September weather forecast
Los Alamos, NM

Weather in September

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

Temperature

In September, 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

The average relative humidity in September in Los Alamos is 49%.

Rainfall

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

Snowfall

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

Daylight

In Los Alamos, the average length of the day in September is 12h and 23min.
On the first day of September, sunrise is at 6:37 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:50 pm MDT.

Sunshine

In Los Alamos, New Mexico, the average sunshine in September is 11.4h.

UV index

In Los Alamos, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Los Alamos?

The average high-temperature, in September, in Los Alamos, is 73.9°F (23.3°C), while the average low-temperature is 51.6°F (10.9°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in July is appraised at 82.4°F (28°C).

What is the average humidity in September in Los Alamos?

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

How much does it rain in Los Alamos in September?

In Los Alamos, in September, during 11.7 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

When it does not snow in Los Alamos?

June through September are months without snowfall.

Does it snow in Los Alamos in September?

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

What is the average length of the day in September in Los Alamos?

The average day length in September in Los Alamos is 12h and 23min.

When are sunrise and sunset in September in Los Alamos?

On the first day of September, sunrise is at 6:37 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:50 pm MDT.

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

In Los Alamos, New Mexico, the average sunshine duration in September is 11.4h.

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

In September, the average daily maximum UV index in Los Alamos, New Mexico, is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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").
The 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).
The 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: 12h and 23min

The month with the longest days is June (Average daylight: 14h and 34min).
The month with the shortest days is December (Average daylight: 9h and 46min).

  • Average sunshine in September: 11h and 24min

The month with the most sunshine is June (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 7h and 6min).

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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).
The 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

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

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