September weather forecastPalermo, CA
September
Weather in September
September, the first month of the autumn in Palermo, is still a hot month, with temperature in the range of an average high of 88.9°F (31.6°C) and an average low of 61°F (16.1°C).Temperature
The shift from August to September includes a small decrease in the average high-temperature, from a tropical 94.6°F (34.8°C) to a still hot 88.9°F (31.6°C). In September, the temperature in Palermo, California, sees a substantial plunge from daytime highs to a low average of 61°F (16.1°C).Humidity
The average relative humidity in September in Palermo is 34%.Rainfall
In September, in Palermo, the rain falls for 2.3 days. Throughout September, 0.31" (8mm) of precipitation is accumulated. In Palermo, during the entire year, the rain falls for 80.4 days and collects up to 24.21" (615mm) of precipitation.Snowfall
In Palermo, snow does not fall in January through November.Daylight
The average length of the day in September in Palermo is 12h and 26min.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 7:02 am and sunset at 6:49 pm PDT.
Sunshine
In September, the average sunshine in Palermo, California, is 11.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 5 during September leads to these advisories:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Palermo, CA
- Average high temperature in September: 88.9°F
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in September: 61°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is December (40.6°F).
Average pressure in September
Palermo, 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
Palermo, CA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is March (6.3mph).
The calmest months (with the lowest average wind speed) are August and November (5.2mph).
Average humidity in September
Palermo, CA
- Average humidity in September: 34%
The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (33%).
Average rainfall in September
Palermo, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is March (4.61").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in September
Palermo, CA
- Average rainfall days in September: 2.3 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1.3 days).
Average snowfall days in September
Palermo, 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
Palermo, CA
- Average daylight in September: 12h and 24min
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 24min).
- Average sunshine in September: 11h and 12min
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 48min).
Average sunshine days in September
Palermo, CA
- Average sunshine days in September: 27 days
The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is March (15.5 days).
Average UV index in September
Palermo, 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
Palermo, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Palermo, 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).
