September Weather in Rossiter, United States

Last updated: June 24, 2025

In September, the average temperature in Rossiter, United States is a comfortable 18°C (65°F). However, temperatures can swing between a chilly 2°C (35°F) and a warm 31°C (89°F). Expect some rain, with an average precipitation amount of 126 mm (5.0 in) over about 11 days. Additionally, the atmosphere tends to be quite humid, with an average humidity of 67%.

September Temperature in Rossiter

In September in Rossiter, the average temperature is 18°C (65°F). Maximums can reach 31°C (89°F), and minimums can be as low as 2°C (35°F). This range makes it a great time for travelers to enjoy a mix of warm and cool weather activities.

September Weather in Rossiter: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rossiter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rossiter, September typically has an average temperature of 18°C (65°F), with highs reaching up to 31°C (89°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in Rossiter

In Rossiter in September, the total precipitation amount is 126 mm (5.0 in) spread over 11 days.

September Precipitation Trends in Rossiter

The chart displays monthly precipitation patterns in Rossiter, 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 Rossiter, September typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 11 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 Rossiter

In Rossiter in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.

September Average Humidity in Rossiter

This chart illustrates the average monthly humidity levels in Rossiter, 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 Rossiter is approximately 67%, 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 Rossiter

In Rossiter 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 Rossiter.

Maximum UV Index Levels in Rossiter for September

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

Data source: Rossiter 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 Rossiter Compares to Other Months

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

This table compares monthly weather conditions in Rossiter, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (28°F)	98 mm (3.9 inches)	89%	moderate
February Weather	0°C (32°F)	123 mm (4.9 inches)	90%	moderate
March Weather	3°C (38°F)	105 mm (4.1 inches)	89%	high
April Weather	9°C (48°F)	134 mm (5.3 inches)	88%	very high
May Weather	15°C (59°F)	151 mm (6.0 inches)	80%	very high
June Weather	20°C (67°F)	133 mm (5.3 inches)	79%	very high
July Weather	22°C (72°F)	129 mm (5.1 inches)	74%	very high
August Weather	21°C (71°F)	101 mm (4.0 inches)	64%	very high
September Weather	18°C (65°F)	126 mm (5.0 inches)	67%	very high
October Weather	12°C (54°F)	122 mm (4.8 inches)	81%	high
November Weather	4°C (39°F)	98 mm (3.8 inches)	89%	moderate
December Weather	1°C (34°F)	107 mm (4.2 inches)	88%	low