September Weather in Deephaven, United States

Last updated: June 24, 2025

In Deephaven, United States, the average temperature in September hovers around 18°C (64°F), with a minimum dipping to 2°C (35°F) and a maximum reaching 33°C (91°F). Expect about 115 mm (4.5 in) of precipitation spread over 10 days, accompanied by an average humidity of 81%. Whether you’re exploring the outdoors or lounging indoors, be prepared for a diverse climate experience!

September Temperature in Deephaven

In September in Deephaven, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 2°C (35°F). It's advisable to pack layers to accommodate the warm days and cooler nights when traveling during this time.

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

The chart illustrates September temperature patterns in Deephaven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Deephaven, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (35°F).

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

September Precipitation in Deephaven

In Deephaven in September, the precipitation amount is 115 mm (4.5 in) over a span of 10 days.

September Precipitation Trends in Deephaven

The chart displays monthly precipitation patterns in Deephaven, 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 Deephaven, September typically receives around 115 mm (4.5 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 Deephaven

In Deephaven in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Deephaven

This chart illustrates the average monthly humidity levels in Deephaven, 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 Deephaven is approximately 81%, 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 Deephaven

In Deephaven 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 Deephaven.

Maximum UV Index Levels in Deephaven for September

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

Data source: Deephaven 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 Deephaven Compares to Other Months

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

This table compares monthly weather conditions in Deephaven, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	26 mm (1.0 inches)	87%	low
February Weather	-9°C (17°F)	31 mm (1.2 inches)	90%	moderate
March Weather	0°C (33°F)	56 mm (2.2 inches)	85%	moderate
April Weather	6°C (43°F)	86 mm (3.4 inches)	84%	high
May Weather	15°C (59°F)	120 mm (4.7 inches)	78%	very high
June Weather	22°C (72°F)	84 mm (3.3 inches)	80%	very high
July Weather	24°C (75°F)	101 mm (4.0 inches)	81%	very high
August Weather	22°C (71°F)	146 mm (5.7 inches)	81%	very high
September Weather	18°C (64°F)	115 mm (4.5 inches)	81%	high
October Weather	9°C (48°F)	97 mm (3.8 inches)	84%	moderate
November Weather	1°C (33°F)	34 mm (1.4 inches)	88%	moderate
December Weather	-5°C (23°F)	47 mm (1.9 inches)	84%	low