December weather forecast
Knysna, South Africa

December welcomes the zenith of summer, mirroring the elevated temperatures of November with marginally reduced rainfall of 63mm (2.48") over 13 days. The vibrant energy of Knysna pulsates with life as summer arrives in full swing. Longer daylight hours complement the rich sun-soaked landscapes, making outdoors particularly inviting. The allure of the sea grows stronger due to warmer temperatures, paving way for exciting water sports. As the year concludes, Knysna remains vibrant and full of joy, offering unforgettable memories to its visitors.

Temperature

Knysna's shift into December is marked by a subtle change to a still warm 25°C (77°F) from November's 23°C (73.4°F) in temperature. Knysna records a steady low-temperature average of 14°C (57.2°F) during December.

Rainfall

In December, the rain falls for 13 days. Throughout December, 63mm (2.48") of precipitation is accumulated. In Knysna, South Africa, during the entire year, the rain falls for 145 days and collects up to 719mm (28.31") of precipitation.

Sea temperature

In Knysna, in December, the average water temperature is 19.9°C (67.8°F).
Note: Most individuals do not find swimming at 19.9°C (67.8°F) to be enjoyable. As the water temperature declines below 21°C (69.8°F), maintaining control over one's breathing becomes harder.

Daylight

December has the longest days of the year in Knysna, with an average of 14h and 24min of daylight.
On the first day of the month, sunrise is at 05:09 and sunset at 19:24. On the last day of December, in Knysna, sunrise is at 05:19 and sunset at 19:42 SAST.

Sunshine

In December, the average sunshine is 9h.

UV index

January and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an excessive health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 12 during December leads to these advisories:
Ensure all key precautions. Defense against sun exposure is critical. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays.