September weather forecast and climate
Lake Nacimiento, CA

Weather in September

September, the first month of the autumn, in Lake Nacimiento, is also a moderately hot month, with average temperature ranging between max 84.2°F (29°C) and min 60.1°F (15.6°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 84.2°F (29°C). The average low-temperature, in Lake Nacimiento, is 60.1°F (15.6°C).

Heat index

In September, the average heat index is estimated at 84.7°F (29.3°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, wind). 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 especially crucial for babies and toddlers. 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

September is the least humid month in Lake Nacimiento, with an average relative humidity of 47%.

Rainfall

In September, the rain falls for 1.5 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. In Lake Nacimiento, during the entire year, the rain falls for 55.2 days and collects up to 9.06" (230mm) of precipitation.

Daylight

The average length of the day is 12.4h.

Sunshine

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 Lake Nacimiento, California. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Lake Nacimiento?

The average high-temperature, in September, in Lake Nacimiento, California, is 84.2°F (29°C), while the average low-temperature is 60.1°F (15.6°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), that combines relative humidity and air temperature, is appraised at 84.7°F (29.3°C).

What is the least humid month in Lake Nacimiento?

September is the least humid month, with an average relative humidity of 47%.

What is the average humidity in September in Lake Nacimiento?

In September, the average relative humidity in Lake Nacimiento, California, is 47%.

How many days does it rain in September in Lake Nacimiento?

In Lake Nacimiento, California, during September, the rain falls for 1.5 days and regularly aggregates up to 0.08" (2mm) of precipitation.

How many hours of daylight does Lake Nacimiento have in September?

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

How many hours of sunshine does Lake Nacimiento have in September?

The average sunshine in September is 11.4h.

When is the highest UV index in Lake Nacimiento?

Months with the highest UV index in Lake Nacimiento are June through September, with an average maximum UV index of 6.

What is the UV index reading in September in Lake Nacimiento?

In September, the average daily maximum UV index in Lake Nacimiento is 6. A UV Index reading of 6 to 7 represents a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Lake Nacimiento, CA

Average temperature in September - Lake Nacimiento, CA
  • Average high temperature in September: 84.2°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (58.1°F).

  • Average low temperature in September: 60.1°F

The month with the highest average low temperature is August (60.8°F).
The coldest months (with the lowest average low temperature) are February and December (42.8°F).

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Average pressure in September
Lake Nacimiento, CA

Average pressure in September - Lake Nacimiento, CA
  • Average pressure in September: 29.91"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June and September (29.91").

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Average wind speed in September
Lake Nacimiento, CA

Average wind speed in September - Lake Nacimiento, CA
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is May (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in September
Lake Nacimiento, CA

Average humidity in September - Lake Nacimiento, CA
  • Average humidity in September: 47%

The month with the highest relative humidity is February (68%).
The month with the lowest relative humidity is September (47%).

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Average rainfall in September
Lake Nacimiento, CA

Average rainfall in September - Lake Nacimiento, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is January (1.77").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in September
Lake Nacimiento, CA

Average rainfall days in September - Lake Nacimiento, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (10.5 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
Lake Nacimiento, CA

Average daylight in September / Average sunshine in September - Lake Nacimiento, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.6h).
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 and July (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.4).

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Average sunshine days in September
Lake Nacimiento, CA

Average sunshine days in September - Lake Nacimiento, CA
  • Average sunshine days in September: 27.8 days

The month with the most sunshine days is August (29 days).
The month with the least sunshine days is February (19.8 days).

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Average UV index in September
Lake Nacimiento, CA

Average UV index in September - Lake Nacimiento, 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
Lake Nacimiento, CA

Average cloud cover in September - Lake Nacimiento, CA
  • Average cloud cover in September: 5

The month with the most cloud cover is March (Cloud cover 29).
Months with the least cloud cover are July, August and September (Cloud cover 5).

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Average visibility in September
Lake Nacimiento, CA

Average visibility in September - Lake Nacimiento, 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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