September weather forecast and climate
Fremont, CA

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

The first month of the autumn, September, is still a warm month in Fremont, California, with average temperature fluctuating between 80.6°F (27°C) and 56.3°F (13.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still warm 80.6°F (27°C). In September, in Fremont, the average low-temperature is 56.3°F (13.5°C).

Heat index

In September, the average heat index is appraised at 82.4°F (28°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, differences in body mass, height, and shape, metabolic differences), and activity. 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 particularly important for children. 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.

Humidity

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

Rainfall

In Fremont, during September, the rain falls for 1.9 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Fremont, during the entire year, the rain falls for 49.6 days and collects up to 3.86" (98mm) of precipitation.

Ocean temperature

In Fremont, California, the average seawater temperature is 57.6°F (14.2°C).
Note: 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.

Daylight

In Fremont, the average length of the day in September is 12.4h.

Sunshine

The average sunshine in September is 11.1h.

UV index

In Fremont, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Fremont?

The average high-temperature, in September, 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. 'real feel', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is estimated at 82.4°F (28°C).

What is the least humid month in Fremont?

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

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 September, in Fremont, the rain falls for 1.9 days. Throughout September, 0.08" (2mm) of precipitation is accumulated.

How cold is the water in September in Fremont?

In Fremont, in September, the average water temperature is 57.6°F (14.2°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in September in Fremont?

In September, the average length of the day in Fremont, California, is 12.4h.

How long on average sun shines in September in Fremont?

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

What is the UV index reading in September in Fremont?

In Fremont, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

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"

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

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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%).
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: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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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

Months with the highest UV index are June and July (UV index 6).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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