September weather forecast
Watsonville, CA

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Weather in September

September, the first month of the autumn in Watsonville, is also a moderately hot month, with temperature in the range of an average low of 54.9°F (12.7°C) and an average high of 77.9°F (25.5°C).

Temperature

Watsonville, California, marks the onset of September with an average high-temperature of a still warm 77.9°F (25.5°C), a subtle shift from August's 78.1°F (25.6°C). Watsonville sees a large disparity in day to night temperatures in September, with the night temperature dropping to an average of 54.9°F (12.7°C).

Humidity

September and October, with an average relative humidity of 65%, are the least humid months in Watsonville.

Rainfall

In September, in Watsonville, the rain falls for 2.5 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 68.3 rainfall days, and 11.38" (289mm) of precipitation is accumulated.

Daylight

In September, the average length of the day in Watsonville is 12h and 24min.
On the first day of September in Watsonville, California, sunrise is at 6:38 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

Sunshine

In Watsonville, the average sunshine in September is 11.3h.

UV index

April, June through September, with an average maximum UV index of 5, are months with the highest UV index in Watsonville. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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Frequently asked questions

What is the average September temperature in Watsonville?

The average high-temperature and low-temperature during September are 77.9°F (25.5°C) and 54.9°F (12.7°C) respectively.

What are the least humid months in Watsonville?

The months with the lowest humidity in Watsonville, California, are September and October, with an average relative humidity of 65%.

What is the average humidity in September in Watsonville?

In Watsonville, the average relative humidity in September is 65%.

How many days does it rain in September in Watsonville?

In September, in Watsonville, California, the rain falls for 2.5 days. Throughout September, 0.08" (2mm) of precipitation is accumulated.

How many hours of daylight does Watsonville have in September?

The average day length in September in Watsonville is 12h and 24min.

What time are sunrise and sunset in September in Watsonville?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

How long on average sun shines in September in Watsonville?

In Watsonville, the average sunshine duration in September is 11.3h.

What is the month with the highest UV index in Watsonville?

April, June through September, with an average maximum UV index of 5, are months with the highest UV index in Watsonville.

How high is the UV index in September in Watsonville?

In Watsonville, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Watsonville, CA

Average temperature in September - Watsonville, CA
  • Average high temperature in September: 77.9°F

The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is December (57.9°F).

  • Average low temperature in September: 54.9°F

The month with the highest average low temperature is September (54.9°F).
The coldest month (with the lowest average low temperature) is February (43.3°F).

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Average pressure in September
Watsonville, CA

Average pressure in September - Watsonville, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

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Average wind speed in September
Watsonville, CA

Average wind speed in September - Watsonville, CA
  • Average wind speed in September: 4.7mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest months (with the lowest average wind speed) are January, August, September, October and November (4.7mph).

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Average humidity in September
Watsonville, CA

Average humidity in September - Watsonville, CA
  • Average humidity in September: 65%

The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (65%).

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Average rainfall in September
Watsonville, CA

Average rainfall in September - Watsonville, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (2.13").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Watsonville, CA

Average rainfall days in September - Watsonville, CA
  • Average rainfall days in September: 2.5 days

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).

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Average daylight in September /
Average sunshine in September
Watsonville, CA

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11h and 2min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Watsonville, CA

Average sunshine days in September - Watsonville, CA
  • Average sunshine days in September: 27 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is March (17.6 days).

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Average UV index in September
Watsonville, CA

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

The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in September
Watsonville, CA

Average cloud cover in September - Watsonville, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in September
Watsonville, CA

Average visibility in September - Watsonville, 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).

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Watsonville, California, USA

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