Weather WorldSouth Waltham, MA 7-Day Night Weather Forecast
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South Waltham, MA Weather Forecast
South Waltham, MA Weather Forecast Date: 404 AM EDT Mon Aug 17 2026
The area/counties/county of: Southeast Middlesex County Ma, including the city of Cambridge.or toggle through each period.
Today... Mostly cloudy. Showers likely, mainly this morning. Patchy fog. Highs in the mid 70s. South winds 5 to 10 mph, becoming southeast this afternoon. Chance of rain 60%.
Tonight... Mostly cloudy. A chance of showers, mainly in the evening. Patchy fog. Humid with lows in the mid 60s. North winds around 5 mph. Chance of rain 30%.
Tuesday... Mostly cloudy in the morning, then becoming partly sunny. Patchy fog in the morning. Humid with highs in the lower 80s. North winds around 5 mph.
Tuesday Night... Partly cloudy. Humid with lows in the mid 60s. East winds around 5 mph in the evening, becoming light and variable.
Wednesday... Sunny with highs in the upper 80s. Southwest winds around 5 mph.
Wednesday Night... Mostly clear. Lows in the upper 60s.
Thursday... Partly cloudy. A 30% chance of showers. Highs in the mid 80s. Lows in the lower 60s.
Thursday Night... Partly cloudy. A 30% chance of showers. Highs in the mid 80s. Lows in the lower 60s.
Friday... Partly cloudy. Highs in the lower 80s. Lows in the lower 60s.
Friday Night... Partly cloudy. Highs in the lower 80s. Lows in the lower 60s.
Saturday... Partly sunny with a 30% chance of showers. Highs in the upper 70s.
Saturday Night... Mostly cloudy with a 40% chance of showers. Lows in the lower 60s.
POP = Probability of Precipitation
South Waltham Radar Loop
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