Waltham, MA Weather & Growing Conditions
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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Cloudy | 6 mph SW | 2% |
| Tonight | 51°F | Mostly Cloudy | 6 mph SW | 4% |
| Wednesday | 76°F | Mostly Sunny | 6 to 9 mph SW | 5% |
| Wednesday Night | 55°F | Partly Cloudy | 7 mph SW | 3% |
| Thursday | 74°F | Mostly Cloudy then Slight Chance Light Rain | 7 to 12 mph SW | 15% |
| Thursday Night | 62°F | Mostly Cloudy then Chance Light Rain | 8 mph SW | 53% |
| Friday | 70°F | Rain | 6 mph S | 84% |
| Friday Night | 56°F | Rain | 6 mph E | 84% |
| 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 | 6 mph W | 10% |
| Monday | 58°F | Slight Chance Light Rain | 6 to 10 mph W | 20% |
| Monday Night | 38°F | Slight Chance Light Rain | 8 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Waltham, MA
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
165 days
Hardiness zone
6b
Explore more for Waltham, MA: full frost dates · planting calendar · Massachusetts frost dates
Climate data from the nearest NOAA station, Bedford Hanscom Fld, Ma (5.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.