West Yarmouth (MA) Temperature by Month

West Yarmouth in Massachusetts, 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.

The weather in West Yarmouth experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 19°C (66°F) in July to -5°C (23°F) in February.

The chart below illustrates the average maximum day and minimum night temperatures in West Yarmouth 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:

West Yarmouth'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:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

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.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

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