September weather forecast and climate
Davis, CA

September, the first month of the autumn, in Davis, is still a tropical month, with average temperature fluctuating between 88.7°F (31.5°C) and 58.6°F (14.8°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still tropical 88.7°F (31.5°C). In September, the average low-temperature is 58.6°F (14.8°C).

Heat index

The average heat index is evaluated at a hot 90.5°F (32.5°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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', 'feels like', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, clothing, wind, and metabolic differences affect individual temperature impact. 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 least humid month in Davis is September, with an average relative humidity of 45%.

Rainfall

In Davis, during September, the rain falls for 2.2 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Davis, during the entire year, the rain falls for 67.4 days and collects up to 12.17" (309mm) of precipitation.

Daylight

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

Sunshine

In September, the average sunshine is 11.2h.

UV index

The average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
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.

What is the temperature in September in Davis?

The average high-temperature, in September, in Davis, California, is 88.7°F (31.5°C), while the average low-temperature is 58.6°F (14.8°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, in September is calculated to 90.5°F (32.5°C).

What is the least humid month in Davis?

With an average relative humidity of 45%, September is the least humid month in Davis.

What is the average humidity in September in Davis?

In September, the average relative humidity in Davis is 45%.

How much does it rain in Davis in September?

In Davis, in September, it is raining for 2.2 days, with typically 0.12" (3mm) of accumulated precipitation.

How many hours of daylight does Davis have in September?

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

How many hours of sunshine does Davis have in September?

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

What is the UV index intensity in September in Davis?

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in September - Davis, CA
  • Average high temperature in September: 88.7°F

The warmest month (with the highest average high temperature) is July (93.6°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in September: 58.6°F

The month with the highest average low temperature is August (59.2°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).

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

The month with the highest atmospheric pressure is January (30.15").
Months with the lowest atmospheric pressure are June and August (29.91").

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

The windiest months (with the highest average wind speed) are May and June (6.3mph).
The calmest month (with the lowest average wind speed) is November (5mph).

Average humidity in September - Davis, CA
  • Average humidity in September: 45%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (45%).

Average rainfall in September - Davis, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (2.44").
The driest months (with the least rainfall) are July and August (0.04").

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

The month with the highest number of rainy days is March (12.5 days).
Months with the least rainy days are July and August (0.8 days).

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.6h).

Average sunshine days in September - Davis, CA
  • Average sunshine days in September: 27.6 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.8 days).

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

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

Average cloud cover in September - Davis, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 5).

Average visibility in September - Davis, 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).