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September Weather in Jamestown, United States

Last updated: June 24, 2025

In September, the average temperature in Jamestown, United States is a comfortable 23°C (73°F). Expect a range with a minimum around 6°C (43°F) and a peak of 36°C (97°F). During this month, you can anticipate about 137 mm (5.4 in) of precipitation spread over 10 days, contributing to an average humidity of 75%. Enjoy the mild climate, but be prepared for the occasional rain!

September Temperature in Jamestown

In September in Jamestown, the average temperature is 23°C (73°F). The maximum can reach 36°C (97°F), while the minimum can be as low as 6°C (43°F). Be prepared for warm days and cooler nights if you plan to travel during this time.

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

The chart illustrates September temperature patterns in Jamestown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jamestown, September typically has an average temperature of 23°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec414651606975807773634945
Data source: Temperature data for Jamestown 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 Jamestown

In Jamestown in September, the precipitation amount is 137 mm (5.4 in) over the course of 10 days.

September Precipitation Trends in Jamestown

The chart displays monthly precipitation patterns in Jamestown, 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 Jamestown, September typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec88121871091201069712713710482109
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jamestown

In Jamestown in September, humidity is 75%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel slightly uncomfortable yet invigorating as the air wraps around you, creating a sense of walking through a lush, tropical paradise.

September Average Humidity in Jamestown

This chart illustrates the average monthly humidity levels in Jamestown, 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 Jamestown is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jamestown

In Jamestown in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Jamestown.

Maximum UV Index Levels in Jamestown for September

The chart shows the monthly maximum UV Index (UVI) for Jamestown 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 Jamestown typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
Data source: Jamestown 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 Jamestown Compares to Other Months

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

This table compares monthly weather conditions in Jamestown, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)88 mm (3.5 inches)86%moderate
February Weather8°C (47°F)121 mm (4.8 inches)85%high
March Weather11°C (52°F)87 mm (3.4 inches)84%very high
April Weather16°C (60°F)109 mm (4.3 inches)82%very high
May Weather21°C (69°F)120 mm (4.7 inches)83%very high
June Weather24°C (76°F)106 mm (4.2 inches)82%extreme
July Weather27°C (80°F)97 mm (3.8 inches)80%very high
August Weather25°C (78°F)127 mm (5.0 inches)74%very high
September Weather23°C (73°F)137 mm (5.4 inches)75%very high
October Weather17°C (64°F)104 mm (4.1 inches)79%very high
November Weather9°C (49°F)82 mm (3.2 inches)87%moderate
December Weather7°C (45°F)109 mm (4.3 inches)87%moderate

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