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South Waltham, MA Weather Forecast

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South Waltham, MA Weather Forecast

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South Waltham MA weather - Clear - 66°F
Clear
66°F
Updated 10:57 pm
Feels Like 73°F
Humidity 83%
Wind N 0 mph
Barometer  29.89 in
Dew Point 61°F
South Waltham MA weather - Clear - 19°C
Clear
19°C
Updated 10:57 pm
Feels Like 23°C
Humidity 83%
Wind N 0 km/h
Barometer  101.2 kPa
Dew Point 16°C
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South Waltham Weather Forecast

OVERNIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY TUESDAY WEDNESDAY
South Waltham, MA Weather - Overnight Mostly Clear South Waltham, MA Weather - Thursday Chance Of Showers South Waltham, MA Weather - Thursday Night Chance Of Showers South Waltham, MA Weather - Friday Mostly Sunny South Waltham, MA Weather - Friday Night Chance Of Showers South Waltham, MA Weather - Saturday Chance Of Showers South Waltham, MA Weather - Saturday Night Showers South Waltham, MA Weather - Sunday Chance Of Showers South Waltham, MA Weather - Sunday Night Chance Of Showers South Waltham, MA Weather - Monday Mostly Clear South Waltham, MA Weather - Tuesday Mostly Clear South Waltham, MA Weather - Wednesday Mostly Sunny
Mostly Clear Chance of Showers Chance of Showers Mostly Sunny Chance of Showers Chance of Showers Showers Chance of Showers Chance of Showers Mostly Clear Mostly Clear Mostly Sunny
Lo: 69°FLo: 21°C Hi: 85°FHi: 29°C
 Lo: 61°FLo: 16°C Hi: 80°FHi: 27°C
 Lo: 61°FLo: 16°C Hi: 79°FHi: 26°C
 Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 60°FLo: 16°C		 Hi: 81°FHi: 27°C
Lo: 60°FLo: 16°C		 Hi: 81°FHi: 27°C
POP: 20% POP: 30% POP: 40% POP: 50% POP: 60% POP: 50% POP: 50%
POP = Probability of Precipitation.
Weather Outlook Updated: 1004 PM EDT Wed Aug 19 2026 South Waltham, MA Weather - WeatherWorld.com

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South Waltham Forecast Discussion

Issued: 842 PM EDT Wed Aug 19 2026

Key Messages

  • Dry conditions through tonight. Unsettled weather returns Thursday with periods of showers.
  • Another round of unsettled weather possible for this weekend.

Discussion

... KEY MESSAGE 1...Dry conditions through tonight. Unsettled weather returns Thursday with periods of showers.

An upper level low slowly tracks across eastern Canada well to our north today and into Thursday. As it tracks eastward, it will induce troughing across the region accompanied by incre...