September weather forecast and climate
Spreckels, CA

Weather in September

September, the first month of the autumn, in Spreckels, is still a warm month, with average temperature ranging between min 54.7°F (12.6°C) and max 76.1°F (24.5°C).

Temperature

August and September, with an average high-temperature of 76.1°F (24.5°C), are the warmest months.

Humidity

In Spreckels, the average relative humidity in September is 67%.

Rainfall

In September, the rain falls for 2.2 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. In Spreckels, California, during the entire year, the rain falls for 57.8 days and collects up to 6.57" (167mm) of precipitation.

Daylight

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

Sunshine

In Spreckels, California, the average sunshine in September is 11.2h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 are the warmest months in Spreckels?

Warmest months are August and September, with an average high-temperature of 76.1°F (24.5°C).

What is the temperature in September in Spreckels?

In September, in Spreckels, California, the average high-temperature is 76.1°F (24.5°C), and the average low-temperature is 54.7°F (12.6°C).

What is the average humidity in September in Spreckels?

In Spreckels, the average relative humidity in September is 67%.

How many days does it rain in September in Spreckels?

In Spreckels, California, in September, it is raining for 2.2 days, with typically 0.08" (2mm) of accumulated precipitation.

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

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

How long on average sun shines in September in Spreckels?

In Spreckels, the average sunshine in September is 11.2h.

When is the highest UV index in Spreckels?

June through September, with an average maximum UV index of 5, are months with the highest UV index in Spreckels.

How high is the UV index in September in Spreckels?

The average daily maximum UV index in September in Spreckels is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in September
Spreckels, CA

Average temperature in September - Spreckels, CA
  • Average high temperature in September: 76.1°F

The warmest months (with the highest average high temperature) are August and September (76.1°F).
The month with the lowest average high temperature is December (57.6°F).

  • Average low temperature in September: 54.7°F

Months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).

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Average pressure in September
Spreckels, CA

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

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in September
Spreckels, CA

Average wind speed in September - Spreckels, CA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).

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Average humidity in September
Spreckels, CA

Average humidity in September - Spreckels, CA
  • Average humidity in September: 67%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in September
Spreckels, CA

Average rainfall in September - Spreckels, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (1.38").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in September
Spreckels, CA

Average rainfall days in September - Spreckels, CA
  • Average rainfall days in September: 2.2 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.8 days).

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

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

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11.2h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in September
Spreckels, CA

Average sunshine days in September - Spreckels, CA
  • Average sunshine days in September: 26.7 days

The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (19.2 days).

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Average UV index in September
Spreckels, CA

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

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in September
Spreckels, CA

Average cloud cover in September - Spreckels, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in September
Spreckels, CA

Average visibility in September - Spreckels, 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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