September weather forecast and climate
Santee, CA

Weather in September

The first month of the autumn, September, is still a warm month in Santee, California, with average temperature ranging between min 63.7°F (17.6°C) and max 82.8°F (28.2°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still moderately hot 82.8°F (28.2°C). The average low-temperature, in September, is 63.7°F (17.6°C).

Heat index

The average heat index is appraised at 85.3°F (29.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like metabolic differences, clothing, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in September is 59%.

Rainfall

In September, in Santee, the rain falls for 3.4 days. Throughout September, 0.28" (7mm) of precipitation is accumulated. Throughout the year, there are 47.9 rainfall days, and 5.31" (135mm) of precipitation is accumulated.

Daylight

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

Sunshine

In September, the average sunshine is 10.4h.

UV index

Months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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.
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FAQ

What is the temperature in September in Santee?

In Santee, California, in September, the average high-temperature is 82.8°F (28.2°C), and the average low-temperature is 63.7°F (17.6°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), that combines air temperature and relative humidity, is calculated to 85.3°F (29.6°C).

What is the average humidity in September in Santee?

In Santee, the average relative humidity in September is 59%.

How much does it rain in Santee in September?

In Santee, in September, during 3.4 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

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

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

How long on average sun shines in September in Santee?

In Santee, California, the average sunshine in September is 10.4h.

When is the highest UV index in Santee?

June through September, with an average maximum UV index of 6, are months with the highest UV index in Santee.

How high is the UV index in September in Santee?

The average daily maximum UV index in September in Santee is 6. A UV Index value of 6 to 7 symbolizes a high health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Santee, CA

Average temperature in September - Santee, CA
  • Average high temperature in September: 82.8°F

The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (64°F).

  • Average low temperature in September: 63.7°F

The month with the highest average low temperature is August (65.3°F).
The coldest month (with the lowest average low temperature) is February (46.9°F).

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Average pressure in September
Santee, CA

Average pressure in September - Santee, CA
  • Average pressure in September: 29.87"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.87").

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Average wind speed in September
Santee, CA

Average wind speed in September - Santee, CA
  • Average wind speed in September: 4.3mph

The windiest month (with the highest average wind speed) is April (5.4mph).
The calmest month (with the lowest average wind speed) is October (4.2mph).

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Average humidity in September
Santee, CA

Average humidity in September - Santee, CA
  • Average humidity in September: 59%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (54%).

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Average rainfall in September
Santee, CA

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

The wettest month (with the highest rainfall) is February (1.14").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Santee, CA

Average rainfall days in September - Santee, CA
  • Average rainfall days in September: 3.4 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (1.4 days).

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

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

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.4h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Santee, CA

Average sunshine days in September - Santee, CA
  • Average sunshine days in September: 24.2 days

The month with the most sunshine days is June (28 days).
The month with the least sunshine days is February (22.3 days).

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Average UV index in September
Santee, CA

Average UV index in September - Santee, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in September
Santee, CA

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

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Santee, CA

Average visibility in September - Santee, 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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