September weather forecast
Oswego, NY

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The colorful sun rising over a calm marina in Oswego, New York, with a view of numerous boats and yachts docked along several piers
The colorful sun rising over a calm marina in Oswego, New York, with a view of numerous boats and yachts docked along several piers

Weather in September

September’s arrival in Oswego ushers in the inevitable transition from summer to fall, with temperatures starting to dip noticeably. Despite seeing temperatures decline, the city records an average high of 68.9°F (20.5°C) - a remnant of the recent summer. September also showcases an abundance of sunshine, only slightly less than the peak summer months. Rain falls less heavily compared to August, simultaneously preparing the city for the drier autumn seasons ahead. As such, this month works as a bridge, orchestrating a harmonious shift from the retreating summer to the approaching fall.

Temperature

The arrival of September in Oswego coincides with an average high-temperature of a pleasant 68.9°F (20.5°C), indicating a minimal shift from August's 74.1°F (23.4°C). Throughout September nights, Oswego records a consistent low-temperature averaging a moderate 59.9°F (15.5°C).

Humidity

The months with the lowest humidity in Oswego are September and November, with an average relative humidity of 75%.

Rainfall

In Oswego, in September, during 14.8 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. In Oswego, during the entire year, the rain falls for 163 days and collects up to 37.83" (961mm) of precipitation.

Snowfall

In Oswego, snow does not fall in May through September.

Ocean temperature

In Oswego, the average seawater temperature in September is 68.5°F (20.3°C).
Note: A surface water temperature of 68.5°F (20.3°C) does not provide an enjoyable swimming experience for most. Breathing control becomes more challenging as the water temperature drops below 69.8°F (21°C).

Daylight

In Oswego, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:40 pm. On the last day of September, in Oswego, sunrise is at 7:03 am and sunset at 6:48 pm EDT.

Sunshine

The average sunshine in September in Oswego is 9.3h.

UV index

In September, the average daily maximum UV index in Oswego is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The UV index of 4 during September translates into the following guidance:
Exercise prevention - Warding off sunburn is urged. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
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Frequently asked questions

What is the temperature in September in Oswego?

In September, the average high-temperature and low-temperature are 68.9°F (20.5°C) and 59.9°F (15.5°C) respectively.

What are the least humid months in Oswego?

September and November, with an average relative humidity of 75%, are the least humid months in Oswego.

What is the average humidity in September in Oswego?

In September, the average relative humidity in Oswego is 75%.

How many days does it rain in September in Oswego?

In September, in Oswego, New York, the rain falls for 14.8 days. Throughout September, 2.72" (69mm) of precipitation is accumulated.

When it does not snow in Oswego?

May through September are months without snowfall in Oswego, New York.

Does it snow in Oswego in September?

In Oswego, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September in Oswego?

In September, the average ocean temperature in Oswego, New York, is 68.5°F (20.3°C). Swimming in 68.5°F (20.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

In Oswego, New York, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Oswego?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:40 pm. On the last day of the month, in Oswego, New York, sunrise is at 7:03 am and sunset at 6:48 pm EDT.

How long on average sun shines in September in Oswego?

In September, the average sunshine duration in Oswego, New York, is 9.3h.

How high is the UV index in September in Oswego?

In Oswego, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability 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
Oswego, NY

Average temperature in September - Oswego, NY
  • Average high temperature in September: 68.9°F

The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in September: 59.9°F

The months with the highest average low temperature are July and August (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

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Average pressure in September
Oswego, NY

Average pressure in September - Oswego, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Oswego, NY

Average wind speed in September - Oswego, NY
  • Average wind speed in September: 10.4mph

The windiest month (with the highest average wind speed) is January (15mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).

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Average humidity in September
Oswego, NY

Average humidity in September - Oswego, NY
  • Average humidity in September: 75%

The month with the highest relative humidity is June (83%).
The months with the lowest relative humidity are September and November (75%).

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Average rainfall in September
Oswego, NY

Average rainfall in September - Oswego, NY
  • Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is January (2.2").

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Average rainfall days in September
Oswego, NY

Average rainfall days in September - Oswego, NY
  • Average rainfall days in September: 14.8 days

The month with the highest number of rainy days is August (18.6 days).
The month with the least rainy days is February (6 days).

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Average snowfall in September
Oswego, NY

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

The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Oswego, NY

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

The month with the highest number of snowfall days is February (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Oswego, NY

Average sea temperature in September - Oswego, NY
  • Average sea temperature in September: 68.5°F

The best month for swimming (with the highest average sea temperature) is August (73.2°F).
The coldest month (with the lowest average sea temperature) is March (35.4°F).

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

Average daylight in September / Average sunshine in September - Oswego, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

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Average sunshine days in September
Oswego, NY

Average sunshine days in September - Oswego, NY
  • Average sunshine days in September: 13.7 days

The month with the most sunshine days is September (13.7 days).
The month with the least sunshine days is December (8.5 days).

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Average UV index in September
Oswego, NY

Average UV index in September - Oswego, NY
  • Average UV index in September: 4

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
Oswego, NY

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

The month with the most cloud cover is January (Cloud cover 79).
The months with the least cloud cover are July and August (Cloud cover 29).

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Average visibility in September
Oswego, NY

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

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

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Oswego, New York, USA

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