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 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
Patterson's transition from August to September introduces an average high-temperature of a hot 89.8°F (32.1°C), marking an insignificant variation from the 95°F (35°C). Patterson's temperature exhibits a stark contrast from daytime to nighttime, averaging lows of 59.2°F (15.1°C) in September.Heat index
In September, the average heat index is calculated to be a tropical 91.4°F (33°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
In Patterson, California, the average relative humidity in September is 43%.Rainfall
In Patterson, in September, during 1.8 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. In Patterson, during the entire year, the rain falls for 49.1 days and collects up to 2.8" (71mm) of precipitation.Daylight
In Patterson, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:48 pm PDT.
Sunshine
In Patterson, the average sunshine in September is 11.5h.UV index
In September, the average daily maximum UV index in Patterson is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Take precautions - Protection against sunburn is recommended. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in Patterson in September?
What is the average humidity in September in Patterson?
How many days does it rain in September in Patterson?
How many hours of daylight does Patterson have in September?
When is the sunrise / sunset in September in Patterson?
How many hours of sunshine does Patterson have in September?
How high is the UV index in September in Patterson?
Average temperature in September
Patterson, CA
- Average high temperature in September: 89.8°F
The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 59.2°F
The months with the highest average low temperature are July and August (60.8°F).
The coldest months (with the lowest average low temperature) are January and December (41°F).
Average pressure in September
Patterson, 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
Patterson, CA
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest months (with the lowest average wind speed) are January and November (5.1mph).
Average humidity in September
Patterson, CA
- Average humidity in September: 43%
The month with the highest relative humidity is January (72%).
The month with the lowest relative humidity is July (39%).
Average rainfall in September
Patterson, CA
- Average rainfall in September: 0.08"
The wettest months (with the highest rainfall) are March and December (0.47").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in September
Patterson, CA
- Average rainfall days in September: 1.8 days
The month with the highest number of rainy days is March (8.5 days).
The month with the least rainy days is June (1 days).
Average daylight in September /
Average sunshine in September
Patterson, 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 3min
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 0min).
Average sunshine days in September
Patterson, CA
- Average sunshine days in September: 27.2 days
The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (20.9 days).
Average UV index in September
Patterson, CA
- Average UV index in September: 5
The months with the highest UV index are June and 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
Patterson, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Patterson, 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).
Patterson, California, USA
Weather forecast for your location
2. Allow the app to use your location