Western Cape (Overberg)

Best Time for Hermanus

World's best land-based whale watching, Walker Bay clifftop walks

Monthly scores for 9 activities — derived from multi-year wind, rainfall, sea temperature, and wave averages. No opinion: every score is calculated from the data.

Hiking — Month by Month

Scored on: Dry trails, mild–warm temp, low wind

Best months: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec

Scale:ExcellentGoodFairPoorAvoid

Jan

5/5

Excellent

6.6d rain

Feb

4/5

Good

7.8d rain

Mar

4/5

Good

9d rain

Apr

5/5

Excellent

6d rain

May

4/5

Good

8.8d rain

Jun

4/5

Good

11d rain

Jul

4/5

Good

11.6d rain

Hols

Aug

4/5

Good

10.6d rain

Sep

4/5

Good

9d rain

Oct

4/5

Good

9d rain

Nov

4/5

Good

9.2d rain

Dec

4/5

Good

9.6d rain

Hols

Where to go

  • Fernkloof Nature Reserve (60+ km trails)
  • Walker Bay coastal path
  • Grotto Beach boardwalk

Best Months per Activity

Months scoring 4/5 or higher. Click a row to explore that activity.

Hiking

Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec

Camping

Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec

Beach & Swimming

Jan, Feb, Mar, Apr

Stand-Up Paddleboard

Jan, Feb, Apr

Kayaking

Jan, Feb, Mar, Apr, May, Jun, Sep, Oct, Nov, Dec

Scuba Diving

Jan, Feb, Mar, Apr, Oct, Nov, Dec

Snorkelling

Feb

Whale Watching

Aug, Sep, Oct, Nov

Fishing

Jan, Feb, Mar, Apr, May, Jun, Sep, Oct, Nov, Dec

Monthly Weather Averages

5-year averages 2020–2024 (ERA5); wave height 3-year average 2022–2024 (CMEMS)

Month High/Low (°C) Rain days Wind (km/h) Sea (°C) Wave (m) School
January24.8/17.56.625.620.62.4Term
February24.7/17.47.823.920.82.5Term
March23.3/16.2923.520.12.6Term
April20.8/13.5620.518.82.8Term
May19.1/11.58.819.117.93.2Term
June17.9/10.61120.5173.3Term
July15.9/8.611.621.316.33.7Winter break
August16.2/8.710.623.316.23.7Term
September17/9.9923.816.43.3Term
October20/12.7923.417.22.5Term
November21.5/14.29.22518.52.5Term
December22.8/15.99.625.719.82.6Summer break

How Scores Are Calculated

Each month receives a score of 1–5 per activity using fixed thresholds on the raw data. No editorial judgement — every score is derived directly from ERA5, NOAA ERSSTv5, and CMEMS figures.

Hiking:Dry trails, mild–warm temp, low wind
Camping:Dry nights, mild temperatures (frost/heat penalty)
Beach & Swimming:Warm air & sea, low wind, low rain
Stand-Up Paddleboard:Light wind <22 km/h, small waves, warm
Kayaking:Manageable wind & swell, dry, mild
Scuba Diving:Calm seas, warm water (visibility & comfort)
Snorkelling:Calm, clear, warm water
Whale Watching:Season: Jun–Nov (SR) / Jul–Nov (Humpback), calm sea
Fishing:Calm seas, manageable wind, cooler water

Data Sources & Attribution

Wind speed, rainfall & air temperature

ERA5 reanalysis (ECMWF) via Open-Meteo Archive API. Daily-max 10 m wind speed, total daily precipitation, and 2 m temperature, 2020–2024, averaged to monthly means. License: CC-BY 4.0.

open-meteo.com

Sea surface temperature

NOAA ERSSTv5 (Extended Reconstructed Sea Surface Temperature, version 5) accessed via NOAA CoastWatch ERDDAP. Monthly mean SST at nearest 1° grid cell, 2020–2024. NOAA NCEI public domain dataset.

coastwatch.pfeg.noaa.gov/erddap

Significant wave height

CMEMS (Copernicus Marine Service) via Open-Meteo Marine API. Daily-max significant wave height at nearest offshore grid point, 2022–2024 (3-year average; CMEMS model data available from 2022). License: CC-BY 4.0.

marine-api.open-meteo.com

Data last fetched: 2026-05-02

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