Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
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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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Grytviken in September?
What is the average humidity in September in Grytviken?
How much does it rain in Grytviken in September?
How many days does it snow in September in Grytviken?
When is the sea coldest in Grytviken?
What is the water temperature in September in Grytviken?
What is the average length of the day in September in Grytviken?
When is the sunrise / sunset in September in Grytviken?
How many hours of sunshine does Grytviken have in September?
When is the highest UV index in Grytviken?
What is the month with the lowest UV index in Grytviken?
What is the UV index reading in September in Grytviken?
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).
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).
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).
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%).
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).
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).
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).
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).
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).
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).
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).
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).
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).
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).
Grytviken, South Georgia and the South Sandwich Islands
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