September weather forecast
El Rio, CA

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Weather in September

The first month of the autumn, September, is still a warm month in El Rio, California, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 63°F (17.2°C).

Temperature

August and September are known as El Rio's warmest months, with an average high-temperature of 73.4°F (23°C).

Humidity

The average relative humidity in September is 65%.

Rainfall

In El Rio, during September, the rain falls for 3 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, there are 46.5 rainfall days, and 8.31" (211mm) of precipitation is accumulated.

Daylight

The average length of the day in September in El Rio, California, is 12h and 22min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:22 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:41 pm PDT.

Sunshine

In El Rio, the average sunshine in September is 10.9h.

UV index

In El Rio, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 5 in September translates into this advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Enhance your sun protection with tightly woven, yet airy clothing.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the warmest month in El Rio?

During August and September, El Rio experiences its average highest temperatures, peaking at 73.4°F (23°C).

What are September temperatures in El Rio?

In September, in El Rio, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 63°F (17.2°C).

What is the average humidity in September in El Rio?

The average relative humidity in September in El Rio, California, is 65%.

How many days does it rain in September in El Rio?

In September, the rain falls for 3 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

What is the average length of the day in September in El Rio?

The average day length in September is 12h and 22min.

When is the sunrise / sunset in September in El Rio?

On the first day of September, sunrise is at 6:30 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm PDT.

How long on average sun shines in September in El Rio?

In September, the average sunshine duration is 10.9h.

What is the UV index intensity in September in El Rio?

In September, the average daily maximum UV index in El Rio is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to 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
El Rio, CA

Average temperature in September - El Rio, CA
  • Average high temperature in September: 73.4°F

The warmest months (with the highest average high temperature) are August and September (73.4°F).
The month with the lowest average high temperature is February (59°F).

  • Average low temperature in September: 63°F

The month with the highest average low temperature is September (63°F).
The coldest months (with the lowest average low temperature) are February and December (50.5°F).

Average pressure in September
El Rio, CA

Average pressure in September - El Rio, CA
  • Average pressure in September: 29.9"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.9"Hg).

Average wind speed in September
El Rio, CA

Average wind speed in September - El Rio, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in September
El Rio, CA

Average humidity in September - El Rio, CA
  • Average humidity in September: 65%

The month with the highest relative humidity is June (72%).
The month with the lowest relative humidity is November (57%).

Average rainfall in September
El Rio, CA

Average rainfall in September - El Rio, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is January (1.85").
The driest month (with the least rainfall) is June (0.08").

Average rainfall days in September
El Rio, CA

Average rainfall days in September - El Rio, CA
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is August (1.3 days).

Average daylight in September /
Average sunshine in September
El Rio, CA

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

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

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 6h and 48min).

Average sunshine days in September
El Rio, CA

Average sunshine days in September - El Rio, CA
  • Average sunshine days in September: 24.1 days

The month with the most sunshine days is October (27.2 days).
The month with the least sunshine days is February (21.7 days).

Average UV index in September
El Rio, CA

Average UV index in September - El Rio, CA
  • Average UV index in September: 5

The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 4).

Average cloud cover in September
El Rio, CA

Average cloud cover in September - El Rio, CA
  • Average cloud cover in September: 7

The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in September
El Rio, CA

Average visibility in September - El Rio, 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).

El Rio, California, USA

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