September Weather in Exeter, United States

Last updated: June 24, 2025

In Exeter, United States, the average temperature in September hovers around 23°C (73°F). Expect temperature fluctuations, with a minimum of 7°C (45°F) and a maximum reaching up to 34°C (93°F). This month also brings 56 mm (2.2 in) of precipitation, typically spread over 7 days, alongside an average humidity level of 64%. Enjoy the varied climate!

September Temperature in Exeter

In September in Exeter, the average temperature is 23°C (73°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 7°C (45°F). This range makes it an ideal time for travelers to enjoy outdoor activities while also being prepared for cooler evenings.

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

The chart illustrates September temperature patterns in Exeter, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Exeter, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Exeter

In Exeter in September, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.

September Precipitation Trends in Exeter

The chart displays monthly precipitation patterns in Exeter, 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 Exeter, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 7 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 Exeter

In Exeter in September, humidity is 64%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace, making travel quite comfortable yet slightly sticky, urging travelers to enjoy leisurely activities early in the day or seek shade during peak hours.

September Average Humidity in Exeter

This chart illustrates the average monthly humidity levels in Exeter, 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 Exeter is approximately 64%, 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 Exeter

In Exeter in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Exeter.

Maximum UV Index Levels in Exeter for September

The chart shows the monthly maximum UV Index (UVI) for Exeter 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 Exeter typically reaches 9, which falls under the very high exposure category.

Data source: Exeter 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 Exeter Compares to Other Months

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

This table compares monthly weather conditions in Exeter, 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 (36°F)	91 mm (3.6 inches)	81%	moderate
February Weather	4°C (39°F)	95 mm (3.7 inches)	78%	high
March Weather	10°C (50°F)	159 mm (6.3 inches)	76%	high
April Weather	13°C (56°F)	174 mm (6.8 inches)	78%	very high
May Weather	19°C (66°F)	172 mm (6.8 inches)	83%	very high
June Weather	24°C (76°F)	104 mm (4.1 inches)	83%	extreme
July Weather	26°C (79°F)	93 mm (3.7 inches)	78%	extreme
August Weather	25°C (77°F)	120 mm (4.7 inches)	68%	very high
September Weather	23°C (73°F)	56 mm (2.2 inches)	64%	very high
October Weather	15°C (59°F)	161 mm (6.3 inches)	70%	high
November Weather	8°C (47°F)	70 mm (2.7 inches)	83%	moderate
December Weather	6°C (42°F)	61 mm (2.4 inches)	87%	moderate