September weather forecast
San Leandro, CA

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Weather in September

The first month of the autumn, September, is still a warm month in San Leandro, California, with an average temperature fluctuating between 77.7°F (25.4°C) and 56.5°F (13.6°C).

Temperature

San Leandro witnesses its highest temperatures in July and September, reaching an average of 77.7°F (25.4°C).

Humidity

The months with the lowest humidity in San Leandro are September and October, with an average relative humidity of 64%.

Rainfall

The months with the least rainfall are July through September Rain falls for 1.8 days and accumulates 0.04" (1mm) of rain.

Daylight

In September, the average length of the day in San Leandro is 12h and 25min.
On the first day of the month, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of September, in San Leandro, California, sunrise is at 7:04 am and sunset at 6:52 pm PDT.

Sunshine

The average sunshine in September is 11.1h.

UV index

In San Leandro, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: During September, 5 as the daily maximum UV index converts into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.

Frequently asked questions

What is the warmest month in San Leandro?

San Leandro sees its peak of temperatures during July and September, with an average high-temperature of 77.7°F (25.4°C).

What is the temperature in September in San Leandro?

The high-temperature, in September, in San Leandro, records 77.7°F (25.4°C), while the low-temperature is 56.5°F (13.6°C).

What is the least humid month in San Leandro?

The months with the lowest humidity are September and October, with an average relative humidity of 64%.

What is the average humidity in September in San Leandro?

In September, the average relative humidity in San Leandro, California, is 64%.

What is the driest month in San Leandro?

July through September are months with the least rain in San Leandro when the rain falls for 1.8 days and typically aggregates up to 0.04" (1mm) of rain.

How much does it rain in San Leandro in September?

In San Leandro, California, in September, during 1.8 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

What is the average length of the day in September in San Leandro?

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

When are sunrise and sunset in September in San Leandro?

On the first day of September in San Leandro, California, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm PDT.

How many hours of sunshine does San Leandro have in September?

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

What is the UV index reading in September in San Leandro?

In San Leandro, California, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents 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
San Leandro, CA

Average temperature in September - San Leandro, CA
  • Average high temperature in September: 77.7°F

The warmest months (with the highest average high temperature) are July and September (77.7°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is January (44.1°F).

Average pressure in September
San Leandro, CA

Average pressure in September - San Leandro, 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
San Leandro, CA

Average wind speed in September - San Leandro, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is May (7mph).
The calmest month (with the lowest average wind speed) is November (4.8mph).

Average humidity in September
San Leandro, CA

Average humidity in September - San Leandro, CA
  • Average humidity in September: 64%

The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (64%).

Average rainfall in September
San Leandro, CA

Average rainfall in September - San Leandro, CA
  • Average rainfall in September: 0.04"

The wettest month (with the highest rainfall) is February (1.26").
The driest months (with the least rainfall) are July, August and September (0.04").

Average rainfall days in September
San Leandro, CA

Average rainfall days in September - San Leandro, CA
  • Average rainfall days in September: 1.8 days

The month with the highest number of rainy days is March (10.2 days).
The month with the least rainy days is August (0.7 days).

Average daylight in September /
Average sunshine in September
San Leandro, CA

Average daylight in September / Average sunshine in September - San Leandro, 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 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in September
San Leandro, CA

Average sunshine days in September - San Leandro, CA
  • Average sunshine days in September: 27 days

The month with the most sunshine days is July (27.1 days).
The month with the least sunshine days is March (19.1 days).

Average UV index in September
San Leandro, CA

Average UV index in September - San Leandro, CA
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September
San Leandro, CA

Average cloud cover in September - San Leandro, CA
  • Average cloud cover in September: 11

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 8).

Average visibility in September
San Leandro, CA

Average visibility in September - San Leandro, 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).

San Leandro, California, USA

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