September weather forecast
Castroville, CA

Share

Weather in September

September, the first month of the autumn in Castroville, is still a warm month, with an average temperature fluctuating between 76.5°F (24.7°C) and 54.5°F (12.5°C).

Temperature

Castroville records a slight change with September's average high-temperatures adjusting to a still warm 76.5°F (24.7°C) from August's 76.6°F (24.8°C). A pronounced dip becomes evident during the nights in September as Castroville logs a consistent average temperature of 54.5°F (12.5°C).

Humidity

In September, the average relative humidity in Castroville is 67%.

Rainfall

June through September are months with the least rain in Castroville when the rain falls for 2.1 days and typically aggregates up to 0.04" (1mm) of rain.

Daylight

In September, the average length of the day is 12h and 24min.
On the first day of September in Castroville, 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

The average sunshine in September in Castroville, California, is 11.2h.

UV index

June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A daily maximum UV index of 5 in September translates into the following instructions:
Exercise prevention - Precautions against solar damage are endorsed. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
[Resources]

Frequently asked questions

What is the average September temperature in Castroville?

In Castroville, in September, the average high-temperature is 76.5°F (24.7°C), and the average low-temperature is 54.5°F (12.5°C).

What is the average humidity in September in Castroville?

The average relative humidity in September is 67%.

What is the driest month in Castroville?

June through September are months with the least rain when the rain falls for 2.1 days and typically aggregates up to 0.04" (1mm) of rain.

How many days does it rain in September in Castroville?

In Castroville, California, in September, it is raining for 2.1 days, with typically 0.04" (1mm) of accumulated precipitation.

How many hours of daylight does Castroville have in September?

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

When are sunrise and sunset in September in Castroville?

On the first day of September in Castroville, 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 Castroville?

In Castroville, the average sunshine duration in September is 11.2h.

What are the months with the highest UV index in Castroville?

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

How high is the UV index in September in Castroville?

In Castroville, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability 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
Castroville, CA

Average temperature in September - Castroville, CA
  • Average high temperature in September: 76.5°F

The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (57.6°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is September (54.5°F).
The coldest month (with the lowest average low temperature) is December (43.7°F).

[Resources]

Average pressure in September
Castroville, CA

Average pressure in September - Castroville, 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).

[Resources]

Average wind speed in September
Castroville, CA

Average wind speed in September - Castroville, CA
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is May (6.5mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).

[Resources]

Average humidity in September
Castroville, CA

Average humidity in September - Castroville, CA
  • Average humidity in September: 67%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (66%).

[Resources]

Average rainfall in September
Castroville, CA

Average rainfall in September - Castroville, CA
  • Average rainfall in September: 0.04"

The wettest month (with the highest rainfall) is December (1.14").
The driest months (with the least rainfall) are June, July, August and September (0.04").

[Resources]

Average rainfall days in September
Castroville, CA

Average rainfall days in September - Castroville, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.7 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11h and 1min

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).

[Resources]

Average sunshine days in September
Castroville, CA

Average sunshine days in September - Castroville, CA
  • Average sunshine days in September: 27.3 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (20 days).

[Resources]

Average UV index in September
Castroville, CA

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

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

[Resources]

Average cloud cover in September
Castroville, CA

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

The month with the most cloud cover is March (Cloud cover 33).
The months with the least cloud cover are July and September (Cloud cover 10).

[Resources]

Average visibility in September
Castroville, CA

Average visibility in September - Castroville, 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).

[Resources]

Castroville, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location