September Weather in Saint Stephen, United States

Last updated: June 24, 2025

In September, the average temperature in Saint Stephen, United States is a pleasant 25°C (77°F). While it can dip to a cool 12°C (53°F), temperatures can also soar to a scorching 35°C (96°F). Expect an average of 135 mm (5.3 in) of precipitation over 9 days, accompanied by a tropical humidity level of 83%. Embrace the diverse weather as you explore this dynamic destination!

September Temperature in Saint Stephen

In September in Saint Stephen, the average temperature is 25°C (77°F). Maximums can reach 35°C (96°F) and minimums can be as low as 12°C (53°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Saint Stephen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Stephen, September typically has an average temperature of 25°C (77°F), with highs reaching up to 35°C (96°F) and lows dropping to around 12°C (53°F).

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

September Precipitation in Saint Stephen

In Saint Stephen in September, the precipitation amount is 135 mm (5.3 in) spread over 9 days.

September Precipitation Trends in Saint Stephen

The chart displays monthly precipitation patterns in Saint Stephen, 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 Stephen, September typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 9 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 Stephen

In Saint Stephen in September humidity is 83%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket, making it essential for travelers to stay hydrated and seek shade to enjoy their adventures comfortably.

September Average Humidity in Saint Stephen

This chart illustrates the average monthly humidity levels in Saint Stephen, 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 Stephen is approximately 83%, 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 Stephen

In Saint Stephen 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 Stephen.

Maximum UV Index Levels in Saint Stephen for September

The chart shows the monthly maximum UV Index (UVI) for Saint Stephen 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 Stephen typically reaches 9, which falls under the very high exposure category.

Data source: Saint Stephen 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 Stephen Compares to Other Months

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

This table compares monthly weather conditions in Saint Stephen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	75 mm (2.9 inches)	86%	moderate
February Weather	13°C (55°F)	92 mm (3.6 inches)	81%	high
March Weather	15°C (59°F)	77 mm (3.0 inches)	81%	very high
April Weather	19°C (66°F)	96 mm (3.8 inches)	79%	very high
May Weather	23°C (74°F)	93 mm (3.6 inches)	75%	extreme
June Weather	26°C (79°F)	134 mm (5.3 inches)	75%	extreme
July Weather	27°C (82°F)	171 mm (6.7 inches)	80%	extreme
August Weather	27°C (81°F)	164 mm (6.5 inches)	81%	very high
September Weather	25°C (77°F)	135 mm (5.3 inches)	83%	very high
October Weather	21°C (70°F)	55 mm (2.1 inches)	78%	very high
November Weather	13°C (56°F)	70 mm (2.8 inches)	85%	high
December Weather	11°C (52°F)	144 mm (5.7 inches)	87%	moderate