September Weather in Saint Helen, United States

Last updated: June 24, 2025

In Saint Helen, United States, the month of September brings an average temperature of 16°C (61°F), with a minimum dipping to -1°C (31°F) and a maximum soaring up to 34°C (93°F). Expect precipitation of around 76 mm (3.0 in) over about 10 days, while the average humidity sits at a comfortable 79%. Enjoy the diverse climate as you explore this unique destination!

September Temperature in Saint Helen

In September in Saint Helen, the average temperature is 16°C (61°F). Maximums can reach 34°C (93°F), while minimums can dip as low as -1°C (31°F). Be prepared for a range of temperatures when traveling to Saint Helen this time of year.

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

The chart illustrates September temperature patterns in Saint Helen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Helen, September typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (93°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Saint Helen

In Saint Helen in September, the total precipitation amount is 76 mm (3.0 in) spread over a period of 10 days.

September Precipitation Trends in Saint Helen

The chart displays monthly precipitation patterns in Saint Helen, 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 Helen, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 10 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 Helen

In Saint Helen in September humidity is 79%. With an average temperature of 16°C (61°F), this humidity feels like a warm, moist embrace, making travel a bit more challenging as the air tends to weigh heavily, but it also offers a refreshing atmosphere perfect for exploring local sights and enjoying nature.

September Average Humidity in Saint Helen

This chart illustrates the average monthly humidity levels in Saint Helen, 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 Helen 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 Helen

In Saint Helen in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Saint Helen.

Maximum UV Index Levels in Saint Helen for September

The chart shows the monthly maximum UV Index (UVI) for Saint Helen 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 Helen typically reaches 7, which falls under the high exposure category.

Data source: Saint Helen 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 Helen Compares to Other Months

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

This table compares monthly weather conditions in Saint Helen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (22°F)	51 mm (2.0 inches)	92%	low
February Weather	-6°C (22°F)	51 mm (2.0 inches)	91%	moderate
March Weather	0°C (32°F)	54 mm (2.1 inches)	87%	moderate
April Weather	6°C (43°F)	94 mm (3.7 inches)	85%	very high
May Weather	13°C (56°F)	111 mm (4.4 inches)	79%	very high
June Weather	19°C (66°F)	114 mm (4.5 inches)	75%	very high
July Weather	22°C (72°F)	91 mm (3.6 inches)	75%	very high
August Weather	20°C (69°F)	89 mm (3.5 inches)	75%	very high
September Weather	16°C (61°F)	76 mm (3.0 inches)	79%	high
October Weather	10°C (49°F)	124 mm (4.9 inches)	85%	moderate
November Weather	2°C (35°F)	58 mm (2.3 inches)	88%	moderate
December Weather	-2°C (28°F)	62 mm (2.4 inches)	89%	low