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September Weather in Rensselaer, United States

Last updated: June 24, 2025

In September, the average temperature in Rensselaer, United States hovers around 21°C (69°F), providing a pleasant climate for visitors. Expect temperatures to range from a comfortable 5°C (41°F) to a warm 34°C (93°F). With approximately 69 mm (2.7 in) of precipitation spread over 8 days, you might want to pack an umbrella. The average humidity sits at a high 78%, adding a touch of tropical feel to your experience!

September Temperature in Rensselaer

In September in Rensselaer, the average temperature is 21°C (69°F). The maximum can reach 34°C (93°F), while the minimum can dip as low as 5°C (41°F). This makes it an ideal destination for travelers looking to enjoy a comfortable climate with a variety of temperature experiences.

September Weather in Rensselaer: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rensselaer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rensselaer, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec283041506373767469564134
Data source: Temperature data for Rensselaer 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 Rensselaer

In Rensselaer in September, the precipitation amount is 69 mm (2.7 in) that falls over a period of 8 days.

September Precipitation Trends in Rensselaer

The chart displays monthly precipitation patterns in Rensselaer, 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 Rensselaer, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7375102111161109109105691256958
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rensselaer

In Rensselaer in September, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

September Average Humidity in Rensselaer

This chart illustrates the average monthly humidity levels in Rensselaer, 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 Rensselaer is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rensselaer

In Rensselaer 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 Rensselaer.

Maximum UV Index Levels in Rensselaer for September

The chart shows the monthly maximum UV Index (UVI) for Rensselaer 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 Rensselaer typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Rensselaer 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 Rensselaer Compares to Other Months

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

This table compares monthly weather conditions in Rensselaer, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)73 mm (2.9 inches)85%moderate
February Weather-1°C (30°F)75 mm (2.9 inches)85%moderate
March Weather5°C (41°F)102 mm (4.0 inches)86%high
April Weather10°C (51°F)111 mm (4.4 inches)87%very high
May Weather17°C (63°F)161 mm (6.3 inches)81%very high
June Weather23°C (74°F)109 mm (4.3 inches)82%very high
July Weather25°C (76°F)108 mm (4.3 inches)81%very high
August Weather23°C (74°F)105 mm (4.2 inches)79%very high
September Weather21°C (69°F)69 mm (2.7 inches)78%very high
October Weather13°C (56°F)125 mm (4.9 inches)81%high
November Weather5°C (41°F)69 mm (2.7 inches)89%moderate
December Weather1°C (35°F)58 mm (2.3 inches)86%low

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