September Weather in Exeter, United States

Last updated: June 24, 2025

In September, the average temperature in Exeter, United States hovers around 21°C (70°F). However, be prepared for a range of temperatures, with minimums dipping to 5°C (41°F) and maximums soaring to 36°C (97°F). Expect about 65 mm (2.6 in) of precipitation spread over 7 days, while the air maintains an average humidity of 77%.

September Temperature in Exeter

In September in Exeter, the average temperature is 21°C (70°F). Maximums can reach 36°C (97°F), and minimums can dip as low as 5°C (41°F). It's a great time to visit for those who enjoy mild weather with the possibility of warm days and cool 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 21°C (70°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°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 65 mm (2.6 in) over a span 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 65 mm (2.6 inches) of precipitation spread over approximately 7 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 Exeter

In Exeter in September, humidity is 77%. With an average temperature of 21°C (70°F), this humidity feels like a warm, slightly sticky embrace, making travel invigorating yet slightly uncomfortable as you navigate the vibrant streets and outdoor attractions.

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 77%, 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 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 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 8, 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	-3°C (27°F)	31 mm (1.2 inches)	73%	moderate
February Weather	-3°C (27°F)	23 mm (0.9 inches)	81%	moderate
March Weather	5°C (42°F)	90 mm (3.5 inches)	69%	high
April Weather	10°C (51°F)	47 mm (1.9 inches)	71%	very high
May Weather	17°C (63°F)	152 mm (6.0 inches)	80%	very high
June Weather	24°C (76°F)	102 mm (4.0 inches)	83%	extreme
July Weather	26°C (79°F)	55 mm (2.2 inches)	84%	very high
August Weather	24°C (75°F)	72 mm (2.9 inches)	84%	very high
September Weather	21°C (70°F)	65 mm (2.6 inches)	77%	very high
October Weather	11°C (53°F)	91 mm (3.6 inches)	72%	high
November Weather	5°C (41°F)	24 mm (0.9 inches)	80%	moderate
December Weather	0°C (33°F)	40 mm (1.6 inches)	79%	moderate