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
As San Luis Obispo welcomes September, the average high-temperature is noted at a still warm 79.9°F (26.6°C), closely aligning with the preceding month. During the nights in September, San Luis Obispo experiences a consistent average temperature of 60.3°F (15.7°C).Humidity
September and October, with an average relative humidity of 57%, are the least humid months in San Luis Obispo.Rainfall
In San Luis Obispo, during September, the rain falls for 1.8 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, in San Luis Obispo, there are 57 rainfall days, and 9.57" (243mm) of precipitation is accumulated.Daylight
The average length of the day in September in San Luis Obispo is 12h and 23min.On the first day of September in San Luis Obispo, sunrise is at 6:35 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:47 pm PDT.
Sunshine
In September, the average sunshine is 11.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 5 suggests these recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
What is the average September temperature in San Luis Obispo?
What are the least humid months in San Luis Obispo?
What is the average humidity in September in San Luis Obispo?
How many days does it rain in September in San Luis Obispo?
What is the average length of the day in September in San Luis Obispo?
When is the sunrise / sunset in September in San Luis Obispo?
How many hours of sunshine does San Luis Obispo have in September?
What is the UV index intensity in September in San Luis Obispo?
Average temperature in September
San Luis Obispo, CA
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (60.3°F).
- Average low temperature in September: 60.3°F
The month with the highest average low temperature is September (60.3°F).
The coldest month (with the lowest average low temperature) is February (45.7°F).
Average pressure in September
San Luis Obispo, 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
San Luis Obispo, CA
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are April and May (6.8mph).
The calmest months (with the lowest average wind speed) are August and September (5.3mph).
Average humidity in September
San Luis Obispo, CA
- Average humidity in September: 57%
The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are September and October (57%).
Average rainfall in September
San Luis Obispo, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (2.01").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
San Luis Obispo, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.6 days).
Average daylight in September /
Average sunshine in September
San Luis Obispo, 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, July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 6h and 30min).
Average sunshine days in September
San Luis Obispo, CA
- Average sunshine days in September: 27.9 days
The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is February (19.1 days).
Average UV index in September
San Luis Obispo, CA
- Average UV index in September: 5
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is February (UV index 3).
Average cloud cover in September
San Luis Obispo, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 28).
The months with the least cloud cover are August and September (Cloud cover 6).
Average visibility in September
San Luis Obispo, 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).
San Luis Obispo, California, USA
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