The best times to visit Harwich for ideal weather are

May 14th to October 21st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Harwich Travel Info

Weather in Harwich

Temperature

Average temperatures in Harwich vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 33rd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Harwich, the hottest months are July, August, and then September. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 81°F (27.2°C) with temperatures rarely dropping below 66.7°F (19.3°C) at night.

Harwich Temperatures (Fahrenheit)

Key
High
Average
Low

Harwich Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Harwich Perceived Temperature (F)

Key
High
Average
Low

Harwich Perceived Temperature (C)

Key
High
Average
Low

 

Average Harwich Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 39.3 32.2 25.2
Feb 39.4 32 25
Mar 44.9 37.8 31.1
Apr 54.4 46.7 40.1
May 63.9 55.8 49.4
Jun 72.2 64.1 57.5
Jul 79.9 71.9 65.4
Aug 78.6 70.5 63.6
Sep 72.5 65.1 58.2
Oct 62.8 55.6 48.6
Nov 53.1 46.1 39
Dec 46.2 38.9 31.8

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 4.1 0.1 -3.8
Feb 4.1 0 -3.9
Mar 7.2 3.2 -0.5
Apr 12.4 8.2 4.5
May 17.7 13.2 9.7
Jun 22.3 17.8 14.2
Jul 26.6 22.2 18.6
Aug 25.9 21.4 17.6
Sep 22.5 18.4 14.6
Oct 17.1 13.1 9.2
Nov 11.7 7.8 3.9
Dec 7.9 3.8 -0.1

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Harwich are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid to late September. For example, on the week of September 17th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late December with an average of 3 days of significant precipitation the week of December 24th.

When can you find snow in Harwich? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Harwich.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Harwich (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 28% 0 3.8
Feb 26% 0 3.8
Mar 29% 0 4.3
Apr 23% 0 3.7
May 19% 0 3
Jun 20% 0 3
Jul 16% 0 3.6
Aug 16% 0 3
Sep 16% 0 3.3
Oct 24% 0 4.5
Nov 22% 0 4.4
Dec 35% 0 5.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 28 0 9.7
Feb 26 0 9.7
Mar 29 0 10.9
Apr 23 0 9.4
May 19 0 7.6
Jun 20 0 7.6
Jul 16 0 9.1
Aug 16 0 7.6
Sep 16 0 8.4
Oct 24 0 11.4
Nov 22 0 11.2
Dec 35 0 13.2

 

Humidity and Wind

Harwich has some very humid months, with other comfortably humid months. The least humid month is February (58.5% relative humidity), and the most humid month is July (74.2%).

Wind in Harwich is usually calm. The windiest month is March, followed by April and February. March’s average wind speed of around 7.2 knots (8.2 MPH or 13.3 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early March where average top sustained speeds reach 13.3 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Harwich.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 6.3 Light breeze 12.1 Significant breeze
Feb 6.6 Light breeze 12.7 Significant breeze
Mar 7.2 Gentle breeze 12.9 Significant breeze
Apr 6.9 Light breeze 12.6 Significant breeze
May 6.2 Light breeze 11.3 Significant breeze
Jun 5.7 Light breeze 10.6 Gentle breeze
Jul 5.4 Light breeze 10.1 Significant breeze
Aug 4.9 Light breeze 9.8 Gentle breeze
Sep 5.4 Light breeze 10.5 Significant breeze
Oct 5.8 Light breeze 11.2 Significant breeze
Nov 6.2 Light breeze 11.4 Significant breeze
Dec 6.5 Light breeze 12.1 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 60.4%
Feb 58.5%
Mar 60.7%
Apr 62.6%
May 69.7%
Jun 73.3%
Jul 74.2%
Aug 73.3%
Sep 71.9%
Oct 69.5%
Nov 65.4%
Dec 67%

 

Is it Safe to Travel to Harwich?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Harwich, MA, US is July, followed by August and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Harwich in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 51.6 in December means 51.6% of the tourists vs. July.

 

 

Overall Harwich Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 69.2°F (20.7°C) and 40.5°F (4.7°C) with warmer temperatures in the later months. Rain is somewhat common with 6 to 9 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the least precipitation with 5 to 6 days of precipitation per month. June – August is the busiest season for tourism in Harwich, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 76.4°F (24.7°C) and 49.8°F (9.9°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 5 to 7 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is far too cold this time of year in Harwich to be enjoyable for warm weather travelers. The average high during this season is between 47.6°F (8.7°C) and 36°F (2.2°C). On average, it rains or snows a fair amount: 7 to 11 times per month. These times of year are the slowest with tourists.

 

Best Times to Travel› the United States › Harwich, MA, US