The hottest month in Knysna is February when the average maximum temperature is 25°, average temperature is 20° and average minimum temperature is 17°.
The coolest month in Knysna is July when the average maximum temperature is 19°, average temperature is 13° and average minimum temperature is 8°.
The longest days in Knysna are in December, with an average of 14.4 hours of daylight per day. June has the shortest days with an average of 9.9 hours of daylight per day.
The sunniest days in Knysna are in January which has the most hours of sunshine per day with an average of 10.5 hours of sunshine per day, making it a very sunny and pleasant month with long bright days. June has the least sunshine with an average of 5.2 hours of sunshine per day, making it a sunny month that is overcast at times.
The ultraviolet index is the highest in January when it reaches 14.1 and lowest in June when it reaches 3.1.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in Knysna are found in January when they peak at 22° and lowest in August when they dip to 17°.
The sea is best for swimming between December and May when the temperature is above 19° which is cool for swimming, shorty wetsuit may help you extend your time in the water.
The wettest month in Knysna is October with 1.6cm of rain and November has the most days of rain with 12.7 days with some rain, a slightly wet time to visit the beach.
The driest month in Knysna is September with 0.2cm of rain and May has the fewest days of rain with 8.5 days with some rain, a dry time to visit the beach.
The most humid month in Knysna is February with a dew point (an indicator of humidity) of 19° which is somewhat uncomfortable for most people in cities but fine on a beach.
The least humid month in Knysna is July with a dew point of 10° which is very comfortable.
The most windy month in Knysna is November when the average maximum windspeed is 26kmh and the average wind speed is 12kmh.
The least windy month in Knysna is May when the average maximum windspeed is 22kmh and the average wind speed is 11kmh.