September weather forecast
Jamestown, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Jamestown, California, with an average temperature varying between 58.8°F (14.9°C) and 85.1°F (29.5°C).

Temperature

In Jamestown, the average high-temperature in September gently drops from a tropical 90.9°F (32.7°C) in August to a warm 85.1°F (29.5°C). Jamestown's nighttime average of 58.8°F (14.9°C) during September reflects a substantial decrease from the daytime temperature.

Humidity

In Jamestown, the average relative humidity in September is 36%.

Rainfall

In Jamestown, in September, it is raining for 2.9 days, with typically 0.2" (5mm) of accumulated precipitation. In Jamestown, during the entire year, the rain falls for 76.7 days and collects up to 23.9" (607mm) of precipitation.

Snowfall

April through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm PDT.

Sunshine

The average sunshine in September 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 moderate health risk from unsafe exposure to UV radiation for average individuals.
Note: A maximum high daily UV index of 5 during September translates into the following directions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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Frequently asked questions

Is it hot in Jamestown during September?

An average high-temperature, in September, in Jamestown, is 85.1°F (29.5°C) and the average low-temperature is 58.8°F (14.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in June is calculated to be 82.4°F (28°C).

What is the average humidity in September in Jamestown?

In Jamestown, California, the average relative humidity in September is 36%.

How many days does it rain in September in Jamestown?

In September, in Jamestown, California, the rain falls for 2.9 days. Throughout September, 0.2" (5mm) of precipitation is accumulated.

When it does not snow in Jamestown?

In Jamestown, snow does not fall in April through October.

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

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

When is the sunrise / sunset in September in Jamestown?

On the first day of September in Jamestown, California, sunrise is at 6:32 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm PDT.

How many hours of sunshine does Jamestown have in September?

The average sunshine duration in September is 11.3h.

What is the UV index reading in September in Jamestown?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
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
Jamestown, CA

Average temperature in September - Jamestown, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in September: 58.8°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in September
Jamestown, CA

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

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Jamestown, CA

Average wind speed in September - Jamestown, CA
  • Average wind speed in September: 5mph

The windiest months (with the highest average wind speed) are February, March and April (5.7mph).
The calmest months (with the lowest average wind speed) are November and December (4.7mph).

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Average humidity in September
Jamestown, CA

Average humidity in September - Jamestown, CA
  • Average humidity in September: 36%

The month with the highest relative humidity is March (70%).
The month with the lowest relative humidity is July (32%).

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Average rainfall in September
Jamestown, CA

Average rainfall in September - Jamestown, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is March (4.76").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Jamestown, CA

Average rainfall days in September - Jamestown, CA
  • Average rainfall days in September: 2.9 days

The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is August (1.4 days).

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Average snowfall in September
Jamestown, CA

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

The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Jamestown, CA

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

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Jamestown, 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 36min).

  • 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).

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Average sunshine days in September
Jamestown, CA

Average sunshine days in September - Jamestown, CA
  • Average sunshine days in September: 26.6 days

The months with the most sunshine days are July and August (28.4 days).
The month with the least sunshine days is March (16.8 days).

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Average UV index in September
Jamestown, CA

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

The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in September
Jamestown, CA

Average cloud cover in September - Jamestown, CA
  • Average cloud cover in September: 7

The month with the most cloud cover is March (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in September
Jamestown, CA

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

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