Mild
Average highs are around 20°C, so days are mild rather than hot.
May verdict
Mixed for holiday weather
Average highs are around 20°C, so days are mild rather than hot. Sunshine averages 6.2h per day, enough for a balanced month. Rainfall averages 71mm, which is relatively low for holiday planning.

Monthly averages
Temp
20°C
Rain
71mm
Sun
6.2h
Sea
18°C
Weather score
47
Mixed
Mild
Average highs are around 20°C, so days are mild rather than hot.
Drier
Rainfall averages 71mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 6.2h per day, enough for a balanced month.
Cool sea
Sea temperatures average 18°C, so the water can feel cool.
Map
Compare Knysna, South Africa with nearby places by weather score, rain, sun, temperature, and swim conditions.
May20°C average high
May is close to Knysna's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJanuary to March and December
This stretch sets the upper range for average daytime heat.
May71mm average rain
May sits on the drier side of Knysna's year, which helps with sightseeing and transfers.
Driest monthsJanuary to July and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
May6.2 hours average sun
May is one of Knysna's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJanuary to February and November to December
This stretch has the strongest sunshine in the monthly averages.
May18°C average sea
May is below Knysna's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJanuary to March and December
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
May47 weather score
May scores below Knysna's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to March and December
These months have the strongest weather score in the monthly averages.