Weather and climate in Mossel Bay (South Africa)

The climate of Mossel Bay (Afrikaans: Mosselbaai) is subtropical oceanic, with very mild winters and warm summers. The rains are not abundant, but they are well distributed throughout the year.
The city is located on the southern coast of South Africa, on the small peninsula of St. Blaize. We are in the Western Cape province, and about 340 km (210 mi) east of Cape Town.
Even though the climate is mild, sometimes the wind from the interior can bring very hot days, more often in spring and autumn. In the worst moments the temperature can reach 38 °C (100 °F). In the evening, however, the temperature returns cool with the wind from the sea.
Even though the winter is mild, there can be some cold and windy days. On the coldest nights of the year, the temperature can drop to around freezing. At other times, the warm wind from the northern mountains can blow in this season as well, so much so that the temperature can reach 28 °C (82 °F) even in winter.

Mossel Bay - Climate data

The average temperature of the coldest month (August) is of 15.4 °C (59.7 °F), that of the warmest month (February) is of 21.5 °C (70.7 °F). Here are the average temperatures.
Precipitation amounts to 375 millimeters (14.8 inches) per year: it is therefore quite scarce. It ranges from 15 mm (0.6 in) in the driest month (May) to 55 mm (2.2 in) in the wettest one (November). Here is the average precipitation.
The sea temperature ranges from 17 °C (63 °F) in August to 22 °C (72 °F) in January, February. Here are the average sea temperatures.

Mossel Bay - Weather by month

Based on the period 1991-2020

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January is generally a warm month. The average temperature is of 21.4 °C (71 °F), with a minimum of 18 °C (64.5 °F) and a maximum of 24.8 °C (76.6 °F).
On the coldest nights of the month, the temperature usually drops to around 14.5 °C (58.5 °F).
On the warmest days of the month, the temperature usually reaches around 28 °C (82.5 °F). However, it reached 32.6 °C (90.7 °F) in January 2017.
Precipitation amounts to 30 mm (1.2 in), distributed over 6 days.
The day lasts on average 14 hours and 5 minutes. So the days are long.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 22 °C (71 °F). Therefore, the sea is cool for swimming.

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February, the warmest month of the year, is generally a warm month. The average temperature is of 21.5 °C (71 °F), with a minimum of 17.9 °C (64.2 °F) and a maximum of 25 °C (77.1 °F).
On the coldest nights of the month, the temperature usually drops to around 14 °C (57 °F).
On the warmest days of the month, the temperature usually reaches around 30.5 °C (86.5 °F). However, it reached 35.3 °C (95.5 °F) in February 2014.
Precipitation amounts to 25 mm (1 in), distributed over 6 days.
The day lasts on average 13 hours and 20 minutes.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 22 °C (71 °F). Therefore, the sea is cool for swimming.

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March is generally a warm month. The average temperature is of 20.6 °C (69 °F), with a minimum of 16.9 °C (62.5 °F) and a maximum of 24.2 °C (75.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 12.5 °C (54.5 °F).
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 29 °C (84.5 °F). However, it reached 35.2 °C (95.4 °F) in March 2010.
Precipitation amounts to 20 mm (0.8 in), distributed over 6 days.
The day lasts on average 12 hours and 10 minutes.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 21 °C (70 °F). Therefore, the sea is cool for swimming.

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April is generally a warm month. The average temperature is of 18.7 °C (66 °F), with a minimum of 14.5 °C (58.1 °F) and a maximum of 22.9 °C (73.3 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 10.5 °C (51 °F).
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 32 °C (89 °F).
Precipitation amounts to 25 mm (1 in), distributed over 7 days.
The day lasts on average 11 hours and 10 minutes.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 19.5 °C (67.5 °F). Therefore, the sea is very cool for swimming.

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May is generally a very mild month. The average temperature is of 17.8 °C (64 °F), with a minimum of 13.1 °C (55.5 °F) and a maximum of 22.6 °C (72.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 9 °C (48 °F).
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 31 °C (87.5 °F). However, it reached 37.1 °C (98.8 °F) in May 2013.
Precipitation amounts to 15 mm (0.6 in), distributed over 5 days.
The day lasts on average 10 hours and 20 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 11 kph (7 mph).
The average sea temperature is of 19 °C (66 °F). Therefore, the sea is very cool for swimming.

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June is generally a very mild month. The average temperature is of 16.1 °C (61 °F), with a minimum of 11.2 °C (52.2 °F) and a maximum of 21 °C (69.7 °F).
On the coldest nights, the temperature usually drops to around 7.5 °C (45.5 °F).
On the warmest days, the temperature usually reaches around 28 °C (82.5 °F). However, it reached 32 °C (89.6 °F) in June 2016.
Precipitation amounts to 30 mm (1.2 in), distributed over 5 days.
The day lasts on average 9 hours and 55 minutes. June 21, the winter solstice, is the shortest day of the year in the Southern Hemisphere.
The average humidity is 68%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

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July is generally a very mild month. The average temperature is of 15.7 °C (60 °F), with a minimum of 10.7 °C (51.3 °F) and a maximum of 20.7 °C (69.3 °F).
On the coldest nights of the month, the temperature usually drops to around 7 °C (44.5 °F).
On the warmest days of the month, the temperature usually reaches around 28 °C (82.5 °F). However, it reached 31.2 °C (88.2 °F) in July 2017.
Precipitation amounts to 40 mm (1.6 in), distributed over 6 days.
The day lasts on average 10 hours and 5 minutes.
The average humidity is 68%.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 17.5 °C (63 °F). Therefore, the sea is cold for swimming.

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August, the coldest month of the year, is generally a very mild month. The average temperature is of 15.4 °C (60 °F), with a minimum of 10.6 °C (51.1 °F) and a maximum of 20.1 °C (68.2 °F).
On the coldest nights of the month, the temperature usually drops to around 6.5 °C (44 °F).
On the warmest days of the month, the temperature usually reaches around 28.5 °C (83.5 °F). However, it reached 39 °C (102.2 °F) in August 2000.
Precipitation amounts to 40 mm (1.6 in), distributed over 6 days.
The day lasts on average 10 hours and 55 minutes.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is 13 kph (8 mph).
The average sea temperature is of 17 °C (63 °F). Therefore, the sea is cold for swimming.

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September is generally a very mild month. The average temperature is of 16.1 °C (61 °F), with a minimum of 11.8 °C (53.2 °F) and a maximum of 20.5 °C (68.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 8 °C (46.5 °F).
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 28.5 °C (83.5 °F). However, it reached 37.9 °C (100.2 °F) in September 2019.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 11 hours and 55 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 14 kph (8 mph).
The average sea temperature is of 17.5 °C (63.5 °F). Therefore, the sea is cold for swimming.

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October is generally a very mild month. The average temperature is of 17.3 °C (63 °F), with a minimum of 13.6 °C (56.4 °F) and a maximum of 21.1 °C (70 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 9.5 °C (48.5 °F).
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29 °C (84.5 °F). However, it reached 39 °C (102.2 °F) in October 2018.
Precipitation amounts to 40 mm (1.6 in), distributed over 8 days.
The day lasts on average 13 hours and 0 minutes.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

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November is generally a warm month. The average temperature is of 18.5 °C (65 °F), with a minimum of 14.8 °C (58.6 °F) and a maximum of 22.2 °C (71.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 11 °C (51.5 °F).
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 34.4 °C (93.9 °F) in November 2015.
Precipitation amounts to 55 mm (2.2 in), distributed over 7 days.
The day lasts on average 13 hours and 55 minutes.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 15 kph (9 mph).
The average sea temperature is of 19 °C (66.5 °F). Therefore, the sea is very cool for swimming.

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December is generally a warm month. The average temperature is of 20.3 °C (69 °F), with a minimum of 16.7 °C (62 °F) and a maximum of 23.9 °C (75 °F).
On the coldest nights of the month, the temperature usually drops to around 12 °C (53.5 °F).
On the warmest days of the month, the temperature usually reaches around 29 °C (84 °F). However, it reached 34.3 °C (93.7 °F) in December 2017.
Precipitation amounts to 20 mm (0.8 in), distributed over 6 days.
The day lasts on average 14 hours and 25 minutes. So the days are long. December 21, the summer solstice, is the longest day of the year in the Southern Hemisphere.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 14 kph (9 mph).
The average sea temperature is of 20.5 °C (69 °F). Therefore, the sea is cool for swimming.