September weather forecastLa Cresta, CA
September
Weather in September
September, the first month of the autumn in La Cresta, is still a warm month, with temperature in the range of an average low of 61.5°F (16.4°C) and an average high of 85.3°F (29.6°C).Temperature
Entering September, La Cresta's average high-temperature reads a moderately hot 85.3°F (29.6°C), indicating a close resemblance to the previous month's climate. La Cresta's nighttime temperatures in September reflect a stark contrast to the day's highs, falling to an average low of 61.5°F (16.4°C).Heat index
September's heat index is estimated at a tropical 87.8°F (31°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.Records show heat index calculations are tailored for shaded regions and mild winds. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
The average relative humidity in September is 51%.Rainfall
In La Cresta, during September, the rain falls for 4.1 days and regularly aggregates up to 0.24" (6mm) of precipitation. Throughout the year, there are 64.9 rainfall days, and 9.8" (249mm) of precipitation is accumulated.Snowfall
January, March through November are months without snowfall.Daylight
The average length of the day in September is 12h and 22min.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.
Sunshine
In La Cresta, the average sunshine in September is 10.5h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 6 translates into these guidelines:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
La Cresta, CA
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is December (61.2°F).
- Average low temperature in September: 61.5°F
The month with the highest average low temperature is August (63.7°F).
The coldest month (with the lowest average low temperature) is December (43.2°F).
Average pressure in September
La Cresta, 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).
Average wind speed in September
La Cresta, CA
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (5.4mph).
The calmest months (with the lowest average wind speed) are August and September (4.2mph).
Average humidity in September
La Cresta, CA
- Average humidity in September: 51%
The month with the highest relative humidity is May (62%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
La Cresta, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is February (1.89").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
La Cresta, CA
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is June (1.7 days).
Average snowfall in September
La Cresta, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.2").
The months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
La Cresta, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
La Cresta, CA
- Average daylight in September: 12h and 24min
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 30min
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 36min).
Average sunshine days in September
La Cresta, CA
- Average sunshine days in September: 22.6 days
The month with the most sunshine days is June (26.3 days).
The month with the least sunshine days is February (20.7 days).
Average UV index in September
La Cresta, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are November and December (UV index 3).
Average cloud cover in September
La Cresta, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
La Cresta, 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).
