September weather forecast and climate
Paso Robles, CA

Sunrise over the Valley Oak vineyard farm in Paso Robles, California
Sunrise over the Valley Oak vineyard farm in Paso Robles, California

Weather in September

The first month of the autumn, September, is still a warm month in Paso Robles, California, with temperature in the range of an average high of 84.2°F (29°C) and an average low of 59.9°F (15.5°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a moderately hot 84.2°F (29°C). In September, in Paso Robles, the average low-temperature is 59.9°F (15.5°C).

Heat index

The average heat index in September is appraised at 84.9°F (29.4°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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like wind, differences in body mass, height, and shape, clothing, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

With an average relative humidity of 48%, September is the least humid month.

Rainfall

In Paso Robles, during September, the rain falls for 1.5 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Paso Robles, during the entire year, the rain falls for 46.4 days and collects up to 4.49" (114mm) of precipitation.

Daylight

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

Sunshine

In Paso Robles, the average sunshine in September is 11.4h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Paso Robles. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 is the temperature in September in Paso Robles?

In September, in Paso Robles, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 59.9°F (15.5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, is calculated to 84.9°F (29.4°C).

What is the least humid month in Paso Robles?

The least humid month in Paso Robles is September, with an average relative humidity of 48%.

What is the average humidity in September in Paso Robles?

In September, the average relative humidity is 48%.

How many days does it rain in September in Paso Robles?

In September, in Paso Robles, the rain falls for 1.5 days. Throughout September, 0.08" (2mm) of precipitation is accumulated.

How many hours of daylight does Paso Robles have in September?

The average length of the day in September in Paso Robles, California, is 12.4h.

How long on average sun shines in September in Paso Robles?

In September, the average sunshine in Paso Robles, California, is 11.4h.

When is the highest UV index in Paso Robles?

Months with the highest UV index in Paso Robles, California, are June through September, with an average maximum UV index of 6.

What is the UV index intensity in September in Paso Robles?

In Paso Robles, California, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Paso Robles, CA

Average temperature in September - Paso Robles, CA
  • Average high temperature in September: 84.2°F

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (58.3°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is February (42.4°F).

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Average pressure in September
Paso Robles, CA

Average pressure in September - Paso Robles, CA
  • Average pressure in September: 29.91"

The month with the highest atmospheric pressure is January (30.12").
Months with the lowest atmospheric pressure are June, August and September (29.91").

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Average wind speed in September
Paso Robles, CA

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

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).

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Average humidity in September
Paso Robles, CA

Average humidity in September - Paso Robles, CA
  • Average humidity in September: 48%

Months with the highest relative humidity are February and March (68%).
The month with the lowest relative humidity is September (48%).

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Average rainfall in September
Paso Robles, CA

Average rainfall in September - Paso Robles, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is March (0.94").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in September
Paso Robles, CA

Average rainfall days in September - Paso Robles, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (9.1 days).
The month with the least rainy days is August (0.7 days).

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Average daylight in September /
Average sunshine in September
Paso Robles, CA

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

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 11.4h

Months with the most sunshine are June, July and August (Average sunshine: 12h).
Months with the least sunshine are February and December (Average sunshine: 6.3).

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Average sunshine days in September
Paso Robles, CA

Average sunshine days in September - Paso Robles, CA
  • Average sunshine days in September: 28.1 days

The month with the most sunshine days is August (29.8 days).
Months with the least sunshine days are February and March (21 days).

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Average UV index in September
Paso Robles, CA

Average UV index in September - Paso Robles, 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 February, November and December (UV index 3).

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Average cloud cover in September
Paso Robles, CA

Average cloud cover in September - Paso Robles, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is March (Cloud cover 30).
Months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in September
Paso Robles, CA

Average visibility in September - Paso Robles, 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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