September weather forecast
Riverview Farms, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Riverview Farms, California, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 63.5°F (17.5°C).

Temperature

The advent of September sees the average high-temperature at a still moderately hot 83.3°F (28.5°C), subtly shifted from August's 85.5°F (29.7°C). During September, Riverview Farms experiences an average low-temperature of 63.5°F (17.5°C) at night.

Heat index

September's mean heat index is appraised at a hot 86°F (30°C). When exposure and activity are sustained, they could induce fatigue, with a chance of heat cramps.
Heat index determinations are made taking into account the shade and light air movements. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

The average relative humidity in September is 57%.

Rainfall

In Riverview Farms, California, in September, during 3.9 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. Throughout the year, there are 49.6 rainfall days, and 5.16" (131mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of September in Riverview Farms, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:33 pm PDT.

Sunshine

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

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, a regular UV index of 6 translates into these guidelines:
Deflect overexposure. Sun protection is a necessity. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.

Frequently asked questions

Is it hot during September?

In September, the average high-temperature and low-temperature in Riverview Farms are 83.3°F (28.5°C) and 63.5°F (17.5°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is appraised at 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 57%.

How many days does it rain in September?

In Riverview Farms, in September, it is raining for 3.9 days, with typically 0.31" (8mm) of accumulated precipitation.

How many hours of daylight does Riverview Farms have in September?

In September, the average day length is 12h and 22min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:33 pm PDT.

How long on average sun shines in September?

In Riverview Farms, the average sunshine duration in September is 10.4h.

What is the month with the highest UV index?

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

What is the UV index intensity in September?

In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Riverview Farms, CA

Average temperature in September - Riverview Farms, CA
  • Average high temperature in September: 83.3°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).

Average pressure in September
Riverview Farms, CA

Average pressure in September - Riverview Farms, CA
  • Average pressure in September: 29.87"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in September
Riverview Farms, CA

Average wind speed in September - Riverview Farms, CA
  • Average wind speed in September: 4.2mph

The windiest months (with the highest average wind speed) are April and May (5.3mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.2mph).

Average humidity in September
Riverview Farms, CA

Average humidity in September - Riverview Farms, CA
  • Average humidity in September: 57%

The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is November (52%).

Average rainfall in September
Riverview Farms, CA

Average rainfall in September - Riverview Farms, CA
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in September
Riverview Farms, CA

Average rainfall days in September - Riverview Farms, CA
  • Average rainfall days in September: 3.9 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).

Average daylight in September /
Average sunshine in September
Riverview Farms, CA

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 2min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

Average sunshine days in September
Riverview Farms, CA

Average sunshine days in September - Riverview Farms, CA
  • Average sunshine days in September: 23.1 days

The month with the most sunshine days is June (28 days).
The month with the least sunshine days is July (20.7 days).

Average UV index in September
Riverview Farms, CA

Average UV index in September - Riverview Farms, CA
  • Average UV index in September: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Riverview Farms, CA

Average cloud cover in September - Riverview Farms, CA
  • Average cloud cover in September: 9

The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).

Average visibility in September
Riverview Farms, CA

Average visibility in September - Riverview Farms, 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).

Riverview Farms, California, USA

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