 °CAverage High 2020–2025
23.9 °C