Waltham, MA Weather & Growing Conditions
Today
84°F
Sunny
Sunny, with a high near 84. West wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 6 mph W | 0% |
| Tonight | 61°F | Partly Cloudy | 5 mph SW | 1% |
| Wednesday | 84°F | Mostly Sunny | 1 to 6 mph W | 1% |
| Wednesday Night | 66°F | Partly Cloudy | 5 mph SW | 6% |
| Thursday | 87°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 7 mph SW | 21% |
| Thursday Night | 71°F | Chance Rain Showers then Partly Cloudy | 6 mph SW | 27% |
| Friday | 89°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 7 mph SW | 19% |
| Friday Night | 70°F | Chance Rain Showers then Partly Cloudy | 2 to 6 mph W | 27% |
| Saturday | 87°F | Mostly Sunny then Chance Rain Showers | 2 to 6 mph W | 31% |
| Saturday Night | 69°F | Chance Rain Showers | 5 mph W | 42% |
| Sunday | 88°F | Mostly Sunny | 2 to 7 mph W | 12% |
| Sunday Night | 70°F | Mostly Clear | 3 to 7 mph SW | 14% |
| Monday | 88°F | Sunny | 3 to 9 mph SW | 10% |
| Monday Night | 68°F | Mostly Clear | 8 mph W | 12% |
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 (3.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.