Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
As Fremont steps into September, the average high-temperature holds at a still moderately hot 80.6°F (27°C), hinting at a minor fluctuation from the prior month. With a notable difference from peak temperatures, an average of 56.3°F (13.5°C) marks the nights in September.Heat index
The average heat index in September is calculated to be 82.4°F (28°C). Prolonged exposure combined with continuous activity could lead to exhaustion, and possibly heat cramps.Metrics for the heat index primarily focus on shaded spots and light wind conditions. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is achieved by amalgamating air temperature with the relative humidity readings. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially vital to children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Humidity
July and September, with an average relative humidity of 59%, are the least humid months in Fremont.Rainfall
In September, the rain falls for 1.9 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, in Fremont, there are 49.6 rainfall days, and 3.86" (98mm) of precipitation is accumulated.Ocean temperature
In September, the average ocean temperature is 57.6°F (14.2°C).Note: Swimming in 57.6°F (14.2°C) feels unbearing at 55.4°F (13°C) and can be life-risking below 50°F (10°C), causing breathing issues and cold shock, depending on a person's capacity.
Daylight
In Fremont, the average length of the day in September 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, in Fremont, sunrise is at 7:03 am and sunset at 6:51 pm PDT.
Sunshine
In Fremont, the average sunshine in September is 11.1h.UV index
In September, 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 UV radiation for the ordinary person.Note: An average UV index of 5 in September transforms into this advice:
Make use of precautions - It is urged to ward off sun damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What are the least humid months?
What is the average humidity in September?
How much does it rain in September?
What is the water temperature in September?
How many hours of daylight does Fremont have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
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).
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).
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).
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%).
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").
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).
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).
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).
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).
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).
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).
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).
Fremont, California, USA
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