Dennis Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Dennis.
Climate overview of Dennis
Dennis, Cape Cod, United States of America, sees big temperature differences between seasons, with July peaking at 26°C (79°F) and February dropping to 4°C (39°F).
With around 1240 mm (49 in) of annual rain/snowfall, Dennis has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has warm summers and cold winters. The wettest month is December. Sunshine peaks in July, when the city sees around 10.0 hours of sunshine per day.
Dennis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Dennis - and find the best time to visit.
Monthly Temperature in Dennis
Visitors to Dennis can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 26°C (79°F) in July. In February, the coolest month of the year, temperatures drop to a chilly 4°C (39°F).
At night, temperatures range from around 19°C (66°F) in July to -4°C (25°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Dennis
Dennis is known for its substantial rain/snowfall, with annual precipitation reaching 1240 mm (49 in). Dennis experiences moderate seasonal variation in rainfall, with monthly averages ranging from 138 mm (5.4 in) in December, the wettest month, and 80 mm (3.1 in) in August, the driest month. For more details, please visit our Dennis Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Dennis
Dennis can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.0 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 4.9 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Dennis
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: July, August and September
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: February, with freezing nights around -4°C (25°F).
Frequently asked questions about the climate in Dennis
What is the best time to visit Dennis?
June, July, August and September typically offer the most optimal weather in Dennis. In contrast, January, February, March, November and December tend to have less optimal conditions. Dennis has warm summers and cold winters.
What temperatures can I expect in Dennis?
Daytime highs range from 4°C (39°F) in February to 26°C (79°F) in July. Nighttime lows range from -4°C (25°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Dennis get?
Annual rainfall is around 1240 mm (49 in). December is the wettest month with 138 mm (5.4 in), while August is the driest with 80 mm (3.1 in).
How sunny is Dennis?
Dennis receives around 2,605 hours of sunshine per year. July is the sunniest month with 301 hours, while January is the cloudiest with just 147 hours. Overall, Dennis enjoys abundant sunshine.
Dennis 3-Day Forecast
Dennis on the map
Dennis is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Kissimmee
33°C (91°F) Orlando33°C (91°F) Miami Beach32°C (90°F) Destin32°C (90°F) New York City
29°C (84°F) Big Bear Lake
27°C (81°F) Los Angeles
24°C (75°F) San Francisco22°C (72°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.