September weather forecastLos Alamos, NM
September
Weather in September
September marks the beginning of fall in Los Alamos. The summer heat tapers off to give way to a cooler and cozier ambit. The city is decorated in hues of orange and brown as the telltale signs of autumn make an appearance. With the temperature dropping to 73.9°F (23.3°C), the city displays a kaleidoscope of warm fall colors. The peaceful charm of September offers a perfect retreat for natives and visitors alike.Temperature
September witnesses a gentle descent in average high-temperature, descending from August's 79.7°F (26.5°C) to a still warm 73.9°F (23.3°C). September nights bring a significant cooling from the heat of the day, with averages of 51.6°F (10.9°C).Humidity
The average relative humidity in September is 49%.Rainfall
In Los Alamos, in September, 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 in Los Alamos.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 7:00 am and sunset at 6:49 pm MDT.
Sunshine
In Los Alamos, 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 estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the UV index of 4 transforms into the following advice:
Exercise prevention - Protecting skin and eyes from harm is required. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Los Alamos, NM
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- 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).
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).
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).
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).
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).
