September weather forecast and climate
Los Alamos, NM

Weather in September

September, the first month of the autumn, in Los Alamos, is still a warm month, with average temperature varying between 51.6°F (10.9°C) and 73.9°F (23.3°C).

Temperature

In Los Alamos, New Mexico, the average high-temperature slightly decreases, from 79.7°F (26.5°C) in August, to a still warm 73.9°F (23.3°C). In September, the average low-temperature is 51.6°F (10.9°C).

Humidity

In Los Alamos, the average relative humidity in September is 49%.

Rainfall

In Los Alamos, it is raining for 11.7 days, with typically 1.22" (31mm) of accumulated precipitation. Throughout the year, there are 106.2 rainfall days, and 12.05" (306mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

The average length of the day is 12.4h.

Sunshine

In September, the average sunshine is 11.4h.

UV index

In Los Alamos, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Los Alamos?

In September, in Los Alamos, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 51.6°F (10.9°C).

What is the average humidity in September in Los Alamos?

In September, the average relative humidity in Los Alamos is 49%.

How much does it rain in Los Alamos in September?

In Los Alamos, New Mexico, during September, the rain falls for 11.7 days and regularly aggregates up to 1.22" (31mm) of precipitation.

Does it snow in Los Alamos in September?

In Los Alamos, New Mexico, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Los Alamos?

In Los Alamos, New Mexico, snow does not fall in June through September.

How many hours of daylight does Los Alamos have in September?

The average length of the day in September in Los Alamos is 12.4h.

How long on average sun shines in September in Los Alamos?

In September, the average sunshine is 11.4h.

What is the UV index intensity in September in Los Alamos?

In Los Alamos, New Mexico, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Los Alamos, NM

Average temperature in September - Los Alamos, NM
  • Average high temperature in September: 73.9°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 51.6°F

The month with the highest average low temperature is July (59.2°F).
The coldest months (with the lowest average low temperature) are January and December (21.6°F).

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Average pressure in September
Los Alamos, NM

Average pressure in September - Los Alamos, NM
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is April (29.89").

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Average wind speed in September
Los Alamos, NM

Average wind speed in September - Los Alamos, NM
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in September
Los Alamos, NM

Average humidity in September - Los Alamos, NM
  • Average humidity in September: 49%

The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is June (33%).

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Average rainfall in September
Los Alamos, NM

Average rainfall in September - Los Alamos, NM
  • Average rainfall in September: 1.22"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is April (0.39").

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Average rainfall days in September
Los Alamos, NM

Average rainfall days in September - Los Alamos, NM
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is July (18.2 days).
The month with the least rainy days is November (5.1 days).

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Average snowfall in September
Los Alamos, NM

Average snowfall in September - Los Alamos, NM
  • Average snowfall in September: 0"

The month with the highest snowfall is January (5.24").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Los Alamos, NM

Average snowfall days in September - Los Alamos, NM
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (8.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Los Alamos, NM

Average daylight in September / Average sunshine in September - Los Alamos, NM
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 11.4h

The month with the most sunshine is June (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 7.1).

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Average sunshine days in September
Los Alamos, NM

Average sunshine days in September - Los Alamos, NM
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is July (8.9 days).

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Average UV index in September
Los Alamos, NM

Average UV index in September - Los Alamos, NM
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Los Alamos, NM

Average cloud cover in September - Los Alamos, NM
  • Average cloud cover in September: 12

The month with the most cloud cover is January (Cloud cover 22).
The month with the least cloud cover is June (Cloud cover 10).

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Average visibility in September
Los Alamos, NM

Average visibility in September - Los Alamos, NM
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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