Waltham, MA Weather Tomorrow

Stay one step ahead with tomorrow's weather in Waltham and a reliable 5 day forecast including precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction across the Waltham area and around Middlesex county, Massachusetts.
Updated: Tue Sep 8th 2026 1:45 AM EDT
Waltham, MA Weather – 9-8 – Overcast
81° / 60°
Overcast
In Waltham, cloud-filled skies are likely with a high near 81°F and a low around 60°F. There might be light rainfall having a 11% chance. Winds will be light at 9mph and gusts of 17.7mph at 7 AM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 77% at 10 PM and 40% being its lowest at 1 PM. Barometric pressure is its highest of 30.23inHg at 9 PM, a lowest point of 30.12inHg at 3 AM with an avg 30.17inHg.
Waltham, MA Weather – 9-9 – Overcast
78° / 59°

Weather Tomorrow

Overcast
Daytime highs will reach 78°F with lows dropping to 59°F in Waltham, where it will be overcast. There's a moderate 42% chance of rainfall with an estimated 0.01in. Wind will be moderate, blowing around 12mph on average and gusts of 34.2mph at 11 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 87% at 8 PM and 54% being its lowest at 4 PM. Barometric pressure is its highest of 30.24inHg at 8 AM, a lowest point of 29.92inHg at 11 PM with an avg 30.14inHg.
Waltham, MA Weather – 9-10 – Overcast
88° / 66°
Overcast
In Waltham, cloud-filled skies are likely with a high near 88°F and a low around 66°F. There's a moderate 26% chance of rainfall with an estimated 0.01in. Wind will be moderate, blowing around 15mph on average and gusts of 39.8mph at 3 AM. The humidity will be on the higher side, averaging about 69%, the maximum being 95% at 7 AM and 44% being its lowest at 3 PM. Barometric pressure is its highest of 29.87inHg at 12 AM, a lowest point of 29.66inHg at 10 PM with an avg 29.76inHg.
Waltham, MA Weather – 9-11 – Sunny
74° / 53°
Sunny
Waltham could see sunshine with daytime highs of 74°F and nighttime lows near 53°F. There might be light rainfall having a 17% chance with an estimated 0.01in. Winds will be light at 10mph and gusts of 23.8mph at 2 AM. Humidity levels should be comfortable, sitting around 51% on average, the maximum being 91% at 2 AM and 24% being its lowest at 4 PM. Barometric pressure is its highest of 30.1inHg at 11 PM, a lowest point of 29.72inHg at 12 AM with an avg 29.9inHg.
Waltham, MA Weather – 9-12 – Sunny
74° / 50°
Sunny
Waltham may see sunshine, with daytime highs of 74°F and overnight lows near 50°F. There's a very small chance of rainfall, only about 3%. Winds will be light at 10mph and gusts of 23.8mph at 11 PM. Humidity levels should be comfortable, sitting around 55% on average, the maximum being 74% at 11 PM and 34% being its lowest at 2 PM. Barometric pressure is its highest of 30.21inHg at 8 AM, a lowest point of 30.08inHg at 12 AM with an avg 30.16inHg.
Waltham, MA Weather – 9-13 – Partly Cloudy
82° / 58°
Partly Cloudy
Highs will reach 82°F with lows near 58°F in Waltham, where cloudy skies are. There's a very small chance of rainfall, only about 10%. Wind will be moderate, blowing around 11mph on average and gusts of 23.5mph at 8 AM. The humidity will be on the higher side, averaging about 71%, the maximum being 94% at 11 PM and 47% being its lowest at 2 PM. Barometric pressure is its highest of 30.18inHg at 12 AM, a lowest point of 30.04inHg at 4 PM with an avg 30.11inHg.

Currently

Overcast 62°F
30.12 inHg.
Barometer
56%
Humidity
WNW 8.3 mph
Wind
Overcast

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