September weather forecast
Plymouth, CA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Plymouth, California, with an average temperature varying between 57°F (13.9°C) and 85.1°F (29.5°C).

Temperature

The commencement of September records an average high-temperature of a moderately hot 85.1°F (29.5°C), barely varying from August's 90.1°F (32.3°C). Plymouth, amid September nights, sees a noteworthy disparity from daily highs with an average temperature of 57°F (13.9°C).

Heat index

In September, the heat index is estimated at 84.2°F (29°C). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.
Understand that the heat index values take into account shaded locations and mild winds. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.

Humidity

In September, the average relative humidity is 42%.

Rainfall

In September, in Plymouth, the rain falls for 3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Plymouth, during the entire year, the rain falls for 81.8 days and collects up to 23.39" (594mm) of precipitation.

Snowfall

January, April through October are months without snowfall.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September in Plymouth, sunrise is at 6:33 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:47 pm PDT.

Sunshine

The average sunshine in September is 11.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
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Frequently asked questions

Is it hot in Plymouth during September?

In Plymouth, in September, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 57°F (13.9°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, is estimated at 84.2°F (29°C).

What is the average humidity in September in Plymouth?

In Plymouth, California, the average relative humidity in September is 42%.

How many days does it rain in September in Plymouth?

In Plymouth, California, in September, it is raining for 3 days, with typically 0.24" (6mm) of accumulated precipitation.

When it does not snow in Plymouth?

January, April through October are months without snowfall in Plymouth.

What is the average length of the day in September in Plymouth?

In Plymouth, California, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Plymouth?

In September, on the first day of the month, sunrise is at 6:33 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:47 pm PDT.

How many hours of sunshine does Plymouth have in September?

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

What is the UV index intensity in September in Plymouth?

In September, the average daily maximum UV index in Plymouth, California, is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Plymouth, CA

Average temperature in September - Plymouth, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).

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Average pressure in September
Plymouth, CA

Average pressure in September - Plymouth, CA
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Plymouth, CA

Average wind speed in September - Plymouth, CA
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in September
Plymouth, CA

Average humidity in September - Plymouth, CA
  • Average humidity in September: 42%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).

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Average rainfall in September
Plymouth, CA

Average rainfall in September - Plymouth, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is March (4.69").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Plymouth, CA

Average rainfall days in September - Plymouth, CA
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (1.5 days).

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Average snowfall in September
Plymouth, CA

Average snowfall in September - Plymouth, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are January, April, May, June, July, August, September and October (0").

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Average snowfall days in September
Plymouth, CA

Average snowfall days in September - Plymouth, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 11h and 2min

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

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Average sunshine days in September
Plymouth, CA

Average sunshine days in September - Plymouth, CA
  • Average sunshine days in September: 26.5 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (15.1 days).

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Average UV index in September
Plymouth, CA

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Plymouth, CA

Average cloud cover in September - Plymouth, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Plymouth, CA

Average visibility in September - Plymouth, 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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Plymouth, California, USA

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