September weather forecast
Rackerby, CA

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Weather in September

September, the first month of the autumn in Rackerby, is also a hot month, with an average temperature varying between 87.1°F (30.6°C) and 59.7°F (15.4°C).

Temperature

The transition into September involves a small decrease in the average high-temperature, dipping slightly from a tropical 92.8°F (33.8°C) in August to a still hot 87.1°F (30.6°C). Despite higher daytime temperatures, nighttime averages fall to a refreshing 59.7°F (15.4°C) in September.

Humidity

In September, the average relative humidity is 37%.

Rainfall

In Rackerby, in September, during 2.4 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Rackerby, during the entire year, the rain falls for 71.4 days and collects up to 15.31" (389mm) of precipitation.

Snowfall

January, March through December are months without snowfall in Rackerby, California.

Daylight

In Rackerby, the average length of the day in September is 12h and 26min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm PDT.

Sunshine

In September, the average sunshine is 11.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Experience reduced UV exposure by about half when donning a wide-brim hat.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is September?

In September, the average high-temperature and low-temperature are 87.1°F (30.6°C) and 59.7°F (15.4°C) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in June is calculated to be 86°F (30°C).

What is the average humidity in September in Rackerby?

The average relative humidity in September in Rackerby is 37%.

How many days does it rain in September in Rackerby?

In Rackerby, in September, during 2.4 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

When it does not snow?

January, March through December are months without snowfall.

How many hours of daylight does Rackerby have in September?

The average day length in September is 12h and 26min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:34 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm PDT.

How many hours of sunshine does Rackerby have in September?

In Rackerby, the average sunshine duration in September is 11.3h.

How high is the UV index in September?

In Rackerby, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Rackerby, CA

Average temperature in September - Rackerby, CA
  • Average high temperature in September: 87.1°F

The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is December (53.6°F).

  • Average low temperature in September: 59.7°F

The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is December (39.7°F).

Average pressure in September
Rackerby, CA

Average pressure in September - Rackerby, CA
  • Average pressure in September: 29.92"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
Rackerby, CA

Average wind speed in September - Rackerby, CA
  • Average wind speed in September: 5.1mph

The windiest month (with the highest average wind speed) is March (6mph).
The calmest months (with the lowest average wind speed) are August and November (5mph).

Average humidity in September
Rackerby, CA

Average humidity in September - Rackerby, CA
  • Average humidity in September: 37%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (35%).

Average rainfall in September
Rackerby, CA

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

The wettest month (with the highest rainfall) is March (2.87").
The driest month (with the least rainfall) is July (0.04").

Average rainfall days in September
Rackerby, CA

Average rainfall days in September - Rackerby, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (1.6 days).

Average snowfall in September
Rackerby, CA

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

The month with the highest snowfall is February (0.04").
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
Rackerby, CA

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

The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in September / Average sunshine in September - Rackerby, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in September: 11h and 2min

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 48min).

Average sunshine days in September
Rackerby, CA

Average sunshine days in September - Rackerby, CA
  • Average sunshine days in September: 27 days

The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (17.4 days).

Average UV index in September
Rackerby, CA

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

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

Average cloud cover in September
Rackerby, CA

Average cloud cover in September - Rackerby, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 4).

Average visibility in September
Rackerby, CA

Average visibility in September - Rackerby, 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).

Rackerby, California, USA

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