September weather forecast and climate
Apple Valley, CA

The first month of the autumn, September, is still a warm month in Apple Valley, California, with temperature in the range of an average low of 64.4°F (18°C) and an average high of 85.8°F (29.9°C).

Temperature

In Apple Valley, the average high-temperature slightly decreases, from a hot 92.1°F (33.4°C) in August, to a warm 85.8°F (29.9°C). In Apple Valley, the average low-temperature is 64.4°F (18°C).

Humidity

In Apple Valley, the average relative humidity is 30%.

Rainfall

In Apple Valley, in September, during 3 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Apple Valley, during the entire year, the rain falls for 46.2 days and collects up to 4.65" (118mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Apple Valley, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine in Apple Valley is 10.6h.

UV index

In September, the average daily maximum UV index in Apple Valley is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Apple Valley?

In September, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 64.4°F (18°C).

What is the average humidity in September in Apple Valley?

The average relative humidity in September is 30%.

How many days does it rain in September in Apple Valley?

In Apple Valley, California, during September, the rain falls for 3 days and regularly aggregates up to 0.28" (7mm) of precipitation.

When it does not snow in Apple Valley?

May through October are months without snowfall in Apple Valley.

What is the average length of the day in September in Apple Valley?

In September, the average length of the day in Apple Valley is 12.4h.

How many hours of sunshine does Apple Valley have in September?

In Apple Valley, the average sunshine in September is 10.6h.

What is the UV index intensity in September in Apple Valley?

In Apple Valley, California, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to the UV radiation.
Average temperature in September - Apple Valley, CA
  • Average high temperature in September: 29.9°C

The warmest month (with the highest average high temperature) is July (33.8°C).
The month with the lowest average high temperature is December (11.8°C).

  • Average low temperature in September: 18°C

The month with the highest average low temperature is August (20.8°C).
The coldest month (with the lowest average low temperature) is December (3.5°C).

Average pressure in September - Apple Valley, CA
  • Average pressure in September: 1011.2mbar

The month with the highest atmospheric pressure is January (1019.7mbar).
The month with the lowest atmospheric pressure is June (1009.8mbar).

Average wind speed in September - Apple Valley, CA
  • Average wind speed in September: 11.8km/h

The windiest month (with the highest average wind speed) is May (16.8km/h).
The calmest month (with the lowest average wind speed) is January (10km/h).

Average humidity in September - Apple Valley, CA
  • Average humidity in September: 30%

The month with the highest relative humidity is December (51%).
The month with the lowest relative humidity is August (26%).

Average rainfall in September - Apple Valley, CA
  • Average rainfall in September: 7mm

The wettest month (with the highest rainfall) is December (22mm).
The driest month (with the least rainfall) is June (1mm).

Average rainfall days in September - Apple Valley, CA
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is June (0.8 days).

Average snowfall in September - Apple Valley, CA
  • Average snowfall in September: 0mm

The month with the highest snowfall is November (40mm).
Months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September - Apple Valley, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Apple Valley, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.6h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January and December (Average sunshine: 7.1).

Average sunshine days in September - Apple Valley, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is June (29 days).
The month with the least sunshine days is February (22.2 days).

Average UV index in September - Apple Valley, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September - Apple Valley, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 20).
The month with the least cloud cover is June (Cloud cover 5).

Average visibility in September - Apple Valley, CA
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).