Waltham (MA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Waltham.
Climate overview of Waltham
Waltham, Massachusetts, United States of America, sees big temperature differences between seasons, with July peaking at 29°C (84°F) and February dropping to 2°C (36°F).
Rain/snowfall is high, totalling around 1220 mm (48 in) per year. December is the wettest month and September the driest. The most sunshine falls in May, with an average of 10.0 hours of daily sunshine.
Waltham Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Waltham — and find the best time to visit.
Monthly Temperature in Waltham
Visitors to Waltham can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 29°C (84°F) in July, the warmest time of the year, to a chilly 2°C (36°F) during cooler months like February.
At night, you can expect temperatures ranging from 17°C (63°F) in July to around -8°C (18°F) during February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Waltham
Waltham is known for its substantial rain/snowfall, with annual precipitation reaching 1220 mm (48 in). Year-round, Waltham has a balanced climate with minimal variation in precipitation. The difference between the wettest month, December, with 129 mm (5.1 in), and the driest month, September, with 83 mm (3.3 in), is minimal. For more details, please visit our Waltham 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 Waltham
Seasonal changes in sunshine hours are quite dramatic in Waltham. While May receives considerable daily sunshine with up to 10.0 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.7 hours of sunlight per 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 Waltham
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 Waltham by Month
The relative humidity is high throughout the year in Waltham.
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 Waltham
The mean wind speed over the year ranges from 5 m/s (10 knots) in June, July, August and September to 7 m/s (14 knots) in January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Waltham
The weather does bring rainfall during this period, between 83 mm (3.3 in) and 126 mm (5 in). Seeking the perfect travel destination for this year? We've created a tool that suggests locations matching your desired weather. Let our weather planner guide your travel decisions.
Frequently asked questions about the climate in Waltham
What is the best time to visit Waltham?
May, August and September typically offer the most optimal weather in Waltham. In contrast, January, February, March and December tend to have less optimal conditions.
What temperatures can I expect in Waltham?
Daytime highs range from 2°C (36°F) in February 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 Waltham get?
Annual rainfall is around 1220 mm (48 in). December is the wettest month with 129 mm (5.1 in), while September is the driest with 83 mm (3.3 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Waltham?
Waltham 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, Waltham enjoys abundant sunshine.
Waltham 3-Day Forecast
Waltham (MA) 3-Day Forecast
Waltham on the map
Waltham is highlighted — select any city to see its climate.
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