September Weather in Los Alamos, United States

Last updated: June 24, 2025

The average temperature in Los Alamos, United States during September is a pleasant 19°C (67°F). With the mercury dipping as low as 9°C (49°F) and soaring to a maximum of 39°C (102°F), there's a wide range of temperatures to experience. Notably, you'll enjoy very little precipitation, with just 1 mm (0.0 in) falling over 0 days. Coupled with an average humidity of 70%, this month promises a comfortable climate to explore!

September Temperature in Los Alamos

In September in Los Alamos, the average temperature is 19°C (67°F), with maximums reaching up to 39°C (102°F) and minimums dropping as low as 9°C (49°F). This range of temperatures makes Los Alamos an ideal destination for travelers seeking a pleasant climate for outdoor activities.

September Weather in Los Alamos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Los Alamos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Los Alamos, September typically has an average temperature of 19°C (67°F), with highs reaching up to 39°C (102°F) and lows dropping to around 9°C (49°F).

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

September Precipitation in Los Alamos

In Los Alamos in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in Los Alamos

The chart displays monthly precipitation patterns in Los Alamos, 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 Los Alamos, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 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 Los Alamos

In Los Alamos in September humidity is 70%. With an average temperature of 19°C (67°F), this humidity feels like a warm blanket wrapping around you, making traveling somewhat uncomfortable and sticky, as the air feels dense and every movement requires a bit more effort.

September Average Humidity in Los Alamos

This chart illustrates the average monthly humidity levels in Los Alamos, 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 Los Alamos is approximately 70%, 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 Los Alamos

In Los Alamos 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 Los Alamos.

Maximum UV Index Levels in Los Alamos for September

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

Data source: Los Alamos 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 Los Alamos Compares to Other Months

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

This table compares monthly weather conditions in Los Alamos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	87 mm (3.4 inches)	80%	moderate
February Weather	12°C (53°F)	73 mm (2.9 inches)	83%	high
March Weather	12°C (55°F)	81 mm (3.2 inches)	80%	very high
April Weather	14°C (58°F)	21 mm (0.8 inches)	76%	very high
May Weather	15°C (60°F)	10 mm (0.4 inches)	75%	extreme
June Weather	18°C (65°F)	0 mm (0.0 inches)	74%	extreme
July Weather	20°C (68°F)	1 mm (0.0 inches)	75%	extreme
August Weather	20°C (68°F)	0 mm (0.0 inches)	72%	extreme
September Weather	19°C (67°F)	1 mm (0.0 inches)	70%	very high
October Weather	18°C (64°F)	8 mm (0.3 inches)	70%	high
November Weather	15°C (59°F)	26 mm (1.0 inches)	74%	moderate
December Weather	12°C (54°F)	65 mm (2.5 inches)	76%	moderate