September weather forecast
Newark, CA

Share

Weather in September

September, the first month of the autumn in Newark, is also a moderately hot month, with an average temperature ranging between min 56.3°F (13.5°C) and max 79.2°F (26.2°C).

Temperature

Upon the onset of September, Newark witnesses an average high-temperature of a still moderately hot 79.2°F (26.2°C), showing a close resemblance to the prior month. Newark registers a significant reduction from the day's heat, with an average temperature drop to a refreshing 56.3°F (13.5°C) in September.

Humidity

The months with the lowest humidity are July and September, with an average relative humidity of 61%.

Rainfall

Months with rainfall are January through June, September through December. September is the first month it rains. Throughout September, in the average 1.5 rainfall days, it receives 0.04" (1mm) of precipitation. Throughout the year, there are 43.5 rainfall days, and 2.36" (60mm) of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 25min.
On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm PDT.

Sunshine

The average sunshine in September is 11.1h.

UV index

In Newark, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: An average UV index of 5 in September transforms into this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The average high-temperature and low-temperature during September are 79.2°F (26.2°C) and 56.3°F (13.5°C) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in July is evaluated at 82.4°F (28°C).

What is the least humid month?

July and September, with an average relative humidity of 61%, are the least humid months.

What is the average humidity in September?

The average relative humidity in September is 61%.

When does it start to rain?

September is the first month it rains. Throughout September, in the average 1.5 rainfall days, it receives 0.04" (1mm) of precipitation.

How many hours of daylight does Newark have in September?

In Newark, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Newark?

In September, on the first day of the month, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:52 pm PDT.

How long on average sun shines in September in Newark?

In September, the average sunshine duration is 11.1h.

What is the UV index intensity in September in Newark?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Newark, CA

Average temperature in September - Newark, CA
  • Average high temperature in September: 79.2°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is December (56.5°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are January, February and December (43.7°F).

Average pressure in September
Newark, CA

Average pressure in September - Newark, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).

Average wind speed in September
Newark, CA

Average wind speed in September - Newark, CA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is May (6.2mph).
The calmest months (with the lowest average wind speed) are October and November (4.6mph).

Average humidity in September
Newark, CA

Average humidity in September - Newark, CA
  • Average humidity in September: 61%

The month with the highest relative humidity is March (72%).
The months with the lowest relative humidity are July and September (61%).

Average rainfall in September
Newark, CA

Average rainfall in September - Newark, CA
  • Average rainfall in September: 0.04"

The wettest months (with the highest rainfall) are February and March (0.47").
The driest months (with the least rainfall) are July and August (0").

Average rainfall days in September
Newark, CA

Average rainfall days in September - Newark, CA
  • Average rainfall days in September: 1.5 days

The month with the highest number of rainy days is March (8.2 days).
The month with the least rainy days is July (0.3 days).

Average daylight in September /
Average sunshine in September
Newark, CA

Average daylight in September / Average sunshine in September - Newark, 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 1min

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 54min).

Average sunshine days in September
Newark, CA

Average sunshine days in September - Newark, CA
  • Average sunshine days in September: 28.1 days

The month with the most sunshine days is July (30.5 days).
The month with the least sunshine days is February (21.3 days).

Average UV index in September
Newark, CA

Average UV index in September - Newark, CA
  • Average UV index in September: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).

Average cloud cover in September
Newark, CA

Average cloud cover in September - Newark, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).

Average visibility in September
Newark, CA

Average visibility in September - Newark, 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).

Newark, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location