September Weather in Orange, United States

Last updated: June 24, 2025

In Orange, United States, the average temperature in September hovers around 18°C (65°F), with a minimum drop to 2°C (35°F) and a maximum reach of 33°C (91°F). Expect about 85 mm (3.4 in) of precipitation spread over 8 days, contributing to an average humidity of 71%. Whether you prefer the refreshing coolness or the warmth of sunny days, September has a little something for everyone!

September Temperature in Orange

In September in Orange, the average temperature is 18°C (65°F). The maximum can reach 33°C (91°F), while the minimum can be as low as 2°C (35°F). Pack accordingly for a varied climate to fully enjoy your trip to Orange.

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

The chart illustrates September temperature patterns in Orange, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Orange, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in Orange

In Orange in September, the precipitation amount is 85 mm (3.4 in) over the course of 8 days.

September Precipitation Trends in Orange

The chart displays monthly precipitation patterns in Orange, 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 Orange, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 8 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 Orange

In Orange in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

September Average Humidity in Orange

This chart illustrates the average monthly humidity levels in Orange, 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 Orange is approximately 71%, 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 Orange

In Orange 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 Orange.

Maximum UV Index Levels in Orange for September

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

Data source: Orange 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 Orange Compares to Other Months

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

This table compares monthly weather conditions in Orange, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	75 mm (3.0 inches)	86%	moderate
February Weather	-1°C (30°F)	89 mm (3.5 inches)	84%	moderate
March Weather	2°C (35°F)	83 mm (3.3 inches)	82%	high
April Weather	8°C (46°F)	126 mm (5.0 inches)	80%	very high
May Weather	14°C (58°F)	90 mm (3.6 inches)	72%	very high
June Weather	20°C (68°F)	78 mm (3.1 inches)	72%	very high
July Weather	23°C (73°F)	135 mm (5.3 inches)	67%	very high
August Weather	22°C (72°F)	80 mm (3.1 inches)	66%	very high
September Weather	18°C (65°F)	85 mm (3.4 inches)	71%	very high
October Weather	12°C (54°F)	133 mm (5.2 inches)	78%	high
November Weather	4°C (40°F)	98 mm (3.9 inches)	84%	moderate
December Weather	-1°C (31°F)	123 mm (4.8 inches)	81%	low