South Georgia and the South Sandwich Islands weather by month
Average temperatures and rainfall across South Georgia and the South Sandwich Islands, based on 30 years of climate data.
The average temperature in South Georgia and the South Sandwich Islands is around -1° across the year, though it swings month to month and from region to region. The figures below show the monthly pattern for Grytviken.
- Hottest
- Feb
- 3°
- Coldest
- Jul
- -5°
- Wettest
- Mar
- 139 mm
- Driest
- Nov
- 106 mm
- Annual avg
- -1°
- year-round
- Rain / yr
- 1414 mm
- 224 wet days
- Largest city
- Grytviken
- 0k people
- Cities
- 1
- with climate data
Monthly climate (Grytviken)
Average highs, lows and rainfall through the year for Grytviken, South Georgia and the South Sandwich Islands's largest city.
| Month | High / Low | Rainfall | Wet days |
|---|---|---|---|
| Jan | 3° / 0° | 120 mm | 19.5 |
| Feb | 3° / 1° | 115 mm | 18.1 |
| Mar | 3° / 0° | 139 mm | 20.3 |
| Apr | 1° / -1° | 131 mm | 19.2 |
| May | -0° / -3° | 119 mm | 19.2 |
| Jun | -2° / -5° | 115 mm | 17.8 |
| Jul | -2° / -5° | 118 mm | 18.4 |
| Aug | -2° / -5° | 121 mm | 18.9 |
| Sep | -1° / -4° | 113 mm | 17.2 |
| Oct | -0° / -3° | 109 mm | 18.5 |
| Nov | 1° / -2° | 106 mm | 17.5 |
| Dec | 2° / -1° | 108 mm | 19 |
Climate in Grytviken
Full Grytviken forecastGrytviken is the largest city in South Georgia and the South Sandwich Islands; its cloud cover, humidity, wind and sunshine are typical of the surrounding region.
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast through the year.
In Grytviken, the average share of the sky covered by clouds shows mild seasonal variation over the course of the year.
The clearer part of the year begins around March 14 and lasts for 2.6 months, ending around June 1. The clearest month is May, when the sky is clear, mostly clear, or partly cloudy 15% of the time on average.
The cloudier part of the year begins around January 21 and lasts for 1.7 months, ending around March 13. The cloudiest month is February, when it is overcast or mostly cloudy 90% of the time.
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Grytviken is typically light breeze, near 20 km/h, and varies little with the seasons.
The windier part of the year lasts 3.0 months, from around Jun 22 to Sep 19. The windiest month is August, averaging about 21 km/h (breezy).
The calmer part of the year runs from around Nov 13 to Feb 13, with December the calmest month at about 18 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 18 | 19 | 20 | 20 | 19 | 19 | 20 | 21 | 20 | 20 | 19 | 18 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | breezy | breezy | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 18 | light breeze |
| Feb | 19 | light breeze |
| Mar | 20 | light breeze |
| Apr | 20 | light breeze |
| May | 19 | light breeze |
| Jun | 19 | light breeze |
| Jul | 20 | breezy |
| Aug | 21 | breezy |
| Sep | 20 | light breeze |
| Oct | 20 | light breeze |
| Nov | 19 | light breeze |
| Dec | 18 | light breeze |
Best time to visit South Georgia and the South Sandwich Islands
A 0–10 score combining daytime comfort, chance of rain and cloud cover.
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Grytviken receives about 3.3 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 0.6 and 6.7 kWh/m².
The brighter stretch of the year lasts 5.6 months, from around Sep 25 to Mar 13. The brightest month is December, averaging about 6.6 kWh/m² (intense).
The dimmest month is June, down near 0.6 kWh/m² — roughly 91% less than the December peak.
Where is South Georgia and the South Sandwich Islands?
South Georgia and the South Sandwich Islands sits around 54.3°S, 36.5°W. The marker shows Grytviken, its largest city, among 1 city with climate data here.
