September Weather in Delmar, United States

Last updated: June 24, 2025

In September, the average temperature in Delmar, United States is a pleasant 19°C (67°F). Visitors can expect temperatures to range from a cool 3°C (38°F) to a warm 33°C (92°F). With an average humidity of 78% and a total precipitation of 120 mm (4.7 in) over approximately 10 days, it's wise to prepare for occasional rain while enjoying the mild climate.

September Temperature in Delmar

In September in Delmar, the average temperature is 19°C (67°F). Maximum temperatures can reach 33°C (92°F), while minimums can dip as low as 3°C (38°F). It's a good idea to pack layers and be prepared for both warm days and chilly nights while traveling.

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

The chart illustrates September temperature patterns in Delmar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Delmar, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).

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

September Precipitation in Delmar

In Delmar in September, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 days.

September Precipitation Trends in Delmar

The chart displays monthly precipitation patterns in Delmar, 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 Delmar, September typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 10 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 Delmar

In Delmar in September humidity is 78%. With an average temperature of 19°C (67°F), this humidity feels like a warm, heavy blanket enveloping you, making traveling feel both sticky and sluggish as you navigate through the day.

September Average Humidity in Delmar

This chart illustrates the average monthly humidity levels in Delmar, 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 Delmar is approximately 78%, 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 Delmar

In Delmar 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 Delmar.

Maximum UV Index Levels in Delmar for September

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

Data source: Delmar 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 Delmar Compares to Other Months

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

This table compares monthly weather conditions in Delmar, 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 (22°F)	54 mm (2.1 inches)	81%	moderate
February Weather	-4°C (25°F)	58 mm (2.3 inches)	81%	moderate
March Weather	4°C (39°F)	77 mm (3.1 inches)	81%	high
April Weather	9°C (48°F)	96 mm (3.8 inches)	82%	very high
May Weather	16°C (61°F)	141 mm (5.6 inches)	78%	very high
June Weather	22°C (73°F)	122 mm (4.8 inches)	81%	very high
July Weather	24°C (76°F)	78 mm (3.1 inches)	79%	very high
August Weather	22°C (73°F)	92 mm (3.6 inches)	77%	very high
September Weather	19°C (67°F)	120 mm (4.7 inches)	78%	very high
October Weather	12°C (53°F)	113 mm (4.4 inches)	78%	high
November Weather	3°C (38°F)	48 mm (1.9 inches)	87%	moderate
December Weather	-1°C (31°F)	47 mm (1.8 inches)	84%	low