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 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
Tracy experiences a subtle adjustment in high-temperatures to a still tropical 86.5°F (30.3°C) with the onset of September, maintaining near parity with August's 91.4°F (33°C). The average low-temperature of 56.8°F (13.8°C) in September in Tracy represents a significant drop from the daily high.Heat index
September's heat index is computed to be a tropical 87.8°F (31°C). Constant activity during exposure could result in a state of weariness and possibly heat cramps.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are highly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Humidity
In September, the average relative humidity in Tracy, California, is 48%.Rainfall
In Tracy, in September, during 2.5 rainfall days, 0.16" (4mm) of precipitation is typically accumulated. In Tracy, during the entire year, the rain falls for 60.6 days and collects up to 5.71" (145mm) of precipitation.Snowfall
In Tracy, snow does not fall in January through November.Daylight
The average length of the day in September in Tracy, California, is 12h and 25min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:34 pm. On the last day of September, in Tracy, California, sunrise is at 7:01 am and sunset at 6:49 pm PDT.
Sunshine
In Tracy, the average sunshine in September is 11.4h.UV index
The average daily maximum UV index in September in Tracy is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 5 in September leads to these guidelines:
Make use of precautions - Shielding skin and eyes from injury is a requirement. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Tracy in September?
What is the average humidity in September in Tracy?
How much does it rain in Tracy in September?
When it does not snow in Tracy?
How many hours of daylight does Tracy have in September?
What time are sunrise and sunset in September in Tracy?
How long on average sun shines in September in Tracy?
What is the UV index reading in September in Tracy?
Average temperature in September
Tracy, CA
- Average high temperature in September: 86.5°F
The warmest month (with the highest average high temperature) is July (92.5°F).
The month with the lowest average high temperature is December (54.1°F).
- Average low temperature in September: 56.8°F
The month with the highest average low temperature is August (58.6°F).
The coldest months (with the lowest average low temperature) are January and December (40.1°F).
Average pressure in September
Tracy, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Tracy, CA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity in September
Tracy, CA
- Average humidity in September: 48%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is July (45%).
Average rainfall in September
Tracy, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is March (1.06").
The driest months (with the least rainfall) are June and August (0.08").
Average rainfall days in September
Tracy, CA
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is August (1.2 days).
Average snowfall days in September
Tracy, 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
Tracy, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 2min
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
Tracy, CA
- Average sunshine days in September: 26.8 days
The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (18.4 days).
Average UV index in September
Tracy, 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 January, February, November and December (UV index 3).
Average cloud cover in September
Tracy, CA
- Average cloud cover in September: 8
The month with the most cloud cover is March (Cloud cover 36).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in September
Tracy, 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).
Tracy, California, USA
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