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September Weather in Jamestown, United States

Last updated: June 24, 2025

In Jamestown, United States, the average temperature in September is a pleasant 22°C (72°F). However, be prepared for a range, with minimums dipping to 7°C (45°F) and maximums soaring up to 40°C (105°F). During this time, you can expect 4 mm (0.2 in) of precipitation spread over just 1 day, and the average humidity hovers around 55%.

September Temperature in Jamestown

In September in Jamestown, the average temperature is 22°C (72°F), with maximums reaching up to 40°C (105°F) and minimums dipping as low as 7°C (45°F). This makes Jamestown a great destination for travelers seeking warm weather, but it’s advisable to prepare for possible temperature swings.

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 22°C (72°F), with highs reaching up to 40°C (105°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec464751576372787772625246
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 4 mm (0.2 in) during 1 day.

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 4 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec183180197834940144489148
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 55%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, creating a pleasant and comfortable environment for traveling and exploring the area's attractions.

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 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109743
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 Weather8°C (46°F)183 mm (7.2 inches)82%moderate
February Weather8°C (47°F)180 mm (7.1 inches)84%moderate
March Weather10°C (51°F)197 mm (7.7 inches)82%very high
April Weather14°C (57°F)83 mm (3.3 inches)78%very high
May Weather17°C (63°F)49 mm (1.9 inches)71%extreme
June Weather22°C (73°F)4 mm (0.1 inches)64%extreme
July Weather26°C (79°F)0 mm (0.0 inches)58%extreme
August Weather25°C (78°F)0 mm (0.0 inches)54%very high
September Weather22°C (72°F)4 mm (0.2 inches)55%very high
October Weather16°C (62°F)44 mm (1.7 inches)62%high
November Weather11°C (52°F)89 mm (3.5 inches)78%moderate
December Weather8°C (46°F)148 mm (5.8 inches)80%moderate

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