September weather forecast
Annapolis, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Annapolis, California, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 53.2°F (11.8°C).

Temperature

August's transformation into September witnesses an average high-temperature of a still moderately hot 80.1°F (26.7°C), noting a minor change from the preceding month. Despite a noticeable differential from daytime highs, Annapolis notes an average nighttime low-temperature of 53.2°F (11.8°C) in September.

Humidity

The months with the lowest humidity are July and September, with an average relative humidity of 60%.

Rainfall

In September, in Annapolis, the rain falls for 2.1 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. Throughout the year, in Annapolis, there are 83.1 rainfall days, and 21.38" (543mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall in Annapolis.

Daylight

In Annapolis, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

Sunshine

In Annapolis, California, the average sunshine in September is 10.9h.

UV index

In Annapolis, California, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum high UV index of 5 in September translates into the following recommendations:
Be vigilant - Preventing sunburn is recommended. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
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Frequently asked questions

What are the temperatures in Annapolis in September?

An average high-temperature, in September, in Annapolis, is 80.1°F (26.7°C) and the average low-temperature is 53.2°F (11.8°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is evaluated at 87.8°F (31°C).

What is the least humid month in Annapolis?

The months with the lowest humidity in Annapolis are July and September, with an average relative humidity of 60%.

What is the average humidity in September in Annapolis?

In Annapolis, California, the average relative humidity in September is 60%.

How much does it rain in Annapolis in September?

In September, in Annapolis, the rain falls for 2.1 days. Throughout September, 0.16" (4mm) of precipitation is accumulated.

When it does not snow in Annapolis?

In Annapolis, California, snow does not fall in January, March through December.

How many hours of daylight does Annapolis have in September?

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

What time are sunrise and sunset in September in Annapolis?

On the first day of September in Annapolis, sunrise is at 6:43 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

How many hours of sunshine does Annapolis have in September?

In Annapolis, the average sunshine duration in September is 10.9h.

What is the UV index reading in September in Annapolis?

The average daily maximum UV index in September in Annapolis, California, is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Annapolis, CA

Average temperature in September - Annapolis, CA
  • Average high temperature in September: 80.1°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (54.7°F).

  • Average low temperature in September: 53.2°F

The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (39.9°F).

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Average pressure in September
Annapolis, CA

Average pressure in September - Annapolis, 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).

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Average wind speed in September
Annapolis, CA

Average wind speed in September - Annapolis, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in September
Annapolis, CA

Average humidity in September - Annapolis, CA
  • Average humidity in September: 60%

The month with the highest relative humidity is March (78%).
The months with the lowest relative humidity are July and September (60%).

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Average rainfall in September
Annapolis, CA

Average rainfall in September - Annapolis, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (4.49").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Annapolis, CA

Average rainfall days in September - Annapolis, CA
  • Average rainfall days in September: 2.1 days

The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is August (0.9 days).

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Average snowfall in September
Annapolis, CA

Average snowfall in September - Annapolis, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.2").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in September
Annapolis, CA

Average snowfall days in September - Annapolis, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in September / Average sunshine in September - Annapolis, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Annapolis, CA

Average sunshine days in September - Annapolis, CA
  • Average sunshine days in September: 27.1 days

The months with the most sunshine days are July and August (29.6 days).
The month with the least sunshine days is March (14.6 days).

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Average UV index in September
Annapolis, CA

Average UV index in September - Annapolis, 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 February, November and December (UV index 3).

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Average cloud cover in September
Annapolis, CA

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

The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 6).

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Average visibility in September
Annapolis, CA

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

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