Harwich Temperature by Month

Harwich in Cape Cod, United States of America sees significant seasonal temperature differences, with daytime highs between 4°C (39°F) in February and 26°C (79°F) in July, averaging 15°C (59°F) annually. Explore the full monthly breakdown below.

Visitors to Harwich can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 19°C (66°F) in July to -4°C (25°F) in February.

The chart below illustrates the average maximum day and minimum night temperatures in Harwich by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. July, the warmest month, gets 301 hours of sunshine.

The chart below shows the average temperature throughout the year:

Harwich's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Chicago, USA averages 15°C (59°F) annually, known for extreme seasonal swings, from bitterly cold winters to warm summers.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Harwich this rarely lasts long on the ground.

For more on Harwich's weather, including monthly rainfall, sunshine hours, and humidity, visit our Harwich climate page.