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 snowfall in September
- Average snowfall 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 start of September sees the average high-temperature at a moderately hot 85.1°F (29.5°C), showing little difference from August's 90.1°F (32.3°C). September nights bring a pronounced temperature shift, with averages hovering around a moderate 55.8°F (13.2°C).Heat index
For September, the heat index is calculated to be a tropical 86°F (30°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Humidity
In Cobb, the average relative humidity in September is 45%.Rainfall
In Cobb, during September, the rain falls for 2.1 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Cobb, during the entire year, the rain falls for 79.8 days and collects up to 17.44" (443mm) of precipitation.Snowfall
In Cobb, snow does not fall in April through October.Daylight
In Cobb, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:06 am and sunset at 6:54 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
In Cobb, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in September?
What is the average humidity in September in Cobb?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Cobb have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Cobb, CA
- Average high temperature in September: 85.1°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is December (52.7°F).
- Average low temperature in September: 55.8°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is December (38.1°F).
Average pressure in September
Cobb, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in September
Cobb, CA
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.3mph).
Average humidity in September
Cobb, CA
- Average humidity in September: 45%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (44%).
Average rainfall in September
Cobb, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (3.7").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Cobb, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (13.9 days).
The months with the least rainy days are July and August (1.1 days).
Average snowfall in September
Cobb, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Cobb, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Cobb, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Cobb, CA
- Average sunshine days in September: 27.1 days
The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.8 days).
Average UV index in September
Cobb, CA
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in September
Cobb, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Cobb, 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).
Cobb, California, USA
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