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September Weather in Georgetown, United States

Last updated: June 24, 2025

In Georgetown, United States, the average temperature in September hovers around 16°C (62°F), offering a pleasant backdrop for your adventures. Expect temperatures to range from a chilly 0°C (32°F) to a warm 31°C (89°F). Be prepared for some precipitation, as the area typically receives around 99 mm (3.9 in) over approximately 10 days. With an average humidity of 78%, it’s a great time to enjoy the lush surroundings while staying comfortable!

September Temperature in Georgetown

In September in Georgetown, the average temperature is 16°C (62°F). The maximum can reach 31°C (89°F), while the minimum can drop as low as 0°C (32°F). Be prepared for a wide range of temperatures when traveling during this month.

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 16°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec232632445665706862523729
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 total precipitation amount is 99 mm (3.9 in) spread over a period 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 99 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec941019612313612118114099167110105
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 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34691010998642
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 Weather-5°C (24°F)94 mm (3.7 inches)90%moderate
February Weather-3°C (26°F)101 mm (4.0 inches)90%moderate
March Weather0°C (33°F)96 mm (3.8 inches)87%high
April Weather7°C (44°F)123 mm (4.8 inches)88%very high
May Weather14°C (57°F)136 mm (5.3 inches)82%very high
June Weather18°C (65°F)121 mm (4.8 inches)79%very high
July Weather21°C (70°F)180 mm (7.1 inches)78%very high
August Weather20°C (68°F)140 mm (5.5 inches)76%very high
September Weather16°C (62°F)99 mm (3.9 inches)78%very high
October Weather11°C (52°F)167 mm (6.6 inches)84%high
November Weather3°C (37°F)110 mm (4.3 inches)89%moderate
December Weather-2°C (29°F)105 mm (4.1 inches)86%low

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