September weather forecast
Lilac, CA

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Weather in September

September, the first month of the autumn in Lilac, is also a moderately hot month, with an average temperature ranging between max 84.4°F (29.1°C) and min 61.7°F (16.5°C).

Temperature

The advent of September brings an average high-temperature of a warm 84.4°F (29.1°C), exhibiting minor difference from the previous month. Lilac's average nighttime temperature descends significantly from the day's peak in September, settling at a refreshing 61.7°F (16.5°C).

Heat index

In September, the heat index is appraised at a hot 87.8°F (31°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.
Heat index determinations are made taking into account the shade and light air movements. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly important for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

The average relative humidity in September in Lilac is 56%.

Rainfall

In Lilac, California, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Lilac, during the entire year, the rain falls for 51.6 days and collects up to 5.59" (142mm) of precipitation.

Snowfall

In Lilac, snow does not fall in January, March through December.

Daylight

In Lilac, the average length of the day in September is 12h and 22min.
On the first day of September in Lilac, sunrise is at 6:23 am and sunset at 7:13 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:33 pm PDT.

Sunshine

The average sunshine in September in Lilac, California, is 10.5h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Lilac. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 6 in September converts into the following recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

Is it hot in Lilac during September?

In Lilac, 84.4°F (29.1°C) is the average high-temperature and 61.7°F (16.5°C) is the average low-temperature during September. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is appraised at 87.8°F (31°C).

What is the average humidity in September in Lilac?

In September, the average relative humidity is 56%.

How much does it rain in Lilac in September?

In Lilac, California, during September, the rain falls for 3.9 days and regularly aggregates up to 0.24" (6mm) of precipitation.

When it does not snow in Lilac?

In Lilac, California, snow does not fall in January, March through December.

How many hours of daylight does Lilac have in September?

In Lilac, the average day length in September is 12h and 22min.

When are sunrise and sunset in September in Lilac?

In September, on the first day of the month, sunrise is at 6:23 am and sunset at 7:13 pm. On the last day of the month, in Lilac, sunrise is at 6:42 am and sunset at 6:33 pm PDT.

How many hours of sunshine does Lilac have in September?

In Lilac, the average sunshine duration in September is 10.5h.

When is the highest UV index in Lilac?

June through September, with an average maximum UV index of 6, are months with the highest UV index in Lilac, California.

How high is the UV index in September in Lilac?

The average daily maximum UV index in September in Lilac is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Lilac, CA

Average temperature in September - Lilac, CA
  • Average high temperature in September: 84.4°F

The warmest month (with the highest average high temperature) is August (86.9°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is February (44.6°F).

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Average pressure in September
Lilac, CA

Average pressure in September - Lilac, CA
  • Average pressure in September: 29.87"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Lilac, CA

Average wind speed in September - Lilac, CA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is April (5.3mph).
The calmest month (with the lowest average wind speed) is September (4.2mph).

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Average humidity in September
Lilac, CA

Average humidity in September - Lilac, CA
  • Average humidity in September: 56%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in September
Lilac, CA

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

The wettest month (with the highest rainfall) is February (0.94").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Lilac, CA

Average rainfall days in September - Lilac, CA
  • Average rainfall days in September: 3.9 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall days in September
Lilac, CA

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

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 3min

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 42min).

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Average sunshine days in September
Lilac, CA

Average sunshine days in September - Lilac, CA
  • Average sunshine days in September: 24.8 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in September
Lilac, CA

Average UV index in September - Lilac, CA
  • Average UV index in September: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Lilac, CA

Average cloud cover in September - Lilac, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Lilac, CA

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

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