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
In September, the average high-temperature marginally decreases from a very hot 96.8°F (36°C) in August to a tropical 90.5°F (32.5°C). September nights bring a significant cooling from the heat of the day, with averages of 61.5°F (16.4°C).Humidity
The average relative humidity in September is 33%.Rainfall
The months with the least rainfall are June, August and September Rain falls for 1.7 days and accumulates 0.08" (2mm) of rain.Snowfall
January, March through December are months without snowfall.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September in Rosedale, sunrise is at 6:29 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:41 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 6 during September translates into the following recommendations:
Fend off overexposure. Sun protection is vital. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September in Rosedale?
When it does not snow?
How many hours of daylight does Rosedale have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Rosedale, CA
- Average high temperature in September: 90.5°F
The warmest month (with the highest average high temperature) is July (97.5°F).
The month with the lowest average high temperature is December (58.5°F).
- Average low temperature in September: 61.5°F
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure in September
Rosedale, CA
- Average pressure in September: 29.9"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Rosedale, CA
- Average wind speed in September: 4.3mph
The windiest months (with the highest average wind speed) are June and July (5mph).
The calmest months (with the lowest average wind speed) are November and December (3.9mph).
Average humidity in September
Rosedale, CA
- Average humidity in September: 33%
The months with the highest relative humidity are January, February and December (59%).
The month with the lowest relative humidity is August (30%).
Average rainfall in September
Rosedale, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is December (1.02").
The driest months (with the least rainfall) are June, August and September (0.08").
Average rainfall days in September
Rosedale, CA
- Average rainfall days in September: 1.7 days
The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is August (0.9 days).
Average snowfall in September
Rosedale, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.04").
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
Rosedale, 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, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Rosedale, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 11h and 1min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 6h and 42min).
Average sunshine days in September
Rosedale, CA
- Average sunshine days in September: 27.9 days
The month with the most sunshine days is August (28.7 days).
The month with the least sunshine days is February (21.2 days).
Average UV index in September
Rosedale, CA
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover in September
Rosedale, CA
- Average cloud cover in September: 5
The month with the most cloud cover is March (Cloud cover 26).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility in September
Rosedale, 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).
Rosedale, California, USA
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