September weather forecast
Loma Linda, CA

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Weather in September

The first month of the autumn, September, is also a hot month in Loma Linda, California, with an average temperature fluctuating between 87.4°F (30.8°C) and 63.3°F (17.4°C).

Temperature

Upon the onset of September, Loma Linda witnesses an average high-temperature of a still tropical 87.4°F (30.8°C), showing a close resemblance to the prior month. Loma Linda experiences a significant reduction from daytime highs with an average low-temperature of 63.3°F (17.4°C) in September.

Heat index

The heat index in September is appraised at a hot 87.8°F (31°C). Continued exposure and engagement in activity might trigger tiredness and subsequently heat cramps.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'real feel' or 'feels like', binds temperature metrics with humidity values to give a sense of the actual warmth. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.

Humidity

In September, the average relative humidity is 41%.

Rainfall

In Loma Linda, in September, it is raining for 1.9 days, with typically 0.08" (2mm) of accumulated precipitation. In Loma Linda, during the entire year, the rain falls for 46.6 days and collects up to 6.18" (157mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:14 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:34 pm PDT.

Sunshine

In September, the average sunshine is 10.7h.

UV index

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 6 transforms into these recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. 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. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

Loma Linda in September has an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 63.3°F (17.4°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is appraised at 87.8°F (31°C).

What is the average humidity in September?

The average relative humidity in September in Loma Linda is 41%.

How much does it rain in September?

In September, the rain falls for 1.9 days. Throughout September, 0.08" (2mm) of precipitation is accumulated.

When it does not snow?

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

How many hours of daylight does Loma Linda have in September?

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

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:23 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:34 pm PDT.

How long on average sun shines in September?

In Loma Linda, the average sunshine duration in September is 10.7h.

What is the UV index reading in September?

In Loma Linda, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
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
Loma Linda, CA

Average temperature in September - Loma Linda, CA
  • Average high temperature in September: 87.4°F

The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is December (59.9°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

Average pressure in September
Loma Linda, CA

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in September
Loma Linda, CA

Average wind speed in September - Loma Linda, CA
  • Average wind speed in September: 4.5mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

Average humidity in September
Loma Linda, CA

Average humidity in September - Loma Linda, CA
  • Average humidity in September: 41%

The month with the highest relative humidity is February (53%).
The month with the lowest relative humidity is August (38%).

Average rainfall in September
Loma Linda, CA

Average rainfall in September - Loma Linda, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is December (1.42").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in September
Loma Linda, CA

Average rainfall days in September - Loma Linda, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is March (6.7 days).
The month with the least rainy days is June (1.2 days).

Average snowfall days in September
Loma Linda, CA

Average snowfall days in September - Loma Linda, 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).

Average daylight in September /
Average sunshine in September
Loma Linda, CA

Average daylight in September / Average sunshine in September - Loma Linda, 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: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days in September
Loma Linda, CA

Average sunshine days in September - Loma Linda, CA
  • Average sunshine days in September: 26.7 days

The months with the most sunshine days are June and October (27.9 days).
The month with the least sunshine days is February (21.7 days).

Average UV index in September
Loma Linda, CA

Average UV index in September - Loma Linda, CA
  • Average UV index in September: 6

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

Average cloud cover in September
Loma Linda, CA

Average cloud cover in September - Loma Linda, CA
  • Average cloud cover in September: 6

The months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in September
Loma Linda, CA

Average visibility in September - Loma Linda, 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).

Loma Linda, California, USA

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