September weather forecastLos Alamitos, CA
September
Weather in September
The first month of the autumn, September, is still a warm month in Los Alamitos, California, with an average temperature ranging between max 78.4°F (25.8°C) and min 65.1°F (18.4°C).Temperature
As Los Alamitos transitions from August to September, the average high-temperatures adjust to a still moderately hot 78.4°F (25.8°C), nearly the same as the previous 79°F (26.1°C). During the nights in September, Los Alamitos observes an average low-temperature of 65.1°F (18.4°C).Humidity
In September, the average relative humidity in Los Alamitos is 64%.Rainfall
In Los Alamitos, in September, it is raining for 1.6 days, with typically 0.04" (1mm) of accumulated precipitation. In Los Alamitos, during the entire year, the rain falls for 27 days and collects up to 1.65" (42mm) of precipitation.Daylight
In Los Alamitos, the average length of the day in September is 12h and 22min.On the first day of September, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
In Los Alamitos, California, the average sunshine in September is 10.6h.UV index
July through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 6 suggests these recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Los Alamitos, CA
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is August (79°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in September: 65.1°F
The months with the highest average low temperature are August and September (65.1°F).
The coldest month (with the lowest average low temperature) is February (52°F).
Average pressure in September
Los Alamitos, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.89"Hg).
Average wind speed in September
Los Alamitos, CA
- Average wind speed in September: 5.1mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (5.1mph).
Average humidity in September
Los Alamitos, CA
- Average humidity in September: 64%
The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (56%).
Average rainfall in September
Los Alamitos, CA
- Average rainfall in September: 0.04"
The wettest months (with the highest rainfall) are February and December (0.31").
The driest month (with the least rainfall) is June (0").
Average rainfall days in September
Los Alamitos, CA
- Average rainfall days in September: 1.6 days
The month with the highest number of rainy days is March (4.9 days).
The month with the least rainy days is June (0.7 days).
Average daylight in September /
Average sunshine in September
Los Alamitos, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 36min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Los Alamitos, CA
- Average sunshine days in September: 26.8 days
The month with the most sunshine days is June (28.8 days).
The month with the least sunshine days is February (24.2 days).
Average UV index in September
Los Alamitos, CA
- Average UV index in September: 6
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in September
Los Alamitos, CA
- Average cloud cover in September: 9
The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Los Alamitos, 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).
