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

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Weather in September

September witnesses a slight respite from the harsh conditions in Grytviken, giving a hint of spring, with a gradual rise in temperatures. Matching to this, the sea temperature also rises slightly from the absolute zero of the last two months. A corresponding dip in snowfall to 305mm (12.01") and a minor decrease in rainfall to 87mm (3.43") mirror the beginning of the city's gradual transition towards milder weather. Despite these subtle shifts in weather parameters, the wind speed prevails, peaking at an average of 25.7km/h (16mph), the highest for the year. This period also observes extended daylight hours, instilling hope of warmth in the frosty city.

Temperature

The advent of September in Grytviken, South Georgia and the South Sandwich Islands, observes an average high-temperature of a still subzero cold -0.4°C (31.3°F), nearly identical to August's -1.6°C (29.1°F). Throughout the nights in September, Grytviken notes an average low of -3.5°C (25.7°F), a small dip from the daytime peak.

Humidity

The average relative humidity in September in Grytviken, South Georgia and the South Sandwich Islands, is 89%.

Rainfall

In Grytviken, in September, it is raining for 9.3 days, with typically 87mm (3.43") of accumulated precipitation. Throughout the year, in Grytviken, South Georgia and the South Sandwich Islands, there are 168.8 rainfall days, and 1190mm (46.85") of precipitation is accumulated.

Snowfall

Months with snowfall are January through December. In Grytviken, in September, snow falls for 15.4 days, with typically accumulated 305mm (12.01") of snow. Throughout the year, there are 193 snowfall days, and 3130mm (123.23") of snow is accumulated.

Sea temperature

The months with the coldest seawater are August through October, with an average sea temperature of 0°C (32°F).
Note: In connection with swimming, this state is severely cold, hazardous, and lethal. Without protective insulated waterproof garments, hypothermia sets in rapidly.

Daylight

In Grytviken, the average length of the day in September is 11h and 42min.
On the first day of the month, sunrise is at 07:04 and sunset at 17:47. On the last day of September, in Grytviken, sunrise is at 05:52 and sunset at 18:39 -02.

Sunshine

In September, the average sunshine is 4h.

UV index

The months with the highest UV index in Grytviken are January through December, with an average maximum UV index of 1. January through December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 1 in September converts into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. 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. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is it in Grytviken in September?

September temperatures in Grytviken vary between a high-temperature of -0.4°C (31.3°F) and a low-temperature of -3.5°C (25.7°F).

What is the average humidity in September in Grytviken?

In September, the average relative humidity in Grytviken, South Georgia and the South Sandwich Islands, is 89%.

How much does it rain in Grytviken in September?

In Grytviken, in September, during 9.3 rainfall days, 87mm (3.43") of precipitation is typically accumulated.

How many days does it snow in September in Grytviken?

In September, in Grytviken, South Georgia and the South Sandwich Islands, it is snowing for 15.4 days. Throughout September, 305mm (12.01") of snow is accumulated.

When is the sea coldest in Grytviken?

August through October, with an average sea temperature of 0°C (32°F), are months with the coldest seawater in Grytviken, South Georgia and the South Sandwich Islands.

What is the water temperature in September in Grytviken?

In Grytviken, in September, the average water temperature 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.

What is the average length of the day in September in Grytviken?

In September, the average day length in Grytviken is 11h and 42min.

When is the sunrise / sunset in September in Grytviken?

On the first day of September in Grytviken, sunrise is at 07:04 and sunset at 17:47. On the last day of the month, sunrise is at 05:52 and sunset at 18:39 -02.

How many hours of sunshine does Grytviken have in September?

In Grytviken, South Georgia and the South Sandwich Islands, the average sunshine duration in September is 4h.

When is the highest UV index in Grytviken?

The months with the highest UV index in Grytviken, South Georgia and the South Sandwich Islands, are January through December, with an average maximum UV index of 1.

What is the month with the lowest UV index in Grytviken?

January through December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index reading in September in Grytviken?

In Grytviken, South Georgia and the South Sandwich Islands, the average daily maximum UV index in September is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Grytviken, South Georgia and the South Sandwich Islands

Average temperature in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average high temperature in September: -0.4°C

The warmest month (with the highest average high temperature) is February (3.1°C).
The month with the lowest average high temperature is August (-1.6°C).

  • Average low temperature in September: -3.5°C

The month with the highest average low temperature is February (1°C).
The coldest month (with the lowest average low temperature) is August (-4.9°C).

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Average pressure in September
Grytviken, South Georgia and the South Sandwich Islands

Average pressure in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average pressure in September: 1002.1mbar

The month with the highest atmospheric pressure is September (1002.1mbar).
The month with the lowest atmospheric pressure is December (992.9mbar).

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Average wind speed in September
Grytviken, South Georgia and the South Sandwich Islands

Average wind speed in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average wind speed in September: 25.7km/h

The windiest month (with the highest average wind speed) is September (25.7km/h).
The calmest month (with the lowest average wind speed) is December (23.5km/h).

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Average humidity in September
Grytviken, South Georgia and the South Sandwich Islands

Average humidity in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average humidity in September: 89%

The months with the highest relative humidity are January and February (91%).
The months with the lowest relative humidity are July and August (87%).

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Average rainfall in September
Grytviken, South Georgia and the South Sandwich Islands

Average rainfall in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall in September: 87mm

The wettest month (with the highest rainfall) is April (114mm).
The driest month (with the least rainfall) is October (82mm).

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Average rainfall days in September
Grytviken, South Georgia and the South Sandwich Islands

Average rainfall days in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average rainfall days in September: 9.3 days

The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (7.8 days).

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Average snowfall in September
Grytviken, South Georgia and the South Sandwich Islands

Average snowfall in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average snowfall in September: 305mm

The month with the highest snowfall is August (421mm).
The month with the least snowfall is March (125mm).

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Average snowfall days in September
Grytviken, South Georgia and the South Sandwich Islands

Average snowfall days in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average snowfall days in September: 15.4 days

The month with the highest number of snowfall days is August (19 days).
The month with the least snowfall days is February (11.7 days).

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Average sea temperature in September
Grytviken, South Georgia and the South Sandwich Islands

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

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

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Average daylight in September /
Average sunshine in September
Grytviken, South Georgia and the South Sandwich Islands

Average daylight in September / Average sunshine in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average daylight in September: 11h and 4min

The month with the longest days is December (Average daylight: 17h and 6min).
The month with the shortest days is June (Average daylight: 7h and 24min).

  • Average sunshine in September: 4h and 0min

The month with the most sunshine is October (Average sunshine: 5h and 48min).
The month with the least sunshine is August (Average sunshine: 3h and 0min).

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Average sunshine days in September
Grytviken, South Georgia and the South Sandwich Islands

Average sunshine days in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average sunshine days in September: 4 days

The months with the most sunshine days are September and November (4 days).
The month with the least sunshine days is January (1.1 days).

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Average UV index in September
Grytviken, South Georgia and the South Sandwich Islands

Average UV index in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average UV index in September: 1

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 1).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 1).

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Average cloud cover in September
Grytviken, South Georgia and the South Sandwich Islands

Average cloud cover in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average cloud cover in September: 69

The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is October (Cloud cover 66).

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Average visibility in September
Grytviken, South Georgia and the South Sandwich Islands

Average visibility in September - Grytviken, South Georgia and the South Sandwich Islands
  • Average visibility in September: 7km

The months with the highest visibility are January, February, March, April, May, June, October, November and December (8km).
The months with the lowest visibility are July, August and September (7km).

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Grytviken, South Georgia and the South Sandwich Islands

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