September weather forecast and climate
Los Alamos, CA

Weather in September

September, the first month of the autumn, in Los Alamos, is still a warm month, with average temperature ranging between min 61.2°F (16.2°C) and max 77.5°F (25.3°C).

Temperature

In Los Alamos, the average high-temperature is relatively the same as in August - a still warm 77.5°F (25.3°C). The average low-temperature, in Los Alamos, California, is 61.2°F (16.2°C).

Humidity

In Los Alamos, California, the average relative humidity in September is 59%.

Rainfall

In Los Alamos, during September, the rain falls for 1.6 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, in Los Alamos, there are 37.7 rainfall days, and 5.98" (152mm) of precipitation is accumulated.

Daylight

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

Sunshine

In Los Alamos, the average sunshine is 11.3h.

UV index

In Los Alamos, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Los Alamos?

The average high-temperature, in September, in Los Alamos, is 77.5°F (25.3°C), while the average low-temperature is 61.2°F (16.2°C).

What is the average humidity in September in Los Alamos?

In September, the average relative humidity is 59%.

How many days does it rain in September in Los Alamos?

In Los Alamos, during September, the rain falls for 1.6 days and regularly aggregates up to 0.08" (2mm) of precipitation.

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

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

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

The average sunshine in September in Los Alamos, California, is 11.3h.

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

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Los Alamos, CA

Average temperature in September - Los Alamos, CA
  • Average high temperature in September: 77.5°F

The warmest month (with the highest average high temperature) is August (78.8°F).
The month with the lowest average high temperature is December (61.2°F).

  • Average low temperature in September: 61.2°F

The month with the highest average low temperature is September (61.2°F).
The coldest month (with the lowest average low temperature) is February (47.8°F).

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Average pressure in September
Los Alamos, CA

Average pressure in September - Los Alamos, CA
  • Average pressure in September: 29.91"

The month with the highest atmospheric pressure is January (30.11").
Months with the lowest atmospheric pressure are June, August and September (29.91").

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Average wind speed in September
Los Alamos, CA

Average wind speed in September - Los Alamos, CA
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is May (8.9mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).

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Average humidity in September
Los Alamos, CA

Average humidity in September - Los Alamos, CA
  • Average humidity in September: 59%

The month with the highest relative humidity is March (67%).
Months with the lowest relative humidity are October and November (58%).

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Average rainfall in September
Los Alamos, CA

Average rainfall in September - Los Alamos, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is January (1.38").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Los Alamos, CA

Average rainfall days in September - Los Alamos, CA
  • Average rainfall days in September: 1.6 days

The month with the highest number of rainy days is March (6.2 days).
The month with the least rainy days is August (0.8 days).

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

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

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 11.3h

Months with the most sunshine are June and July (Average sunshine: 12h).
The month with the least sunshine is February (Average sunshine: 6.6h).

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Average sunshine days in September
Los Alamos, CA

Average sunshine days in September - Los Alamos, CA
  • Average sunshine days in September: 27.9 days

The month with the most sunshine days is August (29 days).
The month with the least sunshine days is February (22.3 days).

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Average UV index in September
Los Alamos, CA

Average UV index in September - Los Alamos, CA
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Los Alamos, CA

Average cloud cover in September - Los Alamos, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Los Alamos, CA

Average visibility in September - Los Alamos, CA
  • 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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