Fresno
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Fresno, CA

The artificial Millerton Lake near Fresno in California, clear skies, and mountain ranges
The artificial Millerton Lake near Fresno in California, clear skies, and mountain ranges
The first month of the autumn, Septiembre, is still a hot month in Fresno, California, with average temperature fluctuating between 90.9°F (32.7°C) and 61.5°F (16.4°C).

Temperature

In Fresno, the average high-temperature marginally drops, from a sweltering 97.2°F (36.2°C) in Agosto, to a tropical 90.9°F (32.7°C). In Septiembre, the average low-temperature is 61.5°F (16.4°C).

Heat index

The average heat index is estimated at a very hot 96.3°F (35.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, wind, metabolic differences, and clothing affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Septiembre, the average relative humidity in Fresno is 50%.

Rainfall

In Fresno, during 1 rainfall days, 0.17" (4.3mm) of precipitation is typically accumulated. Throughout the year, there are 48.1 rainfall days, and 11.5" (292.2mm) of precipitation is accumulated.

Daylight

The average length of the day in Fresno, California, is 12.4h.

Sunshine

In Fresno, the average sunshine is 11.5h.

UV index

In Fresno, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in Septiembre in Fresno?

In Fresno, California, in Septiembre, the average high-temperature is 90.9°F (32.7°C), and the average low-temperature is 61.5°F (16.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), that represents influence of the relative humidity to air temperaure, in Septiembre is calculated to 96.3°F (35.7°C).

What is the average humidity in Septiembre in Fresno?

In Fresno, the average relative humidity in Septiembre is 50%.

How much does it rain in Fresno in Septiembre?

In Septiembre, in Fresno, California, the rain falls for 1 days. Throughout Septiembre, 0.17" (4.3mm) of precipitation is accumulated.

How many hours of daylight does Fresno have in Septiembre?

In Fresno, California, the average length of the day in Septiembre is 12.4h.

How long on average sun shines in Septiembre in Fresno?

The average sunshine in Septiembre in Fresno, California, is 11.5h.

What is the UV index reading in Septiembre in Fresno?

In Fresno, California, the average daily maximum UV index in Septiembre is 7. A UV Index estimate of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Fresno, CA
  • Average high temperature in September: 90.9°F

The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is January (54.8°F).

  • Average low temperature in September: 61.5°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is December (38°F).

Average humidity in September - Fresno, CA
  • Average humidity in September: 50%

The month with the highest relative humidity is December (84.2%).
The month with the lowest relative humidity is July (39.2%).

Average rainfall in September - Fresno, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is January (2.2").
Driest months (with the lowest rainfall) are July and August (0").

Average rainfall days in September - Fresno, CA
  • Average rainfall days in September: 1 days

The month with the highest number of rainy days is February (8.6 days).
The month with the lowest number of rainy days is July (0.2 days).

Average daylight in September / Average sunshine in September - Fresno, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.7h).

  • Average sunshine in September: 11.5h

The month with most sunshine is July (Average sunshine: 13.8h).
The month with least sunshine is December (Average sunshine: 4.1h).

Average UV index in September - Fresno, CA
  • Average UV index in September: 7

Months with the highest UV index are June and July (UV index 10).
Months with the lowest UV index are January and December (UV index 2).