September weather forecast and climate
Martinez, CA

A cow grazing in the vast Martinez Hills
A cow grazing in the vast Martinez Hills' fields near Martinez Town, California

Weather in September

The first month of the autumn, September, is also a moderately hot month in Martinez, California, with average temperature varying between 57.6°F (14.2°C) and 82.8°F (28.2°C).

Temperature

In Martinez, the average high-temperature in September is essentially the same as in August - a still moderately hot 82.8°F (28.2°C). In Martinez, California, in September, the average low-temperature is 57.6°F (14.2°C).

Heat index

In September, the average heat index is calculated to 84.7°F (29.3°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', 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 subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, clothing). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

Months with the lowest humidity are September and October, with an average relative humidity of 56%.

Rainfall

In Martinez, California, during 2 rainfall days, 0.08" (2mm) of precipitation is typically accumulated. In Martinez, during the entire year, the rain falls for 48.9 days and collects up to 4.96" (126mm) of precipitation.

Daylight

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

Sunshine

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

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
[Resources]

FAQ

What is the temperature in September in Martinez?

In September, in Martinez, the average high-temperature is 82.8°F (28.2°C), and the average low-temperature is 57.6°F (14.2°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines air temperature and relative humidity, in September is estimated at 84.7°F (29.3°C).

What are the least humid months in Martinez?

September and October, with an average relative humidity of 56%, are the least humid months in Martinez, California.

What is the average humidity in September in Martinez?

The average relative humidity in September in Martinez, California, is 56%.

How many days does it rain in September in Martinez?

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

How many hours of daylight does Martinez have in September?

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

How many hours of sunshine does Martinez have in September?

The average sunshine in September in Martinez is 11.1h.

What is the UV index intensity in September in Martinez?

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

Average temperature in September
Martinez, CA

Average temperature in September - Martinez, CA
  • Average high temperature in September: 82.8°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is December (55.4°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is September (57.6°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).

[Resources]

Average pressure in September
Martinez, CA

Average pressure in September - Martinez, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

[Resources]

Average wind speed in September
Martinez, CA

Average wind speed in September - Martinez, CA
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

[Resources]

Average humidity in September
Martinez, CA

Average humidity in September - Martinez, CA
  • Average humidity in September: 56%

The month with the highest relative humidity is March (74%).
Months with the lowest relative humidity are September and October (56%).

[Resources]

Average rainfall in September
Martinez, CA

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

The wettest month (with the highest rainfall) is February (0.98").
The driest months (with the least rainfall) are July and August (0.04").

[Resources]

Average rainfall days in September
Martinez, CA

Average rainfall days in September - Martinez, CA
  • Average rainfall days in September: 2 days

The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is August (1 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Martinez, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
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: 12h).
The month with the least sunshine is December (Average sunshine: 5.7h).

[Resources]

Average sunshine days in September
Martinez, CA

Average sunshine days in September - Martinez, CA
  • Average sunshine days in September: 27.6 days

The month with the most sunshine days is July (29 days).
Months with the least sunshine days are February and March (22.1 days).

[Resources]

Average UV index in September
Martinez, CA

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

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

Average cloud cover in September
Martinez, CA

Average cloud cover in September - Martinez, CA
  • Average cloud cover in September: 10

Months with the most cloud cover are March and December (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 7).

[Resources]

Average visibility in September
Martinez, CA

Average visibility in September - Martinez, 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).

[Resources]