September Weather in Essex, United States

Last updated: June 24, 2025

The average temperature in Essex, United States during September is 21°C (70°F), with fluctuations ranging from a cool 5°C (42°F) to a warm 35°C (95°F). Expect about 104 mm (4.1 in) of precipitation across 10 days, while the average humidity sits at a comfortable 75%.

September Temperature in Essex

In September in Essex, the average temperature is 21°C (70°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 5°C (42°F). This diverse range in temperatures makes it essential to pack for both warm days and cooler evenings during your travels.

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

The chart illustrates September temperature patterns in Essex, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Essex, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 5°C (42°F).

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

September Precipitation in Essex

In Essex in September, the precipitation amount is 104 mm (4.1 in) over a period of 10 days.

September Precipitation Trends in Essex

The chart displays monthly precipitation patterns in Essex, 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 Essex, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 10 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 Essex

In Essex in September, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

September Average Humidity in Essex

This chart illustrates the average monthly humidity levels in Essex, 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 Essex 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 Essex

In Essex 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 Essex.

Maximum UV Index Levels in Essex for September

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

Data source: Essex 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 Essex Compares to Other Months

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

This table compares monthly weather conditions in Essex, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (26°F)	36 mm (1.4 inches)	76%	moderate
February Weather	-3°C (27°F)	32 mm (1.3 inches)	80%	moderate
March Weather	6°C (43°F)	93 mm (3.6 inches)	73%	high
April Weather	11°C (51°F)	72 mm (2.8 inches)	74%	very high
May Weather	18°C (64°F)	162 mm (6.4 inches)	78%	very high
June Weather	24°C (76°F)	130 mm (5.1 inches)	82%	extreme
July Weather	26°C (78°F)	93 mm (3.7 inches)	83%	very high
August Weather	24°C (75°F)	106 mm (4.2 inches)	80%	very high
September Weather	21°C (70°F)	104 mm (4.1 inches)	75%	very high
October Weather	12°C (54°F)	152 mm (6.0 inches)	75%	high
November Weather	5°C (41°F)	34 mm (1.4 inches)	82%	moderate
December Weather	0°C (33°F)	35 mm (1.4 inches)	83%	moderate