Waltham, MA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Waltham, a city in Middlesex County, Massachusetts.
This Afternoon
73°F
Mostly Cloudy
Mostly cloudy. High near 73, with temperatures falling to around 64 in the afternoon. Southwest wind around 6 mph.
7-day forecast for Waltham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Cloudy | 6 mph SW | 2% |
| Tonight | 51°F | Mostly Cloudy | 5 mph SW | 4% |
| Wednesday | 77°F | Mostly Sunny | 5 to 9 mph SW | 5% |
| Wednesday Night | 55°F | Partly Cloudy | 7 mph SW | 3% |
| Thursday | 75°F | Mostly Cloudy then Slight Chance Light Rain | 6 to 12 mph SW | 15% |
| Thursday Night | 62°F | Mostly Cloudy then Chance Light Rain | 5 to 8 mph SW | 54% |
| Friday | 70°F | Rain | 6 mph S | 84% |
| Friday Night | 56°F | Rain | 5 mph SW | 85% |
| Saturday | 64°F | Light Rain Likely | 7 mph NW | 74% |
| Saturday Night | 44°F | Chance Light Rain | 6 mph NW | 48% |
| Sunday | 60°F | Chance Light Rain then Mostly Sunny | 5 to 8 mph W | 25% |
| Sunday Night | 38°F | Partly Cloudy | 5 mph W | 10% |
| Monday | 58°F | Slight Chance Light Rain | 6 to 10 mph W | 20% |
| Monday Night | 37°F | Slight Chance Light Rain | 8 mph W | 20% |
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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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 Nov 3, 2026.