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
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a very hot 97.3°F (36.3°C) to a tropical 88.9°F (31.6°C). Nighttime temperatures consistently average a pleasant 71.2°F (21.8°C) during September.Humidity
In Mountain Pass, the average relative humidity in September is 23%.Rainfall
In Mountain Pass, during September, the rain falls for 4 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Mountain Pass, during the entire year, the rain falls for 42.9 days and collects up to 3.23" (82mm) of precipitation.Snowfall
In Mountain Pass, snow does not fall in January, March through December.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:08 pm. On the last day of September, sunrise is at 6:36 am and sunset at 6:26 pm PDT.
Sunshine
In Mountain Pass, the average sunshine in September is 10.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 6 in September transforms into this advice:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Mountain Pass, CA
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is December (50.9°F).
- Average low temperature in September: 71.2°F
The months with the highest average low temperature are July and August (78.4°F).
The coldest month (with the lowest average low temperature) is December (38.8°F).
Average pressure in September
Mountain Pass, CA
- Average pressure in September: 29.85"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.76"Hg).
Average wind speed in September
Mountain Pass, CA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is January (5.4mph).
Average humidity in September
Mountain Pass, CA
- Average humidity in September: 23%
The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is June (15%).
Average rainfall in September
Mountain Pass, CA
- Average rainfall in September: 0.28"
The wettest months (with the highest rainfall) are July and August (0.55").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Mountain Pass, CA
- Average rainfall days in September: 4 days
The month with the highest number of rainy days is July (6.1 days).
The month with the least rainy days is June (0.9 days).
Average snowfall in September
Mountain Pass, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.24").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Mountain Pass, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Mountain Pass, CA
- Average daylight in September: 12h and 2min
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 48min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Mountain Pass, CA
- Average sunshine days in September: 22.7 days
The month with the most sunshine days is June (27.6 days).
The month with the least sunshine days is July (18.7 days).
Average UV index in September
Mountain Pass, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Mountain Pass, CA
- Average cloud cover in September: 7
The months with the most cloud cover are January and December (Cloud cover 19).
The months with the least cloud cover are June and August (Cloud cover 6).
Average visibility in September
Mountain Pass, 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).
Mountain Pass, California, USA
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