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September Weather in Saint James, United States

Last updated: June 24, 2025

In September, the average temperature in Saint James, United States is a pleasant 25°C (78°F). You can expect a minimum of 14°C (58°F) and a maximum of 32°C (89°F), making it a comfortable month for outdoor activities. However, be prepared for some rain, as the area typically receives 212 mm (8.4 in) of precipitation over 12 days. With an average humidity of 81%, the atmosphere can feel quite tropical.

September Temperature in Saint James

In September in Saint James, the average temperature is 25°C (78°F), with maximums reaching 32°C (89°F) and minimums dropping as low as 14°C (58°F). This pleasant climate makes Saint James an inviting destination for travelers seeking a comfortable getaway.

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 25°C (78°F), with highs reaching up to 32°C (89°F) and lows dropping to around 14°C (58°F).
JanFebMarAprMayJunJulAugSepOctNovDec505457647277818077715954
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 precipitation amount is 212 mm (8.4 in) occurring over 12 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 212 mm (8.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec70108759510713816420421267104132
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 81%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities less comfortable and requiring frequent breaks to stay hydrated.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%80%79%78%78%78%82%81%81%78%82%84%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
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 Weather10°C (50°F)70 mm (2.8 inches)83%moderate
February Weather12°C (54°F)108 mm (4.3 inches)79%high
March Weather14°C (57°F)75 mm (2.9 inches)79%very high
April Weather18°C (64°F)95 mm (3.7 inches)78%very high
May Weather22°C (72°F)107 mm (4.2 inches)78%extreme
June Weather25°C (78°F)138 mm (5.4 inches)78%extreme
July Weather27°C (81°F)163 mm (6.4 inches)82%extreme
August Weather27°C (80°F)204 mm (8.0 inches)81%extreme
September Weather25°C (78°F)212 mm (8.4 inches)81%very high
October Weather22°C (71°F)67 mm (2.6 inches)78%very high
November Weather15°C (59°F)104 mm (4.1 inches)82%high
December Weather12°C (54°F)132 mm (5.2 inches)84%moderate

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