September weather forecastLos Alamos, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Los Alamos, California, with temperature in the range of an average high of 77.5°F (25.3°C) and an average low of 61.2°F (16.2°C).Temperature
As Los Alamos steps into September, the average high-temperature holds at a still moderately hot 77.5°F (25.3°C), hinting at a minor fluctuation from the prior month. Nighttime temperature in Los Alamos experiences an average drop to a comfortable 61.2°F (16.2°C) in September.Humidity
In September, the average relative humidity 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. In Los Alamos, during the entire year, the rain falls for 37.7 days and collects up to 5.98" (152mm) of precipitation.Daylight
In Los Alamos, California, the average length of the day in September is 12h and 23min.On the first day of September in Los Alamos, sunrise is at 6:34 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:45 pm PDT.
Sunshine
The average sunshine in September is 11.3h.UV index
In Los Alamos, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Take necessary precautions - Protection from skin and eye injury is mandatory. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Los Alamos, CA
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).
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).
Average humidity in September
Los Alamos, CA
- Average humidity in September: 59%
The month with the highest relative humidity is March (67%).
The months with the lowest relative humidity are October and November (58%).
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").
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).
Average daylight in September /
Average sunshine in September
Los Alamos, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 11h and 18min
The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
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).
Average UV index in September
Los Alamos, CA
- Average UV index in September: 5
The 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).
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).
Average visibility in September
Los Alamos, CA
- 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).
