September Weather in Saint James, United States

Last updated: June 24, 2025

In September, the average temperature in Saint James, United States is a comfortable 26°C (80°F), with minimums dipping to 15°C (59°F) and maximums soaring to 35°C (96°F). Expect about 166 mm (6.5 in) of precipitation spread over 15 days, contributing to the region's average humidity of 79%. Perfect weather for enjoying the vibrant local culture!

September Temperature in Saint James

In September in Saint James, the average temperature is 26°C (80°F). Maximums can reach 35°C (96°F) and minimums can be as low as 15°C (59°F). This makes it an ideal time for travelers looking to enjoy warm weather while still having cooler evenings to relax.

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 26°C (80°F), with highs reaching up to 35°C (96°F) and lows dropping to around 15°C (59°F).

Data source: Temperature data for Saint James generated using information from the Copernicus Climate Change Service.

September Precipitation in Saint James

In Saint James in September, the total precipitation amount is 166 mm (6.5 in) spread across 15 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 166 mm (6.5 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Saint James

In Saint James in September, humidity is 79%. With an average temperature of 26°C (80°F), this humidity feels like an enveloping warm blanket, making travel feel slightly sluggish and prompting frequent hydration breaks to stay comfortable while exploring the sights.

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 79%, offering insight into how humid the weather typically is during this month.

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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more 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 10, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	92 mm (3.6 inches)	81%	moderate
February Weather	15°C (60°F)	108 mm (4.3 inches)	81%	very high
March Weather	18°C (65°F)	72 mm (2.8 inches)	79%	very high
April Weather	21°C (69°F)	115 mm (4.5 inches)	81%	extreme
May Weather	25°C (77°F)	140 mm (5.5 inches)	77%	extreme
June Weather	27°C (81°F)	210 mm (8.3 inches)	74%	extreme
July Weather	28°C (82°F)	214 mm (8.4 inches)	74%	extreme
August Weather	28°C (82°F)	223 mm (8.8 inches)	73%	extreme
September Weather	26°C (80°F)	166 mm (6.5 inches)	79%	very high
October Weather	23°C (73°F)	123 mm (4.8 inches)	77%	very high
November Weather	16°C (61°F)	65 mm (2.6 inches)	81%	high
December Weather	14°C (58°F)	101 mm (4.0 inches)	84%	moderate