Honeydew Pools
Swimming Pool construction and Pool Services
since 1986

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Monthly Swimming Pool Evaporation

Evaporation of pool water will greatly vary depending on a number of factors such as geographic location, walls around pool, surface wind, air temperature, water temperature/pool heating, water features, infinity edges, time of year etc. We expect evaporation to be somewhere between 5mm and 50mm per week depending on what combination of the above factors are applicable to your situation.
Below is a table from the SA weather bureau allowing some comparison.

Annual Average Rainfall, Evaporation and Temperature for Johannesburg International Airport (1961-1990) 
(Weather Bureau, 1991).

 

Rainfall (mm)

Evaporation (mm)

Temperature
(
° C)

January

125

221.8

25.6

February

90

182.4

27.4

March

91

171.9

26.3

April

54

135.0

23.2

May

13

129.4

20.7

June

9

109.0

17.7

July

4

123.2

18.5

August

6

169.9

21.4

September

27

217.9

24.9

October

72

246.1

26.0

November

117

222.7

26.6

December

105

230.9

27.7

Annual Average

713

2 160.0

23,8

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