October Weather in Groton, United States

Last updated: June 24, 2025

In October, the average temperature in Groton, United States hovers around 8°C (46°F), with a minimum drop to -16°C (4°F) and a maximum rise to 28°C (83°F). Prepare for a sprinkling of rain, as the area receives approximately 76 mm (3.0 in) of precipitation over about 7 days. The humidity lingers at a comfortable 76%, creating a unique atmosphere throughout the month.

October Temperature in Groton

In October in Groton, the average temperature is 8°C (46°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -16°C (4°F). Be prepared for a wide range of weather conditions when traveling during this time.

October Weather in Groton: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Groton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Groton, October typically has an average temperature of 8°C (46°F), with highs reaching up to 28°C (83°F) and lows dropping to around -16°C (4°F).

Data source: Temperature data for Groton generated using information from the Copernicus Climate Change Service.

October Precipitation in Groton

In Groton in October, the precipitation amount is 76 mm (3.0 in) over a period of 7 days.

October Precipitation Trends in Groton

The chart displays monthly precipitation patterns in Groton, 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 Groton, October typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Groton

In Groton in October, humidity is 76%. With an average temperature of 8°C (46°F), this humidity feels like a chilly dampness that seeps into your bones, making travel less enjoyable as the cold air mixes with the moisture, creating an uneasy, heavy atmosphere that can hinder your outdoor plans.

October Average Humidity in Groton

This chart illustrates the average monthly humidity levels in Groton, 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 Groton is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Groton

In Groton in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Groton.

Maximum UV Index Levels in Groton for October

The chart shows the monthly maximum UV Index (UVI) for Groton 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 Groton typically reaches 5, which falls under the moderate exposure category.

Data source: Groton 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 Groton Compares to Other Months

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

This table compares monthly weather conditions in Groton, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	18 mm (0.7 inches)	81%	moderate
February Weather	-10°C (14°F)	16 mm (0.6 inches)	85%	moderate
March Weather	-1°C (31°F)	35 mm (1.4 inches)	76%	moderate
April Weather	5°C (41°F)	47 mm (1.9 inches)	79%	high
May Weather	14°C (57°F)	64 mm (2.5 inches)	76%	very high
June Weather	22°C (71°F)	65 mm (2.6 inches)	81%	very high
July Weather	24°C (75°F)	76 mm (3.0 inches)	82%	very high
August Weather	21°C (71°F)	108 mm (4.2 inches)	82%	very high
September Weather	17°C (63°F)	88 mm (3.5 inches)	77%	high
October Weather	8°C (46°F)	76 mm (3.0 inches)	76%	moderate
November Weather	0°C (33°F)	17 mm (0.7 inches)	84%	moderate
December Weather	-5°C (23°F)	33 mm (1.3 inches)	81%	low