September weather forecast
San Martin, CA

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Weather in September

September, the first month of the autumn in San Martin, is also a moderately hot month, with an average temperature fluctuating between 83.5°F (28.6°C) and 54.5°F (12.5°C).

Temperature

The arrival of September marks a slight shift to an average high-temperature of a still warm 83.5°F (28.6°C) from August's 85.8°F (29.9°C). Nightly readings in September display a noticeable downturn from daily highs, with the average low-temperature registering a fresh 54.5°F (12.5°C).

Heat index

During September, the heat index is computed to be a hot 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Data suggests that the heat index is set for environments in shade and with a light wind. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

July and September, with an average relative humidity of 55%, are the least humid months.

Rainfall

In San Martin, during September, the rain falls for 2.7 days and regularly aggregates up to 0.12" (3mm) of precipitation. In San Martin, during the entire year, the rain falls for 70.6 days and collects up to 10.83" (275mm) of precipitation.

Daylight

In September, the average length of the day is 12h and 24min.
On the first day of the month, sunrise is at 6:37 am and sunset at 7:34 pm. On the last day of September, in San Martin, sunrise is at 7:01 am and sunset at 6:50 pm PDT.

Sunshine

In September, the average sunshine is 11.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard 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:
Guard yourself - Precautionary measures against sun damage are advocated. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.

Frequently asked questions

How hot does it get in San Martin in September?

The high-temperature, in September, in San Martin, is 83.5°F (28.6°C), while the low-temperature averages to 54.5°F (12.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, in September is computed to be 86°F (30°C).

What are the least humid months?

July and September, with an average relative humidity of 55%, are the least humid months.

What is the average humidity in September?

In September, the average relative humidity is 55%.

How many days does it rain in September?

In San Martin, during September, the rain falls for 2.7 days and regularly aggregates up to 0.12" (3mm) of precipitation.

How many hours of daylight does San Martin have in September?

In San Martin, the average day length in September is 12h and 24min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:37 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:50 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 11.3h.

What is the UV index reading in September?

In San Martin, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health risk 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
San Martin, CA

Average temperature in September - San Martin, CA
  • Average high temperature in September: 83.5°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

Average pressure in September
San Martin, CA

Average pressure in September - San Martin, 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).

Average wind speed in September
San Martin, CA

Average wind speed in September - San Martin, CA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is May (5.4mph).
The calmest month (with the lowest average wind speed) is November (3.9mph).

Average humidity in September
San Martin, CA

Average humidity in September - San Martin, CA
  • Average humidity in September: 55%

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (55%).

Average rainfall in September
San Martin, CA

Average rainfall in September - San Martin, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is December (1.97").
The driest months (with the least rainfall) are June, July and August (0.08").

Average rainfall days in September
San Martin, CA

Average rainfall days in September - San Martin, CA
  • Average rainfall days in September: 2.7 days

The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (1 days).

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

Average daylight in September / Average sunshine in September - San Martin, 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 42min).

  • Average sunshine in September: 11h and 2min

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).

Average sunshine days in September
San Martin, CA

Average sunshine days in September - San Martin, CA
  • Average sunshine days in September: 26.2 days

The month with the most sunshine days is August (28.7 days).
The month with the least sunshine days is March (16.8 days).

Average UV index in September
San Martin, CA

Average UV index in September - San Martin, 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).

Average cloud cover in September
San Martin, CA

Average cloud cover in September - San Martin, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 5).

Average visibility in September
San Martin, CA

Average visibility in September - San Martin, 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 Martin, California, USA

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