September weather forecast
Watertown, NY

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Weather in September

September in Watertown embodies the transition from summer warmth to the crispness of autumn. The city witnesses a substantial reduction in average temperature high to 69.1°F (20.6°C), signaling the end of summer. Autumn leaves begin to adorn the city, adding vibrant hues to the landscape. While sunny hours decrease, the weather remains reasonably warm and inviting. Granted the sporadic rainfall, September is an idyllic month that blends the best of summer and fall.

Temperature

In September, the meteorological conditions change slightly, with the average high-temperature moving from a warm 75.7°F (24.3°C) in August to an agreeable 69.1°F (20.6°C). Watertown temperatures generally rest at a low of 52.9°F (11.6°C) during the September nights.

Humidity

The months with the lowest humidity are April and September, with an average relative humidity of 77%.

Rainfall

The month with the least rainfall in Watertown is September, when the rain falls for 13 days and typically collects 1.81" (46mm) of precipitation.

Snowfall

In Watertown, snow does not fall in June through September.

Daylight

In September, the average length of the day is 12h and 30min.
On the first day of September, sunrise is at 6:27 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:45 pm EDT.

Sunshine

In Watertown, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 3 in September translates into this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
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Frequently asked questions

What is the usual temperature for Watertown in September?

The high-temperature during September is 69.1°F (20.6°C) and the low-temperature is 52.9°F (11.6°C).

What are the least humid months in Watertown?

April and September, with an average relative humidity of 77%, are the least humid months in Watertown.

What is the average humidity in September in Watertown?

The average relative humidity in September is 77%.

What is the driest month in Watertown?

September is the month with the least rainfall in Watertown, New York. Rain falls for 13 days and accumulates 1.81" (46mm) of precipitation.

How many days does it rain in September in Watertown?

In September, the rain falls for 13 days. Throughout September, 1.81" (46mm) of precipitation is accumulated.

When it does not snow in Watertown?

In Watertown, New York, snow does not fall in June through September.

Does it snow in Watertown in September?

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

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

In Watertown, the average day length in September is 12h and 30min.

When are sunrise and sunset in September in Watertown?

On the first day of September, sunrise is at 6:27 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:45 pm EDT.

How long on average sun shines in September in Watertown?

In September, the average sunshine duration in Watertown, New York, is 9.2h.

What is the UV index intensity in September in Watertown?

The average daily maximum UV index in September in Watertown is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe 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
Watertown, NY

Average temperature in September - Watertown, NY
  • Average high temperature in September: 69.1°F

The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is January (26.1°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).

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Average pressure in September
Watertown, NY

Average pressure in September - Watertown, NY
  • Average pressure in September: 30.04"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Watertown, NY

Average wind speed in September - Watertown, NY
  • Average wind speed in September: 7.4mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

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Average humidity in September
Watertown, NY

Average humidity in September - Watertown, NY
  • Average humidity in September: 77%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and September (77%).

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Average rainfall in September
Watertown, NY

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

The wettest month (with the highest rainfall) is October (3.54").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days in September
Watertown, NY

Average rainfall days in September - Watertown, NY
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is October (17.7 days).
The month with the least rainy days is February (7 days).

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Average snowfall in September
Watertown, NY

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

The month with the highest snowfall is January (10.47").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Watertown, NY

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

The month with the highest number of snowfall days is January (19.6 days).
The 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
Watertown, NY

Average daylight in September / Average sunshine in September - Watertown, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 2h and 42min).

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Average sunshine days in September
Watertown, NY

Average sunshine days in September - Watertown, NY
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is September (15.1 days).
The month with the least sunshine days is February (6.7 days).

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Average UV index in September
Watertown, NY

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Watertown, NY

Average cloud cover in September - Watertown, NY
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
Watertown, NY

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

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

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Watertown, New York, USA

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