September Weather in Prospect, United States

Last updated: June 24, 2025

In September, the average temperature in Prospect, United States hovers around 20°C (68°F). Expect a range from a cool 5°C (41°F) to a sizzling 34°C (94°F), making for quite the temperature swing! During this month, you can anticipate about 78 mm (3.1 in) of precipitation spread over 8 days, contributing to an average humidity level of 78%. Stay prepared for a mix of weather!

September Temperature in Prospect

In September in Prospect, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (94°F) and minimums can drop as low as 5°C (41°F). This varied climate makes it a great time for travelers to experience both warm days and cooler evenings, perfect for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Prospect, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Prospect, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Prospect

In Prospect in September, the total precipitation amount is 78 mm (3.1 in) over the course of 8 days.

September Precipitation Trends in Prospect

The chart displays monthly precipitation patterns in Prospect, 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 Prospect, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 8 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 Prospect

In Prospect in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Prospect

This chart illustrates the average monthly humidity levels in Prospect, 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 Prospect is approximately 78%, 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 Prospect

In Prospect 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 Prospect.

Maximum UV Index Levels in Prospect for September

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

Data source: Prospect 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 Prospect Compares to Other Months

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

This table compares monthly weather conditions in Prospect, 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 (30°F)	72 mm (2.8 inches)	88%	moderate
February Weather	0°C (33°F)	97 mm (3.8 inches)	87%	moderate
March Weather	5°C (41°F)	97 mm (3.8 inches)	87%	high
April Weather	10°C (51°F)	112 mm (4.4 inches)	87%	very high
May Weather	17°C (63°F)	125 mm (4.9 inches)	81%	very high
June Weather	22°C (72°F)	135 mm (5.3 inches)	82%	very high
July Weather	24°C (75°F)	112 mm (4.4 inches)	81%	very high
August Weather	23°C (73°F)	81 mm (3.2 inches)	78%	very high
September Weather	20°C (68°F)	78 mm (3.1 inches)	78%	very high
October Weather	14°C (57°F)	96 mm (3.8 inches)	82%	high
November Weather	5°C (42°F)	92 mm (3.6 inches)	89%	moderate
December Weather	2°C (35°F)	83 mm (3.3 inches)	86%	moderate