Cape Cod Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is on Cape Cod, Massachusetts during each month of the year.

The average high and low temperatures are listed below monthly and annually for Cape Cod, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 60, 70 or 80 °F each month at Cape Cod, scroll down farther. There are also monthly and yearly counts of days with cold weather.

All the numbers are averages, based on climate data gathered from 1981 to 2010 for Chatham and Hyannis.

Average Cape Cod temperatures
High °F Low °F   High °C Low °C
38 23 January 3 -5
40 24 February 4 -4
45 30 March 7 -1
53 39 April 12 4
62 48 May 17 9
72 57 June 22 14
78 63 July 26 17
77 63 August 25 17
71 56 September 21 13
61 46 October 16 8
53 38 November 11 3
43 29 December 6 -2
58 43 Year 14 6

Days of Hot Weather in Cape Cod

It seldom gets really hot on Cape Cod. In an average year, there's just one day of 90-degree weather and the thermometer never makes it to 100 °F.

Spells of 70 degrees Fahrenheit or more can happen from May to October. Cape Cod's warmest months, July and August, see nearly every day with temperatures in at least the 70s and most nights dropping into the 60s.

Average days per month that Cape Cod is at least 60, 70 or 80 °F
  60 °F
16 °C
70 °F
21 °C
80 °F
27 °C
January 0 0 0
February 0 0 0
March 1 0 0
April 4 0 0
May 19 5 1
June 28 18 3
July 31 29 11
August 31 28 9
September 29 17 1
October 18 3 0
November 5 0 0
December 0 0 0
Year 166 99 25

How Often Cape Cod Has Cold Temperatures

Freezing temperatures at night can happen at Cape Cod in seven months of the year, from October to April. Most winter nights there are below 33 degrees, though rarely down to zero Fahrenheit.

On average, 16 days a year have highs that remain below freezing. Weather this chilly is most common in Cape Cod during January, but can show up anytime from December to March.

Days per month on average on Cape Cod when the minimum temperature drops to 10, 20, or 32 °F or below
  10 °F
-12 °C
20 °F
-8 °C
32 °F
0 °C
January 3 12 25
February 1 8 23
March 0 3 18
April 0 0 4
May 0 0 0
June 0 0 0
July 0 0 0
August 0 0 0
September 0 0 0
October 0 0 1
November 0 0 8
December 1 5 20
Year 5 28 99
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Massachusetts Temperatures
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