Station Information

Station ID: 950
Latitude: -34.049444
Longitude: 23.045556
Coastline code: 430
Station code: 86
Time span of data:
Completeness (%): 0
Date of last update: 10 Feb 2021

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Tide Gauge Data

Download metric sea level data. Use only with extreme caution.
NOTE: If some of the data are red in the plots above, the 'flag for attention' is set. Please see the documentation below.

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Knysna 430/086 RLR(1964) is 9.7m below BM SAN1

Documentation added 1996-08-28

For discussions of MSL changes and extreme sea levels around Namibia and South Africa, see: G.B.Brundrit, S.Afr.J.Mar.Sci.,16,9-17,1995 and S.Searson and G.B.Brundrit, S.Afr.J.of Science, 91,579-588,1995. 1960 - 1972 VALUES BASED ON 8 READINGS PER DAY

Documentation added 2006-11-28

Station flagged data generally suspect. Large spike in dataset Nov/Dec 2002 values very suspect.

Documentation added 2009-09-24

Heights of chart datum relative to land levelling datum in South Africa and Namibia: Knysna Datum: up to 31st Dec 1978 = -0.625 Datum: 1st Jan 1979 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -1.048 Datum: 1st Jan 2003 onwards = -0.788 Datum is now LAT so unlikely to change.

Documentation added 2010-05-11

There appears to be a spike in Nov/Dec 2002 see above. This is possibly real as it appears in several of the S. African stations.

Documentation added 2019-11-07

The South African Navy Hydrographic Office (SANHO) are the copyright owners of the Knysna sea level data and must be contacted to request permission to use the data.

Documentation added 2021-02-10

"The South African Hydrographic Office have asked us to remove this record in line with the Hydrographic Act of 2019 (Act No. 35 of 2019) and the South African Spatial Data Infrastructure Act, 2003 (Act No. 54 of 2003). The data can be obtained directly from SANHO (email:

Data Authority

Hydrographic Office
Maritime Headquarters
Private Bag X1
Tokai 7966