Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 76.5°F (24.7°C) in August to a pleasant 70.7°F (21.5°C). In September, El Portal experiences a significant drop from daily zeniths to an average nighttime temperature of 45.7°F (7.6°C).Humidity
In September, the average relative humidity in El Portal is 40%.Rainfall
In El Portal, in September, during 3.5 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. In El Portal, during the entire year, the rain falls for 48.1 days and collects up to 17.36" (441mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in El Portal. September is the first month it typically snows in El Portal. Throughout September, in the average 0.6 snowfall days, it receives 0.12" (3mm) of snow. In El Portal, during the entire year, snow falls for 62.1 days and aggregates up to 106.54" (2706mm) of snow.Daylight
In September, the average length of the day in El Portal is 12h and 25min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:27 pm. On the last day of September, in El Portal, California, sunrise is at 6:54 am and sunset at 6:43 pm PDT.
Sunshine
The average sunshine in September in El Portal, California, is 11.2h.UV index
In El Portal, California, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: An average UV index of 4 in September transforms into this advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for El Portal in September?
What is the average humidity in September in El Portal?
How many days does it rain in September in El Portal?
When does it start snowing in El Portal?
What is the average length of the day in September in El Portal?
When are sunrise and sunset in September in El Portal?
How many hours of sunshine does El Portal have in September?
How high is the UV index in September in El Portal?
Average temperature in September
El Portal, CA
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (40.1°F).
- Average low temperature in September: 45.7°F
The month with the highest average low temperature is July (51.4°F).
The coldest month (with the lowest average low temperature) is December (22.3°F).
Average pressure in September
El Portal, CA
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
El Portal, CA
- Average wind speed in September: 5.2mph
The windiest months (with the highest average wind speed) are February and March (5.5mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).
Average humidity in September
El Portal, CA
- Average humidity in September: 40%
The month with the highest relative humidity is March (78%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall in September
El Portal, CA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is February (2.76").
The driest month (with the least rainfall) is August (0.24").
Average rainfall days in September
El Portal, CA
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is May (7.7 days).
The month with the least rainy days is November (2.1 days).
Average snowfall in September
El Portal, CA
- Average snowfall in September: 0.12"
The month with the highest snowfall is March (19.92").
The months with the least snowfall are July and August (0").
Average snowfall days in September
El Portal, CA
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is March (11.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
El Portal, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in September
El Portal, CA
- Average sunshine days in September: 23.7 days
The month with the most sunshine days is October (26 days).
The month with the least sunshine days is April (17 days).
Average UV index in September
El Portal, CA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
El Portal, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
El Portal, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is March (5mi).
El Portal, California, USA
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