Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift into September finds Reilly Heights at an average high-temperature of a still moderately hot 80.8°F (27.1°C), closely comparable to August's conditions. Contrasting the daytime warmth, Reilly Heights's September nights cool down to an average of 51.4°F (10.8°C).Heat index
The heat index value for September is computed to be 82.4°F (28°C). Persistent activity under exposure might lead to a feeling of weariness, with subsequent heat cramps.It is noted that heat index values are ascertained for locations in the shade and with gentle breezes. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
Humidity
July and September, with an average relative humidity of 58%, are the least humid months in Reilly Heights.Rainfall
In September, in Reilly Heights, the rain falls for 2.5 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. In Reilly Heights, during the entire year, the rain falls for 83.3 days and collects up to 17.72" (450mm) of precipitation.Snowfall
In Reilly Heights, snow does not fall in January, March through December.Daylight
In Reilly Heights, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:44 pm. On the last day of September, in Reilly Heights, sunrise is at 7:09 am and sunset at 6:57 pm PDT.
Sunshine
The average sunshine in September is 10.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Frequently asked questions
What is the average September temperature in Reilly Heights?
What are the least humid months in Reilly Heights?
What is the average humidity in September in Reilly Heights?
How much does it rain in Reilly Heights in September?
When it does not snow in Reilly Heights?
How many hours of daylight does Reilly Heights have in September?
When is the sunrise / sunset in September in Reilly Heights?
How many hours of sunshine does Reilly Heights have in September?
What is the UV index reading in September in Reilly Heights?
Average temperature in September
Reilly Heights, CA
- Average high temperature in September: 80.8°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (53.6°F).
- Average low temperature in September: 51.4°F
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is December (37.4°F).
Average pressure in September
Reilly Heights, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Reilly Heights, CA
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are April, May and June (5.5mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).
Average humidity in September
Reilly Heights, CA
- Average humidity in September: 58%
The month with the highest relative humidity is March (79%).
The months with the lowest relative humidity are July and September (58%).
Average rainfall in September
Reilly Heights, CA
- Average rainfall in September: 0.2"
The wettest months (with the highest rainfall) are February and December (3.11").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Reilly Heights, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is August (1.3 days).
Average snowfall in September
Reilly Heights, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Reilly Heights, 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, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Reilly Heights, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Reilly Heights, CA
- Average sunshine days in September: 26.9 days
The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (15.9 days).
Average UV index in September
Reilly Heights, CA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are February and November (UV index 2).
Average cloud cover in September
Reilly Heights, CA
- Average cloud cover in September: 11
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Reilly Heights, CA
- Average visibility in September: 6mi
The months with the highest visibility are February, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March and December (5mi).
Reilly Heights, California, USA
Weather forecast for your location
2. Allow the app to use your location
