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 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 average high-temperature is a still warm 83.3°F (28.5°C), maintaining a close comparison with August's 85.5°F (29.7°C). Atascadero reports a sharp reduction in temperature during September, averaging at a moderate 59.9°F (15.5°C) at night.Heat index
The heat index in September is calculated to be 84.2°F (29°C). Uninterrupted exposure and activity might result in fatigue, potentially causing heat cramps.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', comes about by integrating the temperature readings with the humidity levels. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Humidity
September is the least humid month, with an average relative humidity of 50%.Rainfall
In Atascadero, during September, the rain falls for 1.8 days and regularly aggregates up to 0.12" (3mm) of precipitation. In Atascadero, during the entire year, the rain falls for 54.8 days and collects up to 8.66" (220mm) of precipitation.Daylight
In Atascadero, the average length of the day in September is 12h and 23min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:47 pm PDT.
Sunshine
In September, the average sunshine in Atascadero is 11.3h.UV index
The months with the highest UV index in Atascadero are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Frequently asked questions
How hot is it in Atascadero in September?
What is the least humid month in Atascadero?
What is the average humidity in September in Atascadero?
How many days does it rain in September in Atascadero?
What is the average length of the day in September in Atascadero?
What time are sunrise and sunset in September in Atascadero?
How many hours of sunshine does Atascadero have in September?
What are the months with the highest UV index in Atascadero?
What is the UV index intensity in September in Atascadero?
Average temperature in September
Atascadero, CA
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is December (58.5°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is December (42.8°F).
Average pressure in September
Atascadero, CA
- Average pressure in September: 29.91"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).
Average wind speed in September
Atascadero, CA
- Average wind speed in September: 4.5mph
The windiest months (with the highest average wind speed) are March and April (5.9mph).
The calmest months (with the lowest average wind speed) are August and September (4.5mph).
Average humidity in September
Atascadero, CA
- Average humidity in September: 50%
The months with the highest relative humidity are February and March (68%).
The month with the lowest relative humidity is September (50%).
Average rainfall in September
Atascadero, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (1.73").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
Atascadero, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is June (0.8 days).
Average daylight in September /
Average sunshine in September
Atascadero, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 11h and 2min
The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 6h and 18min).
Average sunshine days in September
Atascadero, CA
- Average sunshine days in September: 28 days
The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is February (19.7 days).
Average UV index in September
Atascadero, 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 February, November and December (UV index 3).
Average cloud cover in September
Atascadero, CA
- Average cloud cover in September: 7
The month with the most cloud cover is March (Cloud cover 31).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in September
Atascadero, 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).
Atascadero, California, USA
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