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September Weather in Los Alamos, United States

Last updated: June 24, 2025

In September, the average temperature in Los Alamos, United States hovers around 17°C (62°F). Expect a range where the minimum can dip to 1°C (34°F), while the mercury may soar up to 32°C (90°F). During this month, you can anticipate 51 mm (2.0 in) of precipitation spread over 7 days, contributing to an average humidity of 72%.

September Temperature in Los Alamos

In September, in Los Alamos, the average temperature is 17°C (62°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop to as low as 1°C (34°F). This makes Los Alamos an ideal destination for travelers seeking a range of experiences, from warm days to cool, refreshing nights.

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 17°C (62°F), with highs reaching up to 32°C (90°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec273040485767706762493930
Data source: Temperature data for Los Alamos generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Los Alamos

In Los Alamos in September, the precipitation amount is 51 mm (2.0 in) over a period of 7 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 51 mm (2.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec313139303032766651573224
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Los Alamos

In Los Alamos in September humidity is 72%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls but potentially heavy on the skin, prompting travelers to seek shade during midday excursions.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%66%60%57%55%57%65%72%78%81%79%
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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5810111213131211864
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)30 mm (1.2 inches)78%moderate
February Weather-1°C (30°F)31 mm (1.2 inches)79%very high
March Weather4°C (40°F)39 mm (1.5 inches)66%very high
April Weather9°C (49°F)30 mm (1.2 inches)60%extreme
May Weather14°C (58°F)30 mm (1.2 inches)57%extreme
June Weather20°C (67°F)32 mm (1.3 inches)55%extreme
July Weather21°C (70°F)76 mm (3.0 inches)56%extreme
August Weather20°C (68°F)65 mm (2.6 inches)65%extreme
September Weather17°C (62°F)51 mm (2.0 inches)72%extreme
October Weather10°C (50°F)57 mm (2.2 inches)78%very high
November Weather4°C (39°F)32 mm (1.3 inches)81%high
December Weather-1°C (30°F)23 mm (0.9 inches)79%moderate

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