September weather forecast
Newark, CA

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Weather in September

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

Temperature

As Newark welcomes September, the average high-temperature stabilizes at a still warm 79.2°F (26.2°C), showing little deviation from August's 80.4°F (26.9°C). September presents a pronounced divergence from daily peak temperatures in Newark, with the average low-temperature of 56.3°F (13.5°C).

Humidity

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

Rainfall

January through June, September through December are months with rainfall. September is the first month it rains. Throughout September, in the average 1.5 rainfall days, it receives 0.04" (1mm) of precipitation. In Newark, during the entire year, the rain falls for 43.5 days and collects up to 2.36" (60mm) of precipitation.

Daylight

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

Sunshine

In September, the average sunshine is 11.1h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Tightly woven clothing, when worn loosely, shields effectively against the Sun.

Frequently asked questions

What are the temperatures in September?

The average high-temperature, in September, in Newark, is 79.2°F (26.2°C), while the average low-temperature is 56.3°F (13.5°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 82.4°F (28°C).

What are the least humid months?

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

What is the average humidity in September in Newark?

In September, the average relative humidity 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.

What is the average length of the day in September?

The average day length in September is 12h and 25min.

When is the sunrise / sunset in September?

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.

How long on average sun shines in September?

In Newark, the average sunshine duration in September is 11.1h.

How high is the UV index in September?

In Newark, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to 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

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