September weather forecast
Atwater, CA

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Weather in September

September, the first month of the autumn in Atwater, is still a hot month, with an average temperature fluctuating between 91.4°F (33°C) and 61.3°F (16.3°C).

Temperature

September witnesses a gentle descent in average high-temperature, descending from August's very hot 97.3°F (36.3°C) to a hot 91.4°F (33°C). The nighttime temperature in Atwater during September displays a significant divergence from daily peaks, averaging at a refreshing 61.3°F (16.3°C).

Humidity

The average relative humidity in September is 38%.

Rainfall

June through September are months with the least rain in Atwater when the rain falls for 1.1 days and typically aggregates up to 0.04" (1mm) of rain.

Daylight

The average length of the day in September in Atwater is 12h and 25min.
On the first day of September in Atwater, sunrise is at 6:33 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:46 pm PDT.

Sunshine

In Atwater, the average sunshine in September is 11.5h.

UV index

In September, the average daily maximum UV index in Atwater, California, is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.
Note: In September, a regular UV index of 6 translates into these guidelines:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
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Frequently asked questions

How hot is it in Atwater in September?

The high-temperature, in September, in Atwater, records 91.4°F (33°C), while the low-temperature is 61.3°F (16.3°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in May is calculated to be 82.4°F (28°C).

What is the average humidity in September in Atwater?

In Atwater, the average relative humidity in September is 38%.

What is the driest month in Atwater?

June through September are months with the least rain in Atwater when the rain falls for 1.1 days and typically aggregates up to 0.04" (1mm) of rain.

How many days does it rain in September in Atwater?

In Atwater, California, in September, it is raining for 1.1 days, with typically 0.04" (1mm) of accumulated precipitation.

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

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

When are sunrise and sunset in September in Atwater?

In September, on the first day of the month, sunrise is at 6:33 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:46 pm PDT.

How long on average sun shines in September in Atwater?

The average sunshine duration in September in Atwater, California, is 11.5h.

How high is the UV index in September in Atwater?

In Atwater, California, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Atwater, CA

Average temperature in September - Atwater, CA
  • Average high temperature in September: 91.4°F

The warmest month (with the highest average high temperature) is July (98.6°F).
The month with the lowest average high temperature is December (56.1°F).

  • Average low temperature in September: 61.3°F

The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

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Average pressure in September
Atwater, CA

Average pressure in September - Atwater, CA
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Atwater, CA

Average wind speed in September - Atwater, CA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in September
Atwater, CA

Average humidity in September - Atwater, CA
  • Average humidity in September: 38%

The month with the highest relative humidity is January (71%).
The month with the lowest relative humidity is July (34%).

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Average rainfall in September
Atwater, CA

Average rainfall in September - Atwater, CA
  • Average rainfall in September: 0.04"

The wettest months (with the highest rainfall) are March and December (0.55").
The driest months (with the least rainfall) are June, July, August and September (0.04").

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Average rainfall days in September
Atwater, CA

Average rainfall days in September - Atwater, CA
  • Average rainfall days in September: 1.1 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (0.5 days).

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

Average daylight in September / Average sunshine in September - Atwater, 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 3min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 12min).

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Average sunshine days in September
Atwater, CA

Average sunshine days in September - Atwater, CA
  • Average sunshine days in September: 28.5 days

The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is February (23 days).

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Average UV index in September
Atwater, CA

Average UV index in September - Atwater, CA
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
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
Atwater, CA

Average cloud cover in September - Atwater, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 31).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Atwater, CA

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

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