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 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
September's arrival aligns with a minor decrease in average high-temperatures, from August's 94.6°F (34.8°C) to a still hot 88.9°F (31.6°C). Rio Oso, in September, experiences a marked contrast from daytime zeniths to a steady average low-temperature of 59°F (15°C).Heat index
September's heat index is calculated to be a hot 89.6°F (32°C). If exposure and activity are sustained, they might cause a feeling of weariness, resulting in heat cramps.When referencing the heat index, its values are suitable for shady environments and light breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'feels like', determines the feeling of heat when you account for the relative humidity. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
Humidity
In Rio Oso, the average relative humidity in September is 40%.Rainfall
In Rio Oso, California, in September, during 2.2 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 78.2 rainfall days, and 20.43" (519mm) of precipitation is accumulated.Snowfall
January through November are months without snowfall.Daylight
The average length of the day in September in Rio Oso is 12h and 25min.On the first day of September, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm PDT.
Sunshine
In Rio Oso, the average sunshine in September is 11.1h.UV index
In September, the average daily maximum UV index in Rio Oso is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
Is it hot in Rio Oso during September?
What is the average humidity in September in Rio Oso?
How much does it rain in Rio Oso in September?
When it does not snow in Rio Oso?
How many hours of daylight does Rio Oso have in September?
What time are sunrise and sunset in September in Rio Oso?
How many hours of sunshine does Rio Oso have in September?
What is the UV index intensity in September in Rio Oso?
Average temperature in September
Rio Oso, CA
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is July (95.4°F).
The month with the lowest average high temperature is December (54.3°F).
- Average low temperature in September: 59°F
The month with the highest average low temperature is July (61.3°F).
The coldest months (with the lowest average low temperature) are January and December (40.6°F).
Average pressure in September
Rio Oso, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Rio Oso, CA
- Average wind speed in September: 5mph
The windiest months (with the highest average wind speed) are March and May (6.2mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).
Average humidity in September
Rio Oso, CA
- Average humidity in September: 40%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (39%).
Average rainfall in September
Rio Oso, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is March (3.9").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Rio Oso, CA
- Average rainfall days in September: 2.2 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1 days).
Average snowfall days in September
Rio Oso, 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).
Average daylight in September /
Average sunshine in September
Rio Oso, 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: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in September
Rio Oso, CA
- Average sunshine days in September: 26.9 days
The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (16.1 days).
Average UV index in September
Rio Oso, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Rio Oso, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Rio Oso, 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).
Rio Oso, California, USA
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