Grytviken
South Georgia and the South Sandwich Islands
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Grytviken, South Georgia and the South Sandwich Islands

September, the first month of the spring, in Grytviken, is still a cold month, with average temperature fluctuating between 3.5°C (38.3°F) and -3.3°C (26.1°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still wintry 3.5°C (38.3°F). In September, in Grytviken, the average low-temperature is -3.3°C (26.1°F).

Rainfall

In Grytviken, during September, the rain falls for 18 days and regularly aggregates up to 92mm (3.6") of precipitation. Throughout the year, in Grytviken, there are 205 rainfall days, and 1404mm (55.3") of precipitation is accumulated.

Sea temperature

August through October, with an average sea temperature of 0°C (32°F), are months with the coldest seawater. For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

Daylight

In September, the average length of the day is 11.7h.

Sunshine

In Grytviken, the average sunshine is 4.1h.

UV index

In Grytviken, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the UV radiation for ordinary individuals.
The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Grytviken?

In September, in Grytviken, South Georgia and the South Sandwich Islands, the average high-temperature is 3.5°C (38.3°F), and the average low-temperature is -3.3°C (26.1°F).

How much does it rain in Grytviken in September?

In Grytviken, in September, during 18 rainfall days, 92mm (3.6") of precipitation is typically accumulated.

What months are the sea coldest in Grytviken?

August through October, with an average sea temperature of 0°C (32°F), are months with the coldest seawater. For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the sea temperature in September in Grytviken?

In Grytviken, the average seawater temperature in September is 0°C (32°F). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

How many hours of daylight does Grytviken have in September?

In September, the average length of the day in Grytviken is 11.7h.

How long on average sun shines in September in Grytviken?

The average sunshine in September in Grytviken, South Georgia and the South Sandwich Islands, is 4.1h.

What is the UV index intensity in September in Grytviken?

The average daily maximum UV index in September in Grytviken, South Georgia and the South Sandwich Islands, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average high temperature in September: 3.5°C

The warmest month (with the highest average high temperature) is February (9.1°C).
The month with the lowest average high temperature is June (0.9°C).

  • Average low temperature in September: -3.3°C

The month with the highest average low temperature is February (1.7°C).
The coldest month (with the lowest average low temperature) is August (-4.9°C).

Average rainfall in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall in September: 92mm

Wettest months (with the highest rainfall) are July and August (149mm).
The driest month (with the lowest rainfall) is October (80mm).

Average rainfall days in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall days in September: 18 days

The month with the highest number of rainy days is April (19 days).
The month with the lowest number of rainy days is August (15 days).

Average sea temperature in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average sea temperature in September: 0°C

Best months for swimming (with the highest average sea temperature) are January, February, March and April (3°C).
Coldest months (with the lowest average sea temperature) are August, September and October (0°C).

Average daylight in September / Average sunshine in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average daylight in September: 11.7h

The month with the longest days is December (Average daylight: 17.1h).
The month with shortest days is June (Average daylight: 7.4h).

  • Average sunshine in September: 4.1h

The month with most sunshine is November (Average sunshine: 5.8h).
The month with least sunshine is June (Average sunshine: 0.4h).

Average UV index in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average UV index in September: 2

The month with the highest UV index is December (UV index 8).
Months with the lowest UV index are June and July (UV index 0).