September weather forecast
South Georgia and the South Sandwich Islands

September in South Georgia and the South Sandwich Islands marks the start of the spring season, with weather conditions beginning to moderate after the harsh winter. Average temperatures start to rise, albeit slowly, fluctuating between -3°C (26.6°F) and 4°C (39.2°F).

In Grytviken, similar patterns emerge, with temperatures slightly milder than the broader region due to the ocean's moderating influence. As such, the settlement experiences an earlier and more pronounced shift towards the milder conditions of spring.

Wind speeds start to decrease in September, averaging 25km/h (15.5mph). While storm events can still occur, their frequency and intensity reduce compared to the winter months, further signalling the arrival of spring.

Precipitation during September remains high, but the form it takes starts to change. The prevalence of snowfall begins to decrease, particularly in coastal regions like Grytviken, where rain becomes more common. However, in higher altitude areas, snowfall remains the primary form of precipitation, with potential for continued accumulation.

The advent of spring in September heralds the start of the return of wildlife to the islands. Migratory bird and marine species begin to reappear, drawn back by the moderating weather and the promise of the forthcoming summer bounty.

Compared to the cold, windy, and snowy conditions of August, September presents a shift towards milder temperatures, reduced wind speeds, and a transition from snow to rain. As the islands move into October, these signs of spring become even more pronounced, with further increases in temperatures, reduced windiness, and a continued transition from snowfall to rainfall.

---

• South Georgia Island - September »
  The start of September in South Georgia Island marks an average high-temperature of a still subzero cold -0.2°C (31.6°F), hardly distinguishable from the conditions in August. September brings a noticeable uptick in temperatures on South Georgia Island, painting a silver lining around the consistently lowering mercury levels.
• Grytviken - September »
  The advent of September in Grytviken 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). In September, in Grytviken it is snowing for 15.4 days.
• Stromness - September »
  In Stromness during September, the rain falls for 9.3 days and regularly aggregates up to 87mm (3.43") of precipitation. The average daily maximum UV index in September in Stromness, South Georgia and the South Sandwich Islands, is 1.