September weather forecast and climate
Jamestown, NY

Weather in September

September, the first month of the autumn, in Jamestown, is still a pleasant month, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 53.1°F (11.7°C).

Temperature

In Jamestown, the average high-temperature in September is essentially the same as in August - a pleasant 69.4°F (20.8°C). In September, the average low-temperature is 53.1°F (11.7°C).

Humidity

Months with the lowest humidity are April, May and September, with an average relative humidity of 81%.

Rainfall

September is the month with the least rainfall in Jamestown. Rain falls for 14.3 days and accumulates 1.81" (46mm) of precipitation.

Snowfall

In Jamestown snow does not fall in June through September.

Daylight

The average length of the day in Jamestown is 12.5h.

Sunshine

In Jamestown, the average sunshine is 8.6h.

UV index

In September, the average daily maximum UV index in Jamestown is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 3 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.
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FAQ

What is the temperature in September in Jamestown?

The average high-temperature, in September, is 69.4°F (20.8°C), while the average low-temperature is 53.1°F (11.7°C).

What are the least humid months in Jamestown?

April, May and September, with an average relative humidity of 81%, are the least humid months in Jamestown.

What is the average humidity in September in Jamestown?

The average relative humidity in September is 81%.

How many days does it rain in September in Jamestown?

In September, in Jamestown, the rain falls for 14.3 days. Throughout September, 1.81" (46mm) of precipitation is accumulated.

What is the driest month in Jamestown?

September is the month with the least rainfall in Jamestown, New York. Rain falls for 14.3 days and accumulates 1.81" (46mm) of precipitation.

Does it snow in Jamestown in September?

In Jamestown, New York, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Jamestown?

In Jamestown snow does not fall in June through September.

How many hours of daylight does Jamestown have in September?

In September, the average length of the day in Jamestown, New York, is 12.5h.

How many hours of sunshine does Jamestown have in September?

In Jamestown, New York, the average sunshine in September is 8.6h.

What is the UV index intensity in September in Jamestown?

In September, the average daily maximum UV index in Jamestown is 3. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Jamestown, NY

Average temperature in September - Jamestown, NY
  • Average high temperature in September: 69.4°F

The warmest month (with the highest average high temperature) is July (75.9°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in September: 53.1°F

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).

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Average pressure in September
Jamestown, NY

Average pressure in September - Jamestown, NY
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.1").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Jamestown, NY

Average wind speed in September - Jamestown, NY
  • Average wind speed in September: 7.1mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in September
Jamestown, NY

Average humidity in September - Jamestown, NY
  • Average humidity in September: 81%

The month with the highest relative humidity is February (89%).
Months with the lowest relative humidity are April, May and September (81%).

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Average rainfall in September
Jamestown, NY

Average rainfall in September - Jamestown, NY
  • Average rainfall in September: 1.81"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in September
Jamestown, NY

Average rainfall days in September - Jamestown, NY
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is January (6.9 days).

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Average snowfall in September
Jamestown, NY

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

The month with the highest snowfall is December (7.68").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Jamestown, NY

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

The month with the highest number of snowfall days is January (20.7 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Jamestown, NY
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.6h

Months with the most sunshine are July and August (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 2.3h).

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Average sunshine days in September
Jamestown, NY

Average sunshine days in September - Jamestown, NY
  • Average sunshine days in September: 12.5 days

The month with the most sunshine days is September (12.5 days).
The month with the least sunshine days is January (5.6 days).

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Average UV index in September
Jamestown, NY

Average UV index in September - Jamestown, NY
  • Average UV index in September: 3

Months with the highest UV index are May, June, July and August (UV index 5).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Jamestown, NY

Average cloud cover in September - Jamestown, NY
  • Average cloud cover in September: 37

The month with the most cloud cover is January (Cloud cover 79).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Jamestown, NY

Average visibility in September - Jamestown, NY
  • Average visibility in September: 6mi

Months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (4mi).

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