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September Weather in Georgetown, United States

Last updated: June 24, 2025

In September, the average temperature in Georgetown, United States hovers around 26°C (79°F). Experience the wide range of temperatures, with a minimum of 13°C (55°F) and a maximum reaching up to 37°C (98°F). Be prepared for 106 mm (4.2 in) of precipitation over approximately 10 days, alongside a high average humidity of 79%, creating a tropical atmosphere that’s both lush and vibrant.

September Temperature in Georgetown

In September in Georgetown, the average temperature is 26°C (79°F). The maximum can reach 37°C (98°F), while the minimum can drop to as low as 13°C (55°F). This range of temperatures makes Georgetown a great destination for travelers seeking warm weather with pleasant nighttime cooling.

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 26°C (79°F), with highs reaching up to 37°C (98°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec505661667479828178705753
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 106 mm (4.2 in) over a span of 10 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 106 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec104108911169910210911410611158129
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 79%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace that can make outdoor activities feel exhausting. Travelers should be prepared for a heavy air that clings to the skin, making hydration essential while navigating the sights and sounds of the city.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%79%77%74%70%78%78%79%74%83%86%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
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 Weather10°C (50°F)104 mm (4.1 inches)83%moderate
February Weather14°C (57°F)108 mm (4.3 inches)82%high
March Weather16°C (61°F)91 mm (3.6 inches)79%very high
April Weather19°C (66°F)116 mm (4.6 inches)77%very high
May Weather24°C (75°F)99 mm (3.9 inches)74%extreme
June Weather26°C (79°F)102 mm (4.0 inches)70%extreme
July Weather28°C (82°F)109 mm (4.3 inches)78%extreme
August Weather27°C (81°F)114 mm (4.5 inches)78%extreme
September Weather26°C (79°F)106 mm (4.2 inches)79%very high
October Weather21°C (71°F)111 mm (4.4 inches)74%very high
November Weather14°C (57°F)58 mm (2.3 inches)83%high
December Weather11°C (53°F)129 mm (5.1 inches)86%moderate

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