Waltham, MA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Middlesex County, Massachusetts.

Tonight

47°F

Partly Cloudy

Partly cloudy, with a low around 47. North wind 5 to 8 mph.

7-day forecast for Waltham

When	Temp	Forecast	Wind	Precip
Tonight	47°F	Partly Cloudy	5 to 8 mph N	0%
Saturday	64°F	Sunny	5 mph NE	0%
Saturday Night	45°F	Partly Cloudy	1 to 5 mph SE	1%
Sunday	64°F	Rain Showers Likely	1 to 6 mph SE	74%
Sunday Night	55°F	Rain Showers	2 to 7 mph NE	83%
Monday	65°F	Chance Rain Showers then Partly Sunny	9 mph NE	33%
Monday Night	51°F	Partly Cloudy	3 to 8 mph NE	6%
Tuesday	60°F	Partly Sunny	10 mph NE	6%
Tuesday Night	50°F	Mostly Cloudy	5 to 8 mph NE	3%
Wednesday	61°F	Partly Sunny	9 to 13 mph NE	6%
Wednesday Night	49°F	Mostly Cloudy then Slight Chance Rain Showers	7 to 10 mph NE	17%
Thursday	60°F	Chance Rain Showers	12 mph NE	29%
Thursday Night	50°F	Chance Rain Showers	7 to 10 mph NE	38%
Friday	63°F	Chance Rain Showers	10 mph N	37%

Forecast source: National Weather Service (api.weather.gov) for Waltham (42.389, -71.242). Updated through the day.

Growing snapshot for Waltham

Last spring frost

Apr 28

First fall frost

Oct 10

Growing season

165 days

Hardiness zone

More local growing data for Waltham: nearby ZIP 02451 weather · frost dates · planting calendar · Massachusetts frost dates

Nearby towns & communities

Arlington Ayer Belmont Burlington Cochituate East Pepperell Everett Framingham Groton Hanscom AFB Hopkinton Hudson Lexington Littleton Common Lowell Malden Marlborough Maynard Medford Melrose Newton Pepperell Pinehurst Reading Shirley Somerville Stoneham Townsend Wakefield Watertown Town

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Climate data from the nearest NOAA station, Bedford Hanscom Fld, Ma (5.1 mi from Waltham). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.