Hyannis, Cape Cod weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Good
Best time to visit: July – August
What is the weather like in Hyannis, Cape Cod in July?
In July, Hyannis, Cape Cod is warm: daytime highs average 23 °C, and nights cool down to about 20 °C. The sea averages 19.9 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain falls on about 9 days, adding up to 70 mm. The air is often humid and muggy. All in all, July is a good month for a holiday in Hyannis, Cape Cod.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 14 h 56 min05:19 – 20:15
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 18 daysdew point 18 °C or moreAll months
- Wind
- 22 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %72 %
- Seaweight 25 %41 %
- Sunshineweight 20 %87 %
- Few rainy daysweight 20 %67 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in July
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Insect repellent
- Rain jacket or umbrella
Hyannis, Cape Cod in July: quick answers
Is Hyannis, Cape Cod hot in July?
Warm rather than hot: in July, daytime highs in Hyannis, Cape Cod average 23 °C and nights cool to about 20 °C.
Can you swim in Hyannis, Cape Cod in July?
Only if you don't mind cold water: in July the sea averages just 19.9 °C. Comfortable swimming is possible in August.
Does it rain much in Hyannis, Cape Cod in July?
Rain falls on about 9 days, adding up to 70 mm.
Hyannis, Cape Cod month by month
The whole year in Hyannis, Cape CodAll destinations: USAWhere to go in JulySea temperature in July
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences