September weather forecastPotrero, CA
September
Weather in September
September, the first month of the autumn in Potrero, is also a moderately hot month, with an average temperature fluctuating between 63.9°F (17.7°C) and 84°F (28.9°C).Temperature
Potrero's weather in September indicates an average high-temperature of a moderately hot 84°F (28.9°C), nearly consistent with the 87.4°F (30.8°C) of August. Throughout September, Potrero experiences a low-temperature average of 63.9°F (17.7°C).Heat index
The average heat index in September is appraised at a hot 86°F (30°C). Enduring exposure and continuous activity might cause a feeling of tiredness and induce heat cramps.Given the heat index, its values are aligned with shaded sites and gentle winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is found by incorporating humidity levels into the air temperature measurement. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are primarily vital for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
Humidity
In September, the average relative humidity is 50%.Rainfall
In September, the rain falls for 4.9 days. Throughout September, 0.47" (12mm) of precipitation is accumulated. Throughout the year, there are 55.1 rainfall days, and 6.93" (176mm) of precipitation is accumulated.Snowfall
In Potrero, snow does not fall in January, March through December.Daylight
The average length of the day in September in Potrero, California, is 12h and 22min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:10 pm. On the last day of September, sunrise is at 6:40 am and sunset at 6:31 pm PDT.
Sunshine
The average sunshine in September is 10.4h.UV index
The average daily maximum UV index in September in Potrero is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Potrero, CA
- Average high temperature in September: 84°F
The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is December (61.2°F).
- Average low temperature in September: 63.9°F
The month with the highest average low temperature is August (66.2°F).
The coldest months (with the lowest average low temperature) are February and December (45.1°F).
Average pressure in September
Potrero, CA
- Average pressure in September: 29.86"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Potrero, CA
- Average wind speed in September: 4.7mph
The windiest months (with the highest average wind speed) are February and December (6.4mph).
The calmest months (with the lowest average wind speed) are August and September (4.7mph).
Average humidity in September
Potrero, CA
- Average humidity in September: 50%
The month with the highest relative humidity is May (59%).
The month with the lowest relative humidity is November (48%).
Average rainfall in September
Potrero, CA
- Average rainfall in September: 0.47"
The wettest month (with the highest rainfall) is February (1.3").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Potrero, CA
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is July (7.3 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in September
Potrero, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.12").
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
Potrero, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 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
Potrero, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 24min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in September
Potrero, CA
- Average sunshine days in September: 23 days
The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is July (19.3 days).
Average UV index in September
Potrero, CA
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Potrero, CA
- Average cloud cover in September: 9
The month with the most cloud cover is December (Cloud cover 25).
The month with the least cloud cover is June (Cloud cover 6).
Average visibility in September
Potrero, 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).
