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September Weather in Saint James, United States

Last updated: June 24, 2025

In Saint James, United States, the average temperature in September is a pleasant 21°C (71°F). However, temperatures can range from a cool 4°C (40°F) to a warm 35°C (95°F). Expect about 105 mm (4.1 in) of precipitation over 9 days, and enjoy an average humidity level of 68%.

September Temperature in Saint James

In September in Saint James, the average temperature is 21°C (71°F). Maximums can reach 35°C (95°F) and minimums can be as low as 4°C (40°F). Be prepared for a wide range of temperatures, making it ideal for layered clothing to enjoy your travel.

September Weather in Saint James: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint James, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint James, September typically has an average temperature of 21°C (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec353945556573797670604539
Data source: Temperature data for Saint James 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 Saint James

In Saint James in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

September Precipitation Trends in Saint James

The chart displays monthly precipitation patterns in Saint James, 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 Saint James, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec619488104132100127981051008494
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint James

In Saint James in September, humidity is 68%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, making traveling a bit sticky but also inviting for leisurely strolls and outdoor adventures.

September Average Humidity in Saint James

This chart illustrates the average monthly humidity levels in Saint James, 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 Saint James is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saint James

In Saint James 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 Saint James.

Maximum UV Index Levels in Saint James for September

The chart shows the monthly maximum UV Index (UVI) for Saint James 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 Saint James typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098743
Data source: Saint James 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 Saint James Compares to Other Months

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

This table compares monthly weather conditions in Saint James, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)61 mm (2.4 inches)86%moderate
February Weather4°C (39°F)94 mm (3.7 inches)86%moderate
March Weather7°C (45°F)88 mm (3.5 inches)86%high
April Weather13°C (55°F)104 mm (4.1 inches)84%very high
May Weather18°C (65°F)132 mm (5.2 inches)78%very high
June Weather23°C (74°F)100 mm (3.9 inches)79%very high
July Weather26°C (79°F)127 mm (5.0 inches)70%very high
August Weather25°C (77°F)98 mm (3.9 inches)59%very high
September Weather21°C (71°F)105 mm (4.1 inches)68%very high
October Weather16°C (60°F)100 mm (3.9 inches)80%high
November Weather7°C (45°F)84 mm (3.3 inches)86%moderate
December Weather4°C (39°F)94 mm (3.7 inches)85%moderate

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