September Weather in Bourne, United States

Last updated: June 24, 2025

In September, the average temperature in Bourne, United States hovers around 19°C (67°F), creating a comfortable atmosphere for exploration. However, be prepared for a minimum of 11°C (53°F) and a maximum of 28°C (82°F), so layering your wardrobe is wise. With precipitation amounts reaching 108 mm (4.2 in) over 10 days and an average humidity of 75%, it's a great time to embrace the local scenery and enjoy the lush environments that come with the season.

September Temperature in Bourne

In September in Bourne, the average temperature is 19°C (67°F), with maximums reaching 28°C (82°F) and minimums dipping down to 11°C (53°F). It’s a pleasant time to visit, perfect for outdoor activities and exploring the sights.

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

The chart illustrates September temperature patterns in Bourne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bourne, September typically has an average temperature of 19°C (67°F), with highs reaching up to 28°C (82°F) and lows dropping to around 11°C (53°F).

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

September Precipitation in Bourne

In Bourne in September, the precipitation amount is 108 mm (4.2 in) distributed over a duration of 10 days.

September Precipitation Trends in Bourne

The chart displays monthly precipitation patterns in Bourne, 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 Bourne, September typically receives around 108 mm (4.2 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 Bourne

In Bourne in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Bourne

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

In Bourne 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 Bourne.

Maximum UV Index Levels in Bourne for September

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

Data source: Bourne 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 Bourne Compares to Other Months

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

This table compares monthly weather conditions in Bourne, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (35°F)	86 mm (3.4 inches)	84%	moderate
February Weather	2°C (36°F)	103 mm (4.1 inches)	84%	moderate
March Weather	4°C (39°F)	112 mm (4.4 inches)	82%	high
April Weather	8°C (47°F)	125 mm (4.9 inches)	79%	very high
May Weather	13°C (56°F)	102 mm (4.0 inches)	75%	very high
June Weather	19°C (66°F)	87 mm (3.4 inches)	78%	very high
July Weather	23°C (73°F)	91 mm (3.6 inches)	76%	very high
August Weather	23°C (73°F)	78 mm (3.1 inches)	76%	very high
September Weather	19°C (67°F)	108 mm (4.2 inches)	75%	very high
October Weather	15°C (59°F)	151 mm (5.9 inches)	75%	high
November Weather	8°C (47°F)	93 mm (3.7 inches)	80%	moderate
December Weather	4°C (39°F)	121 mm (4.8 inches)	80%	low