September weather forecast
Milpitas, CA

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Weather in September

September, the first month of the autumn in Milpitas, is also a moderately hot month, with an average temperature varying between 80.2°F (26.8°C) and 55.6°F (13.1°C).

Temperature

The introduction of September notes a subtle temperature variation to a still moderately hot 80.2°F (26.8°C) from August's 82.4°F (28°C). From significant daily highs, Milpitas's nights in September cool down to an average low-temperature of 55.6°F (13.1°C).

Humidity

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

Rainfall

In Milpitas, during September, the rain falls for 2.2 days and regularly aggregates up to 0.08" (2mm) of precipitation. In Milpitas, during the entire year, the rain falls for 52.8 days and collects up to 4.06" (103mm) of precipitation.

Daylight

In September, the average length of the day in Milpitas is 12h and 25min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:35 pm. On the last day of September, in Milpitas, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September is 11.2h.

UV index

In Milpitas, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Adopt protective measures - Suggestions to resist sunburn are offered. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

What are September temperatures in Milpitas?

September temperatures vary between a high-temperature of 80.2°F (26.8°C) and a low-temperature of 55.6°F (13.1°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is calculated to be 86°F (30°C).

What is the average humidity in September in Milpitas?

The average relative humidity in September is 59%.

How many days does it rain in September in Milpitas?

In Milpitas, California, in September, during 2.2 rainfall days, 0.08" (2mm) of precipitation is typically accumulated.

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

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

When is the sunrise / sunset in September in Milpitas?

On the first day of September in Milpitas, California, sunrise is at 6:38 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Milpitas have in September?

The average sunshine duration in September in Milpitas, California, is 11.2h.

How high is the UV index in September in Milpitas?

In Milpitas, California, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to 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
Milpitas, CA

Average temperature in September - Milpitas, CA
  • Average high temperature in September: 80.2°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in September: 55.6°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 and December (42.6°F).

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Average pressure in September
Milpitas, CA

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

The month with the highest atmospheric pressure is January (30.14"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
Milpitas, CA

Average wind speed in September - Milpitas, CA
  • Average wind speed in September: 4.4mph

The windiest month (with the highest average wind speed) is May (5.8mph).
The calmest months (with the lowest average wind speed) are October and November (4.3mph).

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Average humidity in September
Milpitas, CA

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

The month with the highest relative humidity is March (73%).
The month with the lowest relative humidity is July (58%).

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Average rainfall in September
Milpitas, CA

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

The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in September
Milpitas, CA

Average rainfall days in September - Milpitas, CA
  • Average rainfall days in September: 2.2 days

The month with the highest number of rainy days is March (9.9 days).
The month with the least rainy days is August (0.4 days).

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

Average daylight in September / Average sunshine in September - Milpitas, 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: 6h and 0min).

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Average sunshine days in September
Milpitas, CA

Average sunshine days in September - Milpitas, CA
  • Average sunshine days in September: 26.8 days

The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in September
Milpitas, CA

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

The months with the highest UV index are June, July and August (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
Milpitas, CA

Average cloud cover in September - Milpitas, 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 5).

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Average visibility in September
Milpitas, CA

Average visibility in September - Milpitas, 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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Milpitas, California, USA

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