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
The initiation of September records an average high-temperature of a warm 84.7°F (29.3°C), displaying a near consistency with the previous month. San Marino witnesses an average low-temperature of 63.5°F (17.5°C) throughout the month of September.Heat index
The average heat index in September is evaluated at a tropical 86°F (30°C). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.Metrics for the heat index primarily focus on shaded spots and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are largely significant for babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
Humidity
In San Marino, the average relative humidity in September is 51%.Rainfall
In San Marino, during September, the rain falls for 2.8 days and regularly aggregates up to 0.16" (4mm) of precipitation. Throughout the year, in San Marino, California, there are 45 rainfall days, and 6.61" (168mm) of precipitation is accumulated.Daylight
The average length of the day in September in San Marino is 12h and 22min.On the first day of September, sunrise is at 6:26 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:37 pm PDT.
Sunshine
In September, the average sunshine is 10.7h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index in San Marino, California. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
How hot is September in San Marino?
What is the average humidity in September in San Marino?
How much does it rain in San Marino in September?
What is the average length of the day in September in San Marino?
When are sunrise and sunset in September in San Marino?
How long on average sun shines in September in San Marino?
What are the months with the highest UV index in San Marino?
What is the UV index reading in September in San Marino?
Average temperature in September
San Marino, CA
- Average high temperature in September: 84.7°F
The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (63.1°F).
- Average low temperature in September: 63.5°F
The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is February (47.1°F).
Average pressure in September
San Marino, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
San Marino, CA
- Average wind speed in September: 4.4mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in September
San Marino, CA
- Average humidity in September: 51%
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).
Average rainfall in September
San Marino, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is December (1.34").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
San Marino, CA
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is March (5.8 days).
The month with the least rainy days is June (1.2 days).
Average daylight in September /
Average sunshine in September
San Marino, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in September
San Marino, CA
- Average sunshine days in September: 25 days
The month with the most sunshine days is June (27.1 days).
The month with the least sunshine days is February (22.3 days).
Average UV index in September
San Marino, 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 January, February, November and December (UV index 4).
Average cloud cover in September
San Marino, CA
- Average cloud cover in September: 7
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
San Marino, 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 Marino, California, USA
Weather forecast for your location
2. Allow the app to use your location
