September weather forecast and climate
Pismo Beach, CA

Weather in September

The first month of the autumn, September, is still a warm month in Pismo Beach, California, with average temperature fluctuating between 59.9°F (15.5°C) and 79.5°F (26.4°C).

Temperature

September is the warmest month, with an average high-temperature of 79.5°F (26.4°C) and an average low-temperature of 59.9°F (15.5°C).

Humidity

The average relative humidity is 59%.

Rainfall

In Pismo Beach, in September, during 1.8 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, in Pismo Beach, there are 47.6 rainfall days, and 6.93" (176mm) of precipitation is accumulated.

Ocean temperature

In Pismo Beach, California, the average seawater temperature is 58.3°F (14.6°C).
Note: Swimming in 58.3°F (14.6°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

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

Sunshine

The average sunshine in September is 11.3h.

UV index

The average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV radiation 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. 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 warmest month in Pismo Beach?

September is the warmest month in Pismo Beach, with an average high-temperature of 79.5°F (26.4°C) and an average low-temperature of 59.9°F (15.5°C).

What is the average humidity in September in Pismo Beach?

In Pismo Beach, California, the average relative humidity in September is 59%.

How many days does it rain in September in Pismo Beach?

In Pismo Beach, during September, the rain falls for 1.8 days and regularly aggregates up to 0.08" (2mm) of precipitation.

How cold is the water in September in Pismo Beach?

In September, the average ocean temperature is 58.3°F (14.6°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in September in Pismo Beach?

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

How long on average sun shines in September in Pismo Beach?

The average sunshine in September in Pismo Beach, California, is 11.3h.

What is the UV index intensity in September in Pismo Beach?

In Pismo Beach, California, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Pismo Beach, CA

Average temperature in September - Pismo Beach, CA
  • Average high temperature in September: 79.5°F

The warmest month (with the highest average high temperature) is September (79.5°F).
The month with the lowest average high temperature is December (61.2°F).

  • Average low temperature in September: 59.9°F

The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).

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Average pressure in September
Pismo Beach, CA

Average pressure in September - Pismo Beach, 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
Pismo Beach, CA

Average wind speed in September - Pismo Beach, CA
  • Average wind speed in September: 5.8mph

The windiest months (with the highest average wind speed) are April and May (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity in September
Pismo Beach, CA

Average humidity in September - Pismo Beach, CA
  • Average humidity in September: 59%

The month with the highest relative humidity is March (68%).
The month with the lowest relative humidity is October (58%).

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Average rainfall in September
Pismo Beach, CA

Average rainfall in September - Pismo Beach, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is March (1.61").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in September
Pismo Beach, CA

Average rainfall days in September - Pismo Beach, CA
  • Average rainfall days in September: 1.8 days

The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is August (0.8 days).

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Average sea temperature in September
Pismo Beach, CA

Average sea temperature in September - Pismo Beach, CA
  • Average sea temperature in September: 58.3°F

The best months for swimming (with the highest average sea temperature) are August and October (58.6°F).
The coldest month (with the lowest average sea temperature) is April (54.3°F).

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Average daylight in September /
Average sunshine in September
Pismo Beach, CA

Average daylight in September / Average sunshine in September - Pismo Beach, 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: 11.3h

Months with the most sunshine are June, July and August (Average sunshine: 12h).
Months with the least sunshine are February and December (Average sunshine: 6.5).

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Average sunshine days in September
Pismo Beach, CA

Average sunshine days in September - Pismo Beach, CA
  • Average sunshine days in September: 28.2 days

The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is February (21 days).

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Average UV index in September
Pismo Beach, CA

Average UV index in September - Pismo Beach, CA
  • Average UV index in September: 5

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

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Average cloud cover in September
Pismo Beach, CA

Average cloud cover in September - Pismo Beach, CA
  • Average cloud cover in September: 7

The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Pismo Beach, CA

Average visibility in September - Pismo Beach, 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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