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
September begins with an average high-temperature of a moderately hot 85.8°F (29.9°C), reflecting close similarity to the preceding month. Despite a stark disparity with daily highs, Winchester records an average nighttime temperature of 61.3°F (16.3°C) in September.Heat index
September's average heat index is estimated at a tropical 87.8°F (31°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely vital to babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
Humidity
The average relative humidity in September is 49%.Rainfall
In Winchester, in September, during 3.5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 55.7 rainfall days, and 7.05" (179mm) of precipitation is accumulated.Snowfall
In Winchester, California, snow does not fall in January, March through December.Daylight
In Winchester, the average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:42 am and sunset at 6:33 pm PDT.
Sunshine
The average sunshine in September is 10.6h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day 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
Winchester, CA
- Average high temperature in September: 85.8°F
The warmest month (with the highest average high temperature) is August (89.6°F).
The month with the lowest average high temperature is December (61°F).
- Average low temperature in September: 61.3°F
The month with the highest average low temperature is August (63.3°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure in September
Winchester, CA
- Average pressure in September: 29.87"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Winchester, CA
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest months (with the lowest average wind speed) are August and September (4.2mph).
Average humidity in September
Winchester, CA
- Average humidity in September: 49%
The month with the highest relative humidity is May (60%).
The month with the lowest relative humidity is August (47%).
Average rainfall in September
Winchester, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is December (1.38").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in September
Winchester, CA
- Average rainfall days in September: 3.5 days
The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.3 days).
Average snowfall in September
Winchester, 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
Winchester, 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
Winchester, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in September
Winchester, CA
- Average sunshine days in September: 23.4 days
The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in September
Winchester, 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
Winchester, CA
- Average cloud cover in September: 8
The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Winchester, 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).
Winchester, California, USA
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