September weather forecastLa Verne, CA
September
Weather in September
The first month of the autumn, September, is still a hot month in La Verne, California, with an average temperature varying between 86.9°F (30.5°C) and 63.5°F (17.5°C).Temperature
At the start of September, La Verne's average high-temperature reaches a still hot 86.9°F (30.5°C), subtly different from the preceding month. La Verne experiences a consistent, yet significant, drop from daily highs to a low-temperature of 63.5°F (17.5°C) throughout September.Heat index
The heat index in September is appraised at a tropical 87.8°F (31°C). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.Records show heat index calculations are tailored for shaded regions and mild winds. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'real feel' or 'feels like', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. 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 highly critical to babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
The average relative humidity in September is 46%.Rainfall
In September, the rain falls for 2.1 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 42.4 rainfall days, and 4.72" (120mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:16 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:36 pm PDT.
Sunshine
In September, the average sunshine is 10.8h.UV index
In La Verne, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 6 in September transforms into this advice:
Resist extreme sun exposure. Guarding against solar damage is essential. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
La Verne, CA
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is August (89.8°F).
The month with the lowest average high temperature is December (62.4°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure in September
La Verne, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
La Verne, CA
- Average wind speed in September: 4.3mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).
Average humidity in September
La Verne, CA
- Average humidity in September: 46%
The months with the highest relative humidity are March and May (55%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall in September
La Verne, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (1.02").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
La Verne, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (6.1 days).
The month with the least rainy days is June (1 days).
Average snowfall days in September
La Verne, 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
La Verne, CA
- Average daylight in September: 12h and 24min
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 48min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in September
La Verne, CA
- Average sunshine days in September: 25.7 days
The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (22.8 days).
Average UV index in September
La Verne, CA
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
La Verne, CA
- Average cloud cover in September: 6
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
La Verne, 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).
