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September Weather in Georgetown, Saint Helena, Ascension and Tristan da Cunha

Last updated: August 31, 2025

In September, the average temperature in Georgetown, Saint Helena, Ascension and Tristan da Cunha is a pleasant 24°C (75°F). Expect minimums of 22°C (73°F) and maximums of 25°C (77°F), creating an ideal climate for outdoor activities. With an average precipitation of 19 mm (0.7 in) over 3 days and a humidity level around 80%, it's a good idea to carry an umbrella while enjoying the warm weather!

September Temperature in Georgetown

In September in Georgetown, the average temperature is 24°C (75°F), with maximums reaching up to 25°C (77°F) and minimums dipping as low as 22°C (73°F). This pleasant climate makes Georgetown an ideal destination for travelers seeking comfortable weather.

September Weather in Georgetown: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Georgetown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Georgetown, September typically has an average temperature of 24°C (75°F), with highs reaching up to 25°C (77°F) and lows dropping to around 22°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec777980808078767574757576
Data source: Temperature data for Georgetown generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Georgetown

In Georgetown in September, the precipitation amount is 19 mm (0.7 in) over a period of 3 days.

September Precipitation Trends in Georgetown

The chart displays monthly precipitation patterns in Georgetown, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Georgetown, September typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec91516211414171919151112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Georgetown

In Georgetown in September humidity is 80%. With an average temperature of 24°C (75°F), this humidity feels like a warm, sticky blanket enveloping you, making travel slightly uncomfortable as sweat clings to your skin and the air feels thick, urging you to seek shade and hydration frequently.

September Average Humidity in Georgetown

This chart illustrates the average monthly humidity levels in Georgetown, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Georgetown is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%79%80%85%81%79%79%80%80%80%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Georgetown

In Georgetown in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Georgetown.

Maximum UV Index Levels in Georgetown for September

The chart shows the monthly maximum UV Index (UVI) for Georgetown in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Georgetown typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141414131210101112131414
Data source: Georgetown September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Georgetown Compares to Other Months

Weather in Georgetown varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Georgetown, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Georgetown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)9 mm (0.3 inches)82%extreme
February Weather26°C (79°F)15 mm (0.6 inches)80%extreme
March Weather27°C (80°F)16 mm (0.6 inches)79%extreme
April Weather27°C (81°F)21 mm (0.8 inches)80%extreme
May Weather26°C (80°F)14 mm (0.6 inches)85%extreme
June Weather26°C (78°F)14 mm (0.6 inches)81%very high
July Weather25°C (77°F)17 mm (0.7 inches)79%very high
August Weather24°C (75°F)19 mm (0.8 inches)79%extreme
September Weather24°C (75°F)19 mm (0.7 inches)80%extreme
October Weather24°C (75°F)15 mm (0.6 inches)80%extreme
November Weather24°C (76°F)11 mm (0.4 inches)80%extreme
December Weather24°C (76°F)12 mm (0.5 inches)80%extreme

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