September Weather in Lyndon, United States

Last updated: June 24, 2025

In September, the average temperature in Lyndon, United States hovers around 20°C (69°F). Be prepared for a temperature range that can dip to a cool 4°C (39°F) at night, or soar to a warm 34°C (94°F) during the day. Expect 112 mm (4.4 in) of precipitation spread across about 9 days, and enjoy the lush ambiance created by an average humidity of 78%.

September Temperature in Lyndon

In September in Lyndon, the average temperature is 20°C (69°F). Maximum temperatures can reach 34°C (94°F), while the minimum can drop to as low as 4°C (39°F). This range makes it an ideal time to explore outdoor activities while being prepared for some cooler evenings.

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

The chart illustrates September temperature patterns in Lyndon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lyndon, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Lyndon

In Lyndon in September, the total precipitation amount is 112 mm (4.4 in), occurring over a span of 9 days.

September Precipitation Trends in Lyndon

The chart displays monthly precipitation patterns in Lyndon, 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 Lyndon, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 9 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 Lyndon

In Lyndon in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Lyndon

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

In Lyndon 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 Lyndon.

Maximum UV Index Levels in Lyndon for September

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

Data source: Lyndon 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 Lyndon Compares to Other Months

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

This table compares monthly weather conditions in Lyndon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (24°F)	57 mm (2.3 inches)	81%	moderate
February Weather	-3°C (26°F)	57 mm (2.3 inches)	81%	moderate
March Weather	4°C (40°F)	88 mm (3.5 inches)	81%	high
April Weather	9°C (49°F)	106 mm (4.2 inches)	82%	very high
May Weather	17°C (62°F)	146 mm (5.7 inches)	78%	very high
June Weather	23°C (73°F)	145 mm (5.7 inches)	81%	very high
July Weather	25°C (76°F)	93 mm (3.7 inches)	79%	very high
August Weather	23°C (74°F)	78 mm (3.1 inches)	77%	very high
September Weather	20°C (69°F)	112 mm (4.4 inches)	78%	very high
October Weather	12°C (54°F)	113 mm (4.4 inches)	78%	high
November Weather	4°C (39°F)	50 mm (2.0 inches)	87%	moderate
December Weather	0°C (32°F)	49 mm (1.9 inches)	84%	low