The Tide Board · Overberg

Hermanus

Tides, waves, sea temperature and weather, as at 23:59 SAST on Fri, 16 Oct.

Sea15,4–15,6 °Cfarm intake, satellite
Waves2,3 m11,6 s, from WSW
Wind25 km/hfrom NW, 308°
Air17 °CCloudy
Next low00:120,65 m, falling now
Sun06:00 · 18:57rise and set; moon 34% lit

Tides

0,00,51,01,5Fri, 16 OctSat, 17 OctSun, 18 Octnow05:4911:4418:0100:1206:3112:3418:5401:1007:5014:3320:45
Fri, 16 Oct
  • High 05:491,37 m
  • Low 11:440,69 m
  • High 18:011,32 m
Sat, 17 Oct
  • Low 00:120,65 m
  • High 06:311,26 m
  • Low 12:340,80 m
  • High 18:541,20 m
Sun, 18 Oct
  • Low 01:100,76 m
  • High 07:501,17 m
  • Low 14:330,88 m
  • High 20:451,12 m

Predicted for the Simon's Town gauge, 78 km away, in metres above chart datum (LAT). Astronomical tide only: wind and pressure can add or take away 20 to 30 cm.

Waves

Height2,3 msignificant wave height
Period11,6 s0,086 Hz, about 5 waves a minute
DirectionWSWfrom 237°

Swell 1,8 m at 10,9 s from W.

0,01,02,03,04,0Sat, 17 OctSun, 18 OctMon, 19 OctTue, 20 OctWed, 21 OctThu, 22 Octnow

Solid line: total sea, in metres. Dashed line: the swell on its own.

DayHighestPeriodFrom
Fri, 16 Oct2,7 m11,9 sWSW 244°
Sat, 17 Oct3,2 m12,8 sSW 233°
Sun, 18 Oct3,2 m13,0 sSW 232°
Mon, 19 Oct2,8 m12,5 sSW 227°
Tue, 20 Oct2,7 m11,5 sSW 220°
Wed, 21 Oct3,8 m11,9 sSW 235°
Thu, 22 Oct3,3 m11,6 sWSW 242°
So far
0,51,01,52,02,53,03,54,04,55,025 Sept26 Sept27 Sept28 Sept29 Sept30 Sept01 Oct02 Oct03 Oct04 Oct05 Oct06 Oct07 Oct08 Oct09 Oct10 Oct11 Oct12 Oct13 Oct14 Oct15 Oct16 Oct17 Octnow

Significant wave height from the same model, as it stood each hour. Metres.

NOAA WaveWatch III at 0,5°: the nearest open-sea model cell, 23 km offshore. Height is significant wave height, the average of the highest third. Period is the peak period, and frequency is one over the period.

Weather

Fri, 16 Oct–High 17°, low 17°Wind up to 25 km/h · rain 0,0 mm
Sat, 17 OctRainHigh 17°, low 13°Wind up to 27 km/h · rain 7,5 mm
Sun, 18 OctCloudyHigh 14°, low 12°Wind up to 23 km/h · rain 0,9 mm

Sea temperature

101112131415161727 Aug28 Aug29 Aug30 Aug31 Aug01 Sept02 Sept03 Sept04 Sept05 Sept06 Sept07 Sept08 Sept09 Sept10 Sept11 Sept12 Sept13 Sept14 Sept15 Sept16 Sept17 Sept18 Sept19 Sept20 Sept21 Sept22 Sept23 Sept24 Sept25 Sept26 Sept27 Sept28 Sept29 Sept30 Sept01 Oct02 Oct03 Oct04 Oct05 Oct06 Oct07 Oct08 Oct09 Oct10 Oct11 Oct12 Oct13 Oct14 Oct15 Oct16 Oct17 Octnow

Line: OCIMS model at the surface, dashed ahead of now. Rings: NOAA satellite. Dots: Abagold seawater intake. Degrees Celsius.

15,6 °CAbagold seawater intake, New Harbour, HermanusMeasured 23:39 on 16 October, average of 3 sensors.
–OCIMS model, Hermanus point, 2,6 km awaynot available right now
15,4 °CNOAA CoralTemp satelliteFor 15 October. Satellite values run about two days behind.

The sources measure different things in different places and can differ by up to 2 °C, so the page shows the spread rather than picking one.

Sun and moon

DaySunriseSunsetMoonriseMoonset
Fri, 16 Oct06:0018:5709:27–
Sat, 17 Oct05:5818:5810:2100:45
Sun, 18 Oct05:5718:5911:1901:29
Mon, 19 Oct05:5619:0012:1902:07

Waxing crescent, 34% lit. Full moon Mon, 26 Oct at 06:12. New moon Mon, 09 Nov at 09:02.

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Sources
  • Tide predictions computed from TICON-4 harmonic constants for Simon's Town (CC BY 4.0).
  • Weather: data from MET Norway (CC BY 4.0).
  • Wave model: NOAA/NCEP WaveWatch III, served by PacIOOS (University of Hawaii).
  • Satellite sea temperature: NOAA Coral Reef Watch CoralTemp.
  • Sea temperature model and forecast: National OCIMS Fisheries and Aquaculture Decision Support Tool (DFFE/CSIR), used with permission.
  • Seawater intake readings: Abagold, New Harbour, Hermanus, used with permission.

Predictions are guidance, not for navigation. South Africa's official tide tables are the SA Navy Hydrographic Office's.