September weather forecast and climate
Hesperia, CA

Weather in September

The first month of the autumn, September, is also a moderately hot month in Hesperia, California, with average temperature fluctuating between 63°F (17.2°C) and 85.5°F (29.7°C).

Temperature

In September, the average high-temperature slightly decreases, from a hot 91°F (32.8°C) in August, to a moderately hot 85.5°F (29.7°C). The average low-temperature, in September, is 63°F (17.2°C).

Humidity

In September, the average relative humidity is 34%.

Rainfall

In Hesperia, California, during September, the rain falls for 3.3 days and regularly aggregates up to 0.28" (7mm) of precipitation. Throughout the year, in Hesperia, there are 49.8 rainfall days, and 5.71" (145mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In Hesperia, the average sunshine in September is 10.7h.

UV index

In Hesperia, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Hesperia?

The average high-temperature, in September, in Hesperia, California, is 85.5°F (29.7°C), while the average low-temperature is 63°F (17.2°C).

What is the average humidity in September in Hesperia?

The average relative humidity in September is 34%.

How many days does it rain in September in Hesperia?

In Hesperia, in September, it is raining for 3.3 days, with typically 0.28" (7mm) of accumulated precipitation.

When it does not snow in Hesperia?

May through October are months without snowfall in Hesperia.

What is the average length of the day in September in Hesperia?

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

How long on average sun shines in September in Hesperia?

The average sunshine in September in Hesperia is 10.7h.

What is the UV index intensity in September in Hesperia?

The average daily maximum UV index in September in Hesperia, California, is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Hesperia, CA

Average temperature in September - Hesperia, CA
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is December (54.1°F).

  • Average low temperature in September: 63°F

The month with the highest average low temperature is August (67.5°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).

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Average pressure in September
Hesperia, CA

Average pressure in September - Hesperia, CA
  • Average pressure in September: 29.86"

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.83").

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Average wind speed in September
Hesperia, CA

Average wind speed in September - Hesperia, CA
  • Average wind speed in September: 6.5mph

The windiest months (with the highest average wind speed) are April and May (9.1mph).
The calmest month (with the lowest average wind speed) is January (6.2mph).

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Average humidity in September
Hesperia, CA

Average humidity in September - Hesperia, CA
  • Average humidity in September: 34%

The month with the highest relative humidity is December (52%).
The month with the lowest relative humidity is August (30%).

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Average rainfall in September
Hesperia, CA

Average rainfall in September - Hesperia, CA
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is December (1.18").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Hesperia, CA

Average rainfall days in September - Hesperia, CA
  • Average rainfall days in September: 3.3 days

The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (0.8 days).

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Average snowfall in September
Hesperia, CA

Average snowfall in September - Hesperia, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is November (1.85").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Hesperia, CA

Average snowfall days in September - Hesperia, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.4 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Hesperia, CA

Average daylight in September / Average sunshine in September - Hesperia, 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: 10.7h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 7h).

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Average sunshine days in September
Hesperia, CA

Average sunshine days in September - Hesperia, CA
  • Average sunshine days in September: 25.8 days

The month with the most sunshine days is June (28.8 days).
The month with the least sunshine days is February (21.6 days).

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Average UV index in September
Hesperia, CA

Average UV index in September - Hesperia, CA
  • Average UV index in September: 5

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).

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Average cloud cover in September
Hesperia, CA

Average cloud cover in September - Hesperia, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 21).
Months with the least cloud cover are June, August and September (Cloud cover 6).

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Average visibility in September
Hesperia, CA

Average visibility in September - Hesperia, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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