September weather forecastPetrolia, CA
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Petrolia, California, with an average temperature fluctuating between 50.9°F (10.5°C) and 72.5°F (22.5°C).Temperature
The start of September sees the average high-temperature at a pleasant 72.5°F (22.5°C), showing little difference from August's 74.1°F (23.4°C). The anticipated average low-temperature for September in Petrolia, a fresh 50.9°F (10.5°C), shows a substantial deviation from the daytime maximums.Humidity
The least humid month in Petrolia is September, with an average relative humidity of 73%.Rainfall
In Petrolia, during September, the rain falls for 4 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, in Petrolia, there are 110.9 rainfall days, and 28.27" (718mm) of precipitation is accumulated.Snowfall
In Petrolia, California, snow does not fall in January, March through December.Daylight
In Petrolia, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 6:45 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:00 pm PDT.
Sunshine
In Petrolia, the average sunshine in September is 10.2h.UV index
In Petrolia, California, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests this advice:
Guard yourself - Precautionary measures against sun damage are advocated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Petrolia, CA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is December (52.9°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is February (39.7°F).
Average pressure in September
Petrolia, CA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are August and September (29.96"Hg).
Average wind speed in September
Petrolia, CA
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (7.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Petrolia, CA
- Average humidity in September: 73%
The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is September (73%).
Average rainfall in September
Petrolia, CA
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Petrolia, CA
- Average rainfall days in September: 4 days
The month with the highest number of rainy days is March (17.3 days).
The months with the least rainy days are July and August (1.8 days).
Average snowfall in September
Petrolia, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.59").
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
Petrolia, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Petrolia, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 10h and 12min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Petrolia, CA
- Average sunshine days in September: 25.8 days
The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (11.9 days).
Average UV index in September
Petrolia, CA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Petrolia, CA
- Average cloud cover in September: 19
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Petrolia, CA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
The months with the lowest visibility are May, July and August (5mi).
