September weather forecast
Ithaca, NY

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A stream of water flowing downstream from the Taughannock Waterfall in Ithaka, New York
A stream of water flowing downstream from the Taughannock Waterfall in Ithaka, New York

Weather in September

September sees a considerable reduction in temperature from August, signifying the arrival of the fall season in Ithaca. Rainfall reduces to 2.52" (64mm), and the landscape is filled with autumn foliage. The weather remains pleasant with a crisp breeze, foreshadowing the approaching cooler months.

Temperature

The beginning of September in Ithaca brings a slight decrease in the average high-temperature, transitioning from a moderately hot 76.5°F (24.7°C) in August to a pleasant 70°F (21.1°C). Ithaca's average low-temperature for the month of September records at a fresh 50.7°F (10.4°C).

Humidity

In Ithaca, New York, the average relative humidity in September is 81%.

Rainfall

In September, the rain falls for 13.6 days. Throughout September, 2.52" (64mm) of precipitation is accumulated. Throughout the year, there are 164.2 rainfall days, and 32.56" (827mm) of precipitation is accumulated.

Snowfall

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

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of September in Ithaca, sunrise is at 6:31 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:48 pm EDT.

Sunshine

In Ithaca, the average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September in Ithaca is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 3 suggests these recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Updated: Feb 13, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What is the usual temperature for Ithaca in September?

September temperatures in Ithaca vary between a high-temperature of 70°F (21.1°C) and a low-temperature of 50.7°F (10.4°C).

What is the average humidity in September in Ithaca?

In Ithaca, New York, the average relative humidity in September is 81%.

How many days does it rain in September in Ithaca?

In Ithaca, New York, during September, the rain falls for 13.6 days and regularly aggregates up to 2.52" (64mm) of precipitation.

When it does not snow in Ithaca?

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

Does it snow in Ithaca in September?

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

How many hours of daylight does Ithaca have in September?

In September, the average day length in Ithaca, New York, is 12h and 28min.

What time are sunrise and sunset in September in Ithaca?

On the first day of September in Ithaca, sunrise is at 6:31 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:48 pm EDT.

How many hours of sunshine does Ithaca have in September?

The average sunshine duration in September in Ithaca is 8.4h.

How high is the UV index in September in Ithaca?

The average daily maximum UV index in September in Ithaca, New York, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health 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
Ithaca, NY

Average temperature in September - Ithaca, NY
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in September: 50.7°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

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Average pressure in September
Ithaca, NY

Average pressure in September - Ithaca, NY
  • Average pressure in September: 30.06"Hg

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

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Average wind speed in September
Ithaca, NY

Average wind speed in September - Ithaca, NY
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average humidity in September
Ithaca, NY

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

The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are April and May (79%).

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Average rainfall in September
Ithaca, NY

Average rainfall in September - Ithaca, NY
  • Average rainfall in September: 2.52"

The wettest month (with the highest rainfall) is June (3.62").
The driest month (with the least rainfall) is November (1.97").

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Average rainfall days in September
Ithaca, NY

Average rainfall days in September - Ithaca, NY
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (6.4 days).

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Average snowfall in September
Ithaca, NY

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

The month with the highest snowfall is February (8.35").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Ithaca, NY

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

The month with the highest number of snowfall days is January (18.8 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
Ithaca, NY

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

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 2h and 30min).

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Average sunshine days in September
Ithaca, NY

Average sunshine days in September - Ithaca, NY
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is September (14.2 days).
The month with the least sunshine days is February (6.8 days).

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Average UV index in September
Ithaca, NY

Average UV index in September - Ithaca, 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
Ithaca, NY

Average cloud cover in September - Ithaca, NY
  • Average cloud cover in September: 41

The month with the most cloud cover is February (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 38).

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Average visibility in September
Ithaca, NY

Average visibility in September - Ithaca, NY
  • Average visibility in September: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).

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Ithaca, New York, USA

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