Salmonsdam Nature Reserve
- Annual mean
- 16.8 °C
- Warmest month
- February
- Wettest month
- July
Standardized monthly climate averages for temperature, precipitation, and wind patterns.
The climate profile provides a twelve-month overview of atmospheric conditions at a representative coordinate within the Dyer Island Nature Reserve Complex. Recorded data covers mean, minimum, and maximum temperatures alongside precipitation rates, relative humidity, wind speeds, and daylight hours based on NASA POWER records from 1991 to 2020. These metrics establish a consistent baseline for understanding annual environmental rhythms rather than current weather or forecasts.

Long-term monthly temperature averages and daily precipitation rates across the twelve-month cycle.
Compare long term temperature bounds, average daily precipitation, relative humidity, wind speed, and calculated daylight across the calendar year.
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | 20.7 °C14.8° to 31.9° | 0.9 mm/day | 71.2% | 5.7 m/s | 14 hours |
| February | 20.9 °C15.1° to 33° | 0.8 mm/day | 72.5% | 5.6 m/s | 13.3 hours |
| March | 19.6 °C13.3° to 32.1° | 1.3 mm/day | 74.9% | 5.2 m/s | 12.2 hours |
| April | 17.4 °C10.9° to 30.3° | 1.5 mm/day | 76.6% | 5 m/s | 11.1 hours |
| May | 15.6 °C9.3° to 26.8° | 1.5 mm/day | 78.4% | 4.9 m/s | 10.2 hours |
| June | 13.6 °C7.7° to 23.4° | 2 mm/day | 77.7% | 5.3 m/s | 9.7 hours |
| July | 12.9 °C6.5° to 22.4° | 2 mm/day | 78.7% | 5.3 m/s | 9.9 hours |
| August | 13.1 °C6.8° to 23.5° | 1.8 mm/day | 79% | 5.5 m/s | 10.7 hours |
| September | 14.3 °C8.3° to 26.5° | 1.2 mm/day | 77.2% | 5.6 m/s | 11.8 hours |
| October | 16.1 °C9.5° to 28.7° | 1.6 mm/day | 74.6% | 5.7 m/s | 12.9 hours |
| November | 17.6 °C11.5° to 30.2° | 1.5 mm/day | 72.3% | 5.8 m/s | 13.9 hours |
| December | 19.6 °C13.4° to 31.2° | 1.1 mm/day | 71.3% | 5.7 m/s | 14.3 hours |
See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.
Comparing long term monthly averages for temperature, precipitation, humidity, wind speed, and daylight duration
Interactive climate map
Open the climate map to compare monthly temperature, precipitation, and other averages.
Analyze long-term monthly climate normals across diverse regional settings and protected areas.





Learn about the protected status and landscape features of the Dyer Island Nature Reserve Complex. This MoriAtlas destination provides an in-depth view of the rocky islets, marine channels, and coastal biodiversity that define this essential protected zone within the Western Cape of South Africa.