Waltham, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Middlesex County, Massachusetts.
Today
85°F
Sunny
Sunny, with a high near 85. West wind around 7 mph.
7-day forecast for Waltham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 7 mph W | 0% |
| Tonight | 62°F | Partly Cloudy | 2 to 6 mph SW | 2% |
| Wednesday | 85°F | Mostly Sunny | 2 to 7 mph W | 2% |
| Wednesday Night | 67°F | Partly Cloudy | 6 mph SW | 5% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 8 mph SW | 20% |
| Thursday Night | 72°F | Chance Rain Showers then Partly Cloudy | 7 mph SW | 25% |
| Friday | 90°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 8 mph SW | 21% |
| Friday Night | 71°F | Chance Rain Showers then Partly Cloudy | 3 to 7 mph W | 29% |
| Saturday | 88°F | Mostly Sunny then Chance Rain Showers | 3 to 7 mph W | 32% |
| Saturday Night | 70°F | Chance Rain Showers | 6 mph SW | 43% |
| Sunday | 89°F | Mostly Sunny | 3 to 8 mph W | 12% |
| Sunday Night | 71°F | Slight Chance Rain Showers then Mostly Clear | 5 to 8 mph SW | 15% |
| Monday | 89°F | Sunny | 5 to 10 mph SW | 10% |
| Monday Night | 70°F | Mostly Clear | 8 mph W | 12% |
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
6b
More local growing data for Waltham: nearby ZIP 02451 weather · frost dates · planting calendar · Massachusetts frost dates
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Watertown Town
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 Aug 4, 2026.