September Weather in O'Neill, United States

Last updated: June 24, 2025

In September, the average temperature in O'Neill, United States is a pleasant 19°C (67°F). Enjoy comfortable days, though be prepared for a minimum chill of 3°C (38°F) and potential highs reaching 35°C (96°F). With 65 mm (2.5 in) of precipitation spread over 7 days, you might want to have an umbrella handy. The average humidity sits at a warm 75%, adding to the tropical feel of the season.

September Temperature in O'Neill

In September in O'Neill, the average temperature is 19°C (67°F). Maximum temperatures can reach up to 35°C (96°F), while the minimum can drop as low as 3°C (38°F). Overall, it's a versatile month for travelers, offering pleasant warmth during the day and cooler evenings.

September Weather in O'Neill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in O'Neill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In O'Neill, September typically has an average temperature of 19°C (67°F), with highs reaching up to 35°C (96°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for O'Neill generated using information from the Copernicus Climate Change Service.

September Precipitation in O'Neill

In O'Neill in September, the precipitation amount is 65 mm (2.5 in) over a span of 7 days.

September Precipitation Trends in O'Neill

The chart displays monthly precipitation patterns in O'Neill, 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 O'Neill, September typically receives around 65 mm (2.5 inches) of precipitation spread over approximately 7 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in O'Neill

In O'Neill in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in O'Neill

This chart illustrates the average monthly humidity levels in O'Neill, 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 O'Neill is approximately 75%, 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 O'Neill

In O'Neill 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 O'Neill.

Maximum UV Index Levels in O'Neill for September

The chart shows the monthly maximum UV Index (UVI) for O'Neill 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 O'Neill typically reaches 8, which falls under the very high exposure category.

Data source: O'Neill 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 O'Neill Compares to Other Months

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

This table compares monthly weather conditions in O'Neill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	23 mm (0.9 inches)	77%	moderate
February Weather	-5°C (23°F)	24 mm (0.9 inches)	81%	moderate
March Weather	3°C (37°F)	73 mm (2.9 inches)	71%	high
April Weather	7°C (46°F)	62 mm (2.4 inches)	75%	very high
May Weather	15°C (59°F)	134 mm (5.3 inches)	74%	very high
June Weather	23°C (73°F)	87 mm (3.4 inches)	82%	very high
July Weather	24°C (76°F)	95 mm (3.7 inches)	84%	very high
August Weather	22°C (73°F)	89 mm (3.5 inches)	82%	very high
September Weather	19°C (67°F)	65 mm (2.5 inches)	75%	very high
October Weather	9°C (49°F)	72 mm (2.8 inches)	72%	high
November Weather	3°C (38°F)	24 mm (0.9 inches)	81%	moderate
December Weather	-2°C (29°F)	44 mm (1.7 inches)	79%	low