October Weather in Greenwich, United States

Last updated: June 24, 2025

In Greenwich, United States, the average temperature in October is 12°C (53°F), offering a refreshing climate. While the mercury can dip as low as -3°C (26°F), it can soar to a warm 27°C (80°F). The region sees 142 mm (5.6 in) of precipitation over approximately 13 days, contributing to an average humidity of 81%, which enhances the lushness of the surroundings.

October Temperature in Greenwich

In October in Greenwich, the average temperature is 12°C (53°F). Maximums can reach 27°C (80°F), while minimums can drop as low as -3°C (26°F). Pack for a variety of weather conditions to fully enjoy your trip!

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

The chart illustrates October temperature patterns in Greenwich, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greenwich, October typically has an average temperature of 12°C (53°F), with highs reaching up to 27°C (80°F) and lows dropping to around -3°C (26°F).

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

October Precipitation in Greenwich

In Greenwich in October, the precipitation amount is 142 mm (5.6 in) spread over 13 days.

October Precipitation Trends in Greenwich

The chart displays monthly precipitation patterns in Greenwich, 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 Greenwich, October typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 13 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Greenwich

In Greenwich in October, humidity is 81%. With an average temperature of 12°C (53°F), this humidity feels like a chilly dampness enveloping you, making outdoor activities uncomfortable and requiring layers to stay warm while you explore.

October Average Humidity in Greenwich

This chart illustrates the average monthly humidity levels in Greenwich, 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 Greenwich is approximately 81%, 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 Greenwich

In Greenwich 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 Greenwich.

Maximum UV Index Levels in Greenwich for October

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

Data source: Greenwich 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 Greenwich Compares to Other Months

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

This table compares monthly weather conditions in Greenwich, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (26°F)	77 mm (3.0 inches)	89%	moderate
February Weather	-2°C (29°F)	95 mm (3.8 inches)	88%	moderate
March Weather	2°C (35°F)	79 mm (3.1 inches)	86%	high
April Weather	8°C (47°F)	121 mm (4.8 inches)	84%	very high
May Weather	15°C (59°F)	89 mm (3.5 inches)	76%	very high
June Weather	20°C (68°F)	82 mm (3.2 inches)	72%	very high
July Weather	23°C (73°F)	108 mm (4.3 inches)	66%	very high
August Weather	22°C (72°F)	80 mm (3.2 inches)	64%	very high
September Weather	18°C (64°F)	87 mm (3.4 inches)	72%	high
October Weather	12°C (53°F)	142 mm (5.6 inches)	81%	moderate
November Weather	4°C (39°F)	106 mm (4.2 inches)	87%	moderate
December Weather	-1°C (31°F)	99 mm (3.9 inches)	84%	low