September Weather in Winchester, United States

Last updated: June 24, 2025

In Winchester, United States, the average temperature in September hovers around 29°C (84°F). However, temperatures can vary significantly, with a minimum of 11°C (52°F) and soaring up to a sizzling 45°C (113°F). Rainfall is minimal, with just 2 mm (0.1 in) typically recorded over 0 days. The average humidity level remains comfortable at around 43%, making it a pleasant time to enjoy the local climate!

September Temperature in Winchester

In September, in Winchester, the average temperature is 29°C (84°F), with maximums reaching 45°C (113°F) and minimums dropping as low as 11°C (52°F). Be prepared for a wide range of temperatures and plan your activities accordingly when visiting.

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

The chart illustrates September temperature patterns in Winchester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Winchester, September typically has an average temperature of 29°C (84°F), with highs reaching up to 45°C (113°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Winchester

In Winchester in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Winchester

The chart displays monthly precipitation patterns in Winchester, 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 Winchester, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 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 Winchester

In Winchester in September humidity is 43%. With an average temperature of 29°C (84°F), this humidity feels like a warm embrace, making it comfortable for traveling as long as you stay hydrated and enjoy the occasional breeze.

September Average Humidity in Winchester

This chart illustrates the average monthly humidity levels in Winchester, 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 Winchester is approximately 43%, 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 Winchester

In Winchester in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Winchester.

Maximum UV Index Levels in Winchester for September

The chart shows the monthly maximum UV Index (UVI) for Winchester 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 Winchester typically reaches 10, which falls under the very high exposure category.

Data source: Winchester 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 Winchester Compares to Other Months

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

This table compares monthly weather conditions in Winchester, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	19 mm (0.8 inches)	81%	moderate
February Weather	11°C (52°F)	20 mm (0.8 inches)	84%	high
March Weather	15°C (60°F)	17 mm (0.7 inches)	76%	very high
April Weather	21°C (70°F)	3 mm (0.1 inches)	64%	very high
May Weather	25°C (76°F)	6 mm (0.2 inches)	48%	extreme
June Weather	32°C (89°F)	1 mm (0.0 inches)	40%	extreme
July Weather	34°C (94°F)	13 mm (0.5 inches)	33%	extreme
August Weather	34°C (93°F)	5 mm (0.2 inches)	29%	extreme
September Weather	29°C (84°F)	2 mm (0.1 inches)	43%	very high
October Weather	20°C (69°F)	3 mm (0.1 inches)	61%	high
November Weather	15°C (59°F)	13 mm (0.5 inches)	76%	moderate
December Weather	9°C (49°F)	13 mm (0.5 inches)	78%	moderate