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October Weather in Stony Brook, United States

Last updated: June 24, 2025

In Stony Brook, United States, the average temperature in October hovers around 15°C (60°F). Expect minimums of 3°C (38°F) and maximums peaking at 31°C (89°F). During this month, you'll encounter approximately 129 mm (5.1 in) of precipitation over 11 days, with an average humidity of 74%. Embrace the varying weather, and don't forget your umbrella!

October Temperature in Stony Brook

In October in Stony Brook, the average temperature is 15°C (60°F). Maximums can reach 31°C (89°F) and minimums can be as low as 3°C (38°F). Overall, it's a great time to explore Stony Brook, but be prepared for both warm days and cooler evenings.

October Weather in Stony Brook: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Stony Brook, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stony Brook, October typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (89°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec343641505970777569604739
Data source: Temperature data for Stony Brook 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.

October Precipitation in Stony Brook

In Stony Brook in October, the precipitation amount is 129 mm (5.1 in) spread over 11 days, indicating a wet period for the area.

October Precipitation Trends in Stony Brook

The chart displays monthly precipitation patterns in Stony Brook, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Stony Brook, October typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec709995119110901321089212994119
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Stony Brook

In Stony Brook in October humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.

October Average Humidity in Stony Brook

This chart illustrates the average monthly humidity levels in Stony Brook, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Stony Brook is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Stony Brook

In Stony Brook in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Stony Brook, you can refer to this Hourly UV Index in Stony Brook.

Maximum UV Index Levels in Stony Brook for October

The chart shows the monthly maximum UV Index (UVI) for Stony Brook in October, 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 October, the maximum UV index in Stony Brook typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35681010998642
Data source: Stony Brook October 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 October Weather in Stony Brook Compares to Other Months

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

This table compares monthly weather conditions in Stony Brook, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)70 mm (2.8 inches)84%moderate
February Weather2°C (36°F)99 mm (3.9 inches)82%moderate
March Weather5°C (41°F)95 mm (3.8 inches)81%high
April Weather10°C (50°F)118 mm (4.7 inches)78%very high
May Weather15°C (60°F)110 mm (4.3 inches)69%very high
June Weather21°C (70°F)90 mm (3.5 inches)69%very high
July Weather25°C (77°F)132 mm (5.2 inches)62%very high
August Weather24°C (75°F)108 mm (4.3 inches)65%very high
September Weather21°C (69°F)92 mm (3.6 inches)68%very high
October Weather15°C (60°F)129 mm (5.1 inches)74%high
November Weather8°C (47°F)94 mm (3.7 inches)82%moderate
December Weather4°C (39°F)119 mm (4.7 inches)80%low

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