September weather forecast
Fremont, CA

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A beautiful landscape of winding roads and serene residential estate in Fremont, California
A beautiful landscape of winding roads and serene residential estate in Fremont, California

Weather in September

September signals the end of summer and the beginning of fall in Fremont. The heat starts to dissipate, and the weather becomes more pleasant. The average sea temperature drops slightly but is still warm enough for beach activities. Cloud cover begins to increase again, but it does not overshadow the fact that Fremont still enjoys 11.1 hours of sunshine per day. The gentle decline in daylight is matched by an increase in humidity, averaging at 59%.

Temperature

In Fremont, September's average high-temperature stands at a still warm 80.6°F (27°C), closely related to the preceding month. Despite a noticeable differential from daytime highs, Fremont notes an average nighttime low-temperature of 56.3°F (13.5°C) in September.

Heat index

September's mean heat index is evaluated at 82.4°F (28°C). Constant activity during exposure could result in a state of weariness and possibly heat cramps.
The metrics for the heat index are tailored for both shady environments and light winds. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.

Humidity

July and September, with an average relative humidity of 59%, are the least humid months.

Rainfall

In Fremont, in September, during 1.9 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. Throughout the year, in Fremont, there are 49.6 rainfall days, and 3.86" (98mm) of precipitation is accumulated.

Ocean temperature

In Fremont, the average seawater temperature in September is 57.6°F (14.2°C).
Note: To swim in 57.6°F (14.2°C) at less than 50°F (10°C), ensure you're well-protected. Without it, be prepared for a sudden jolt of cold and breathing issues. Remember, even 55.4°F (13°C) is not welcoming.

Daylight

The average length of the day in September in Fremont is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September is 11.1h.

UV index

In Fremont, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: A maximum UV index of 5 in September translates into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Always opt for UVA and UVB-resistant sunglasses on radiant days.
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Frequently asked questions

What is the usual temperature for Fremont in September?

The average high-temperature, in September, in Fremont, is 80.6°F (27°C), while the average low-temperature is 56.3°F (13.5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is evaluated at 82.4°F (28°C).

What are the least humid months in Fremont?

The months with the lowest humidity in Fremont are July and September, with an average relative humidity of 59%.

What is the average humidity in September in Fremont?

In Fremont, the average relative humidity in September is 59%.

How many days does it rain in September in Fremont?

In Fremont, California, in September, it is raining for 1.9 days, with typically 0.08" (2mm) of accumulated precipitation.

How cold is the water in September in Fremont?

In Fremont, California, in September, the average water temperature is 57.6°F (14.2°C). Swimming in 57.6°F (14.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Fremont have in September?

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

When are sunrise and sunset in September in Fremont?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:36 pm. On the last day of the month, in Fremont, California, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

How long on average sun shines in September in Fremont?

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

How high is the UV index in September in Fremont?

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

Average temperature in September
Fremont, CA

Average temperature in September - Fremont, CA
  • Average high temperature in September: 80.6°F

The warmest month (with the highest average high temperature) is July (82.6°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 month (with the lowest average low temperature) is January (42.8°F).

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Average pressure in September
Fremont, CA

Average pressure in September - Fremont, 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).

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Average wind speed in September
Fremont, CA

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

The windiest month (with the highest average wind speed) is May (6.1mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

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Average humidity in September
Fremont, CA

Average humidity in September - Fremont, CA
  • Average humidity in September: 59%

The month with the highest relative humidity is March (72%).
The months with the lowest relative humidity are July and September (59%).

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Average rainfall in September
Fremont, CA

Average rainfall in September - Fremont, CA
  • Average rainfall in September: 0.08"

The wettest months (with the highest rainfall) are January, February, March and December (0.67").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in September
Fremont, CA

Average rainfall days in September - Fremont, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is March (8.9 days).
The month with the least rainy days is August (0.5 days).

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Average sea temperature in September
Fremont, CA

Average sea temperature in September - Fremont, CA
  • Average sea temperature in September: 57.5°F

The best month for swimming (with the highest average sea temperature) is August (57.7°F).
The coldest months (with the lowest average sea temperature) are February and April (53.2°F).

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

Average daylight in September / Average sunshine in September - Fremont, 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).

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Average sunshine days in September
Fremont, CA

Average sunshine days in September - Fremont, CA
  • Average sunshine days in September: 27.7 days

The month with the most sunshine days is July (30 days).
The month with the least sunshine days is March (20.7 days).

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Average UV index in September
Fremont, CA

Average UV index in September - Fremont, 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 January, February, November and December (UV index 3).

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Average cloud cover in September
Fremont, CA

Average cloud cover in September - Fremont, 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).

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Average visibility in September
Fremont, CA

Average visibility in September - Fremont, 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).

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Fremont, California, USA

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