Dedham (MA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Dedham.
Climate overview of Dedham
Temperatures in Dedham, Massachusetts, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at 3°C (37°F).
The city has a wet climate, receiving around 1268 mm (50 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. December is the wettest month. Sunshine peaks in May, when the city sees around 10.0 hours of sunshine per day.
Dedham Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Dedham - and find the best time to visit.
Monthly Temperature in Dedham
The climate in Dedham is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a chilly 3°C (37°F) in January.
Nighttime temperatures range from 17°C (63°F) in July to -8°C (18°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Dedham
Dedham has a notably wet climate with abundant precipitation, recording 1268 mm (50 in) of rain/snowfall per year. The amount of precipitation varies moderately throughout the year. The wettest month, December, sees around 132 mm (5.2 in) of snow/rainfall, perfect for those who enjoy a bit of snow/rain now and then. The driest month, September, still receives a respectable 79 mm (3.1 in) of rainfall. For more details, please visit our Dedham 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 Dedham
In Dedham, summer days are longer and more sunny, with daily sunshine hours peaking at 10.0 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Dedham
The mean water temperature over the year ranges from 4°C (39°F) in February to 20°C (68°F) in August.
Water temperature over the year
Humidity in Dedham by Month
The relative humidity is high throughout the year in Dedham.
The city experiences its highest humidity in August, reaching 72%. In February, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Dedham
The mean wind speed varies between 5 m/s (10 knots) and 7 m/s (14 knots) throughout the year. It is lowest in June, July, August and September and highest during January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Dedham
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, July and September
- Warmest weather: July and August
- Most sunshine: May and July
- Fewer rainy days: February, March, August, September and November
- Best for swimming: August, with water temperatures around 20°C (68°F).
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -8°C (18°F).
Frequently asked questions about the climate in Dedham
What is the best time to visit Dedham?
May, July and September typically offer the most optimal weather in Dedham. In contrast, January, February, March, November and December tend to have less optimal conditions. Dedham has warm summers and cold winters.
What temperatures can I expect in Dedham?
Daytime highs range from 3°C (37°F) in January to 29°C (84°F) in July. Nighttime lows range from -8°C (18°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Dedham get?
Annual rainfall is around 1268 mm (50 in). December is the wettest month with 132 mm (5.2 in), while September is the driest with 79 mm (3.1 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Dedham?
Dedham receives around 2,665 hours of sunshine per year. May is the sunniest month with 301 hours, while December is the cloudiest with just 141 hours. Overall, Dedham enjoys abundant sunshine.
Dedham 3-Day Forecast
Dedham on the map
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