September weather forecast
San Jacinto, CA

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Weather in September

September, the first month of the autumn in San Jacinto, is also a moderately hot month, with an average temperature varying between 61°F (16.1°C) and 85.5°F (29.7°C).

Temperature

In September, San Jacinto's weather conditions record an average high-temperature of a moderately hot 85.5°F (29.7°C), demonstrating little divergence from the preceding month. San Jacinto's temperature in September declines substantially from daytime highs, settling at a consistent average of 61°F (16.1°C) during the nights.

Heat index

In September, the average heat index is appraised at a hot 86°F (30°C). With unrelenting exposure and activity, one might experience exhaustion, leading to potential heat cramps.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. 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 'apparent temperature' or 'real feel', reflects the feeling of heat when considering both air temperature and humidity. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.

Humidity

In San Jacinto, the average relative humidity in September is 44%.

Rainfall

In September, in San Jacinto, the rain falls for 2.9 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. Throughout the year, in San Jacinto, there are 54 rainfall days, and 6.61" (168mm) of precipitation is accumulated.

Snowfall

January through November are months without snowfall in San Jacinto.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of September, sunrise is at 6:42 am and sunset at 6:32 pm PDT.

Sunshine

In September, the average sunshine in San Jacinto is 10.5h.

UV index

In September, the average daily maximum UV index in San Jacinto is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

How hot does it get in San Jacinto in September?

The high-temperature, in September, in San Jacinto, is 85.5°F (29.7°C), while the low-temperature averages to 61°F (16.1°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is appraised at 86°F (30°C).

What is the average humidity in September in San Jacinto?

In San Jacinto, the average relative humidity in September is 44%.

How much does it rain in San Jacinto in September?

In San Jacinto, during September, the rain falls for 2.9 days and regularly aggregates up to 0.16" (4mm) of precipitation.

When it does not snow in San Jacinto?

January through November are months without snowfall.

What is the average length of the day in September in San Jacinto?

In San Jacinto, California, the average day length in September is 12h and 22min.

What time are sunrise and sunset in September in San Jacinto?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of the month, in San Jacinto, sunrise is at 6:42 am and sunset at 6:32 pm PDT.

How long on average sun shines in September in San Jacinto?

In September, the average sunshine duration in San Jacinto, California, is 10.5h.

How high is the UV index in September in San Jacinto?

In San Jacinto, California, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
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
San Jacinto, CA

Average temperature in September - San Jacinto, CA
  • Average high temperature in September: 85.5°F

The warmest month (with the highest average high temperature) is August (90.5°F).
The month with the lowest average high temperature is December (58.6°F).

  • Average low temperature in September: 61°F

The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (41°F).

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Average pressure in September
San Jacinto, CA

Average pressure in September - San Jacinto, CA
  • Average pressure in September: 29.86"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in September
San Jacinto, CA

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

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).

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Average humidity in September
San Jacinto, CA

Average humidity in September - San Jacinto, CA
  • Average humidity in September: 44%

The months with the highest relative humidity are February, March and May (56%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in September
San Jacinto, CA

Average rainfall in September - San Jacinto, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (1.38").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
San Jacinto, CA

Average rainfall days in September - San Jacinto, CA
  • Average rainfall days in September: 2.9 days

The month with the highest number of rainy days is March (7.4 days).
The month with the least rainy days is June (1.6 days).

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Average snowfall in September
San Jacinto, CA

Average snowfall in September - San Jacinto, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
San Jacinto, CA

Average snowfall days in September - San Jacinto, CA
  • Average snowfall days in September: 0 days

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

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Average daylight in September /
Average sunshine in September
San Jacinto, CA

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 3min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 42min).

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Average sunshine days in September
San Jacinto, CA

Average sunshine days in September - San Jacinto, CA
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is October (27.4 days).
The month with the least sunshine days is February (20.9 days).

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Average UV index in September
San Jacinto, CA

Average UV index in September - San Jacinto, CA
  • Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
San Jacinto, CA

Average cloud cover in September - San Jacinto, CA
  • Average cloud cover in September: 8

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

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Average visibility in September
San Jacinto, CA

Average visibility in September - San Jacinto, 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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San Jacinto, California, USA

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