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
Helendale's September weather shows a modest shift in high-temperatures, falling from August's hot 91.9°F (33.3°C) to a moderately hot 85.8°F (29.9°C). Despite high daytime temperatures, the average temperature lowers to a refreshing 63.5°F (17.5°C) during September nights.Humidity
In Helendale, the average relative humidity in September is 32%.Rainfall
In Helendale, during September, the rain falls for 2.7 days and regularly aggregates up to 0.28" (7mm) of precipitation. Throughout the year, there are 44.8 rainfall days, and 4.8" (122mm) of precipitation is accumulated.Snowfall
In Helendale, snow does not fall in March, May through October.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:22 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:34 pm PDT.
Sunshine
The average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 6 in September transforms into this advice:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in 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?
What is the UV index reading in September?
Average temperature in September
Helendale, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is July (92.1°F).
The month with the lowest average high temperature is December (53.2°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is December (38.3°F).
Average pressure in September
Helendale, CA
- Average pressure in September: 29.87"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Helendale, CA
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is May (10.3mph).
The calmest month (with the lowest average wind speed) is January (6.3mph).
Average humidity in September
Helendale, CA
- Average humidity in September: 32%
The month with the highest relative humidity is December (52%).
The month with the lowest relative humidity is August (27%).
Average rainfall in September
Helendale, CA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is December (0.98").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Helendale, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (6 days).
The month with the least rainy days is June (0.9 days).
Average snowfall in September
Helendale, CA
- Average snowfall in September: 0"
The month with the highest snowfall is November (1.73").
The months with the least snowfall are March, May, June, July, August, September and October (0").
Average snowfall days in September
Helendale, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Helendale, 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 54min).
- Average sunshine in September: 10h and 4min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 7h and 0min).
Average sunshine days in September
Helendale, CA
- Average sunshine days in September: 25.9 days
The month with the most sunshine days is June (28.9 days).
The month with the least sunshine days is February (22.4 days).
Average UV index in September
Helendale, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Helendale, CA
- Average cloud cover in September: 6
The month with the most cloud cover is December (Cloud cover 21).
The months with the least cloud cover are June and August (Cloud cover 5).
Average visibility in September
Helendale, 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).
Helendale, California, USA
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