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September Weather in Northwest Ithaca, United States

Last updated: June 24, 2025

In September, the average temperature in Northwest Ithaca, United States is a pleasant 17°C (64°F). Visitors can expect a range, with minimums dipping to 1°C (34°F) and daytime highs reaching up to 33°C (91°F). Prepare for some rain, as the area experiences about 91 mm (3.6 in) of precipitation over 9 days, coupled with an average humidity of 78%. Enjoy the comfortable yet variable weather as you explore!

September Temperature in Northwest Ithaca

In September in Northwest Ithaca, the average temperature is 17°C (64°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as 1°C (34°F). This varying climate makes it essential to pack layers for your travels to Northwest Ithaca.

September Weather in Northwest Ithaca: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Northwest Ithaca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Northwest Ithaca, September typically has an average temperature of 17°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec262834465866727063533931
Data source: Temperature data for Northwest Ithaca generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Northwest Ithaca

In Northwest Ithaca in September, the precipitation amount is 91 mm (3.6 in) spread over 9 days.

September Precipitation Trends in Northwest Ithaca

The chart displays monthly precipitation patterns in Northwest Ithaca, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Northwest Ithaca, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec82898511812795146100911509597
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Northwest Ithaca

In Northwest Ithaca in September humidity is 78%. With average temperature 17°C (64°F), this humidity feels like a warm embrace, making travel feel sticky and heavy, as the air wraps around you and the moments spent outdoors leave you longing for a cool respite.

September Average Humidity in Northwest Ithaca

This chart illustrates the average monthly humidity levels in Northwest Ithaca, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Northwest Ithaca is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Northwest Ithaca

In Northwest Ithaca in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Northwest Ithaca.

Maximum UV Index Levels in Northwest Ithaca for September

The chart shows the monthly maximum UV Index (UVI) for Northwest Ithaca in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Northwest Ithaca typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Northwest Ithaca September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Northwest Ithaca Compares to Other Months

Weather in Northwest Ithaca varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Northwest Ithaca, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Northwest Ithaca, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)82 mm (3.2 inches)90%moderate
February Weather-2°C (28°F)89 mm (3.5 inches)90%moderate
March Weather1°C (34°F)85 mm (3.4 inches)87%high
April Weather8°C (46°F)118 mm (4.6 inches)88%very high
May Weather14°C (58°F)127 mm (5.0 inches)82%very high
June Weather19°C (67°F)95 mm (3.7 inches)79%very high
July Weather22°C (72°F)146 mm (5.8 inches)78%very high
August Weather21°C (70°F)100 mm (3.9 inches)76%very high
September Weather17°C (64°F)91 mm (3.6 inches)78%very high
October Weather12°C (53°F)150 mm (5.9 inches)84%high
November Weather4°C (39°F)95 mm (3.7 inches)89%moderate
December Weather0°C (32°F)97 mm (3.8 inches)86%low

Compare Northwest Ithaca's Climate with Cities Worldwide