Boston Weather in October
Boston, Massachusetts enjoys mild weather in October with days of moderate temperatures and clear skies. While relatively few days this month have rain, several days usually do get a good drenching.
This page gives detailed information on the typical October temperature, precipitation, sun, humidity, wind and storms for Boston. The numbers here are historical averages based on climate data gathered at Boston's Logan International Airport, located on the waterfront next to Boston Harbor.
|62 °F||October average high||17 °C|
|48 °F||October average low||9 °C|
|19 days||60 °F max. or more (16 °C)|
|20 days||50 °F min. or less (10 °C)|
Nearly every October day warms to over 50 degrees Fahrenheit (10 degrees Celsius) in Boston. The city averages just 1 day this month when the thermometer reaches into the 80s °F (over 27 °C). Temperatures above 90 °F (32 °C) are not expected here during October.
This month the thermometer dips to 40 °F (4 °C) or below on an average of five nights. October can drop below freezing, but that doesn't happen most years.
|4.0 in||total precipitation||102 mm|
|11 days||of rain|
Half the time, Boston receives 1.9 to 5.3 inches (49 to 135 mm) of rainfall in October. One in four years has drier weather, while another one in four is wetter. About once a decade, some of the precipitation falls as snow.
|11 days||clear skies|
The sun's rays reach the ground in Boston during 60 percent of daylight hours on average in October, for a total of 205 hours in the month.
October has more cloudless days than other months in Boston. Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in October at Boston lasts for 11 hours and 1 minute a day on average. The longest day of the month is the 1st with 11 hours and 43 minutes of daylight. By the end of the month, the days have shortened to 10:22 from sunrise to sunset. These durations can vary by a minute or two from year to year.
|69 %||October average humidity|
The relative humidity in Boston during October usually peaks at 78 percent in the morning then drops to 57 percent by early afternoon.
|Local Time||1 am||4 am||7 am||10 am||1 pm||4 pm||7 pm||10 pm|
|11.8 mph||October wind speed average||19.0 kph|
October is a little less windy than most other months in Boston.
|3 days||rainfall of 0.5 inches (13 mm) or more|
|1 day||with thunderstorms in October|
|2 %||chance a named storm approaches|
An October thunderstorm happens in most, but not all, years.
While there's a two percent probability that a named tropical storm will approach within 100 miles (165 km) of Boston during October, it's unlikely that any storm in the area will be as severe as a hurricane.
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.