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October Weather in Somerville, United States

Last updated: June 24, 2025

In October, the average temperature in Somerville, United States hovers around 18°C (65°F). Temperatures can range from a chilly 1°C (34°F) to a sweltering 36°C (97°F). Expect 105 mm (4.1 in) of precipitation over about 8 days, accompanied by an average humidity of 73%. Stay prepared for a mix of weather conditions!

October Temperature in Somerville

In October in Somerville, the average temperature is 18°C (65°F). Maximums can reach 36°C (97°F), and minimums can be as low as 1°C (34°F). This variation in temperature makes it essential to pack accordingly for your travels.

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

The chart illustrates October temperature patterns in Somerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerville, October typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (97°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec424655617178817975645047
Data source: Temperature data for Somerville 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 Somerville

In Somerville in October, the precipitation amount is 105 mm (4.1 in) over the course of 8 days.

October Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, 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 Somerville, October typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec10017216513510510912511411510575145
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Somerville

In Somerville in October, humidity is 73%. With an average temperature of 18°C (65°F), this humidity feels like a warm, slightly muggy embrace that can make exploring the outdoors a bit sticky, yet still pleasant for leisurely strolls and sightseeing.

October Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, 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 Somerville is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Somerville

In Somerville in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Somerville.

Maximum UV Index Levels in Somerville for October

The chart shows the monthly maximum UV Index (UVI) for Somerville 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 Somerville typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
Data source: Somerville 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 Somerville Compares to Other Months

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

This table compares monthly weather conditions in Somerville, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)100 mm (4.0 inches)86%moderate
February Weather8°C (46°F)172 mm (6.8 inches)85%high
March Weather13°C (55°F)165 mm (6.5 inches)84%very high
April Weather16°C (61°F)135 mm (5.3 inches)81%very high
May Weather22°C (72°F)105 mm (4.1 inches)83%extreme
June Weather26°C (78°F)109 mm (4.3 inches)83%extreme
July Weather27°C (81°F)124 mm (4.9 inches)80%extreme
August Weather26°C (79°F)114 mm (4.5 inches)73%very high
September Weather24°C (76°F)114 mm (4.5 inches)70%very high
October Weather18°C (65°F)105 mm (4.1 inches)73%high
November Weather10°C (51°F)75 mm (2.9 inches)85%moderate
December Weather8°C (47°F)145 mm (5.7 inches)88%moderate

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