Current Conditions

Waltham, Massachusetts

66°F19°C

Cloudy

Wind

SE 6 mph10 km/h

Humidity

79%

Cloud Cover

93%

As of Wednesday, September 2, 2026 at 7:59 PM EDT

Today's Outlook

Night

Overcast, with a low around 64°F18°C. Light wind from the SE around 6 mph10 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Cloudy	High 72°F22°C	Low 64°F18°C	Precip 0 in0 mm—	Cloud 94%	Wind SE 6 mph10 km/h	Wednesday: Overcast and warm, with a high of 72°F22°C. Breezy from the ESE at 7 mph11 km/h. Wednesday Night: Overcast, with a low around 64°F18°C. Light wind from the SE around 6 mph10 km/h.
Rain	High 77°F25°C	Low 64°F18°C	Precip 0.43 in10.8 mm98%	Cloud 87%	Wind S 5 mph8 km/h	Thursday: Overcast and warm, with a high of 77°F25°C and morning low of 66°F19°C. Light wind from the SSW around 5 mph7 km/h. 98% chance of rain throughout the day. Humid. Thursday Night: Overcast, with a low around 64°F18°C. Breezy from the SSE at 5 to 7 mph8 to 11 km/h. 89% chance of light rain throughout the night.
Drizzle	High 81°F27°C	Low 67°F19°C	Precip 0.03 in0.8 mm16%	Cloud 57%	Wind NW 5 mph8 km/h	Friday: Mostly cloudy and warm, with a high of 81°F27°C and morning low of 69°F20°C. Light wind from the NW around 5 mph7 km/h. 16% chance of drizzle throughout the day. Humid. Friday Night: Mostly cloudy, with a low around 67°F19°C. Breezy from the NW at 5 to 7 mph8 to 12 km/h.
Showers	High 73°F23°C	Low 63°F17°C	Precip 0.1 in2.5 mm70%	Cloud 43%	Wind N 8 mph12 km/h	Saturday: Mostly cloudy and warm, with a high of 73°F23°C and morning low of 67°F20°C. Breezy from the NNE at 8 to 9 mph13 to 14 km/h. 70% chance of showers throughout the day. Saturday Night: Partly cloudy, with a low around 63°F17°C. Breezy from the NNW at 7 to 8 mph12 to 13 km/h. 49% chance of drizzle in the evening.
Drizzle	High 72°F22°C	Low 60°F15°C	Precip 0.02 in0.4 mm10%	Cloud 36%	Wind N 8 mph12 km/h	Sunday: Partly cloudy and warm, with a high of 72°F22°C and morning low of 61°F16°C. Breezy from the N at 9 to 10 mph14 to 16 km/h. 10% chance of drizzle. Sunday Night: Partly cloudy, with a low around 60°F15°C. Breezy from the NNW at 7 to 8 mph10 to 13 km/h.
Clear	High 78°F26°C	Low 56°F13°C	Precip 0 in0 mm—	Cloud 19%	Wind NW 6 mph9 km/h	Monday: Mostly clear and warm, with a high of 78°F26°C and morning low of 60°F16°C. Light wind from the NNW around 5 mph9 km/h. Monday Night: Partly cloudy, with a low around 56°F13°C. Breezy from the WNW at 6 to 7 mph10 to 11 km/h.
Partly Cloudy	High 79°F26°C	Low 60°F16°C	Precip 0 in0.1 mm4%	Cloud 46%	Wind WNW 6 mph9 km/h	Tuesday: Partly cloudy and warm, with a high of 79°F26°C and morning low of 64°F18°C. Light wind from the NW around 5 mph8 km/h. Tuesday Night: Partly cloudy, with a low around 60°F16°C. Light wind from the W around 6 mph10 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 2	72°F22°C	64°F18°C	0 in0 mm· —	94%	Cloudy	SE 6 mph10 km/h
DayOvercast and warm, with a high of 72°F22°C. Breezy from the ESE at 7 mph11 km/h. NightOvercast, with a low around 64°F18°C. Light wind from the SE around 6 mph10 km/h.
	ThursdaySep 3	77°F25°C	64°F18°C	0.43 in10.8 mm· 98%	87%	Rain	S 5 mph8 km/h
DayOvercast and warm, with a high of 77°F25°C and morning low of 66°F19°C. Light wind from the SSW around 5 mph7 km/h. 98% chance of rain throughout the day. Humid. NightOvercast, with a low around 64°F18°C. Breezy from the SSE at 5 to 7 mph8 to 11 km/h. 89% chance of light rain throughout the night.
	FridaySep 4	81°F27°C	67°F19°C	0.03 in0.8 mm· 16%	57%	Drizzle	NW 5 mph8 km/h
DayMostly cloudy and warm, with a high of 81°F27°C and morning low of 69°F20°C. Light wind from the NW around 5 mph7 km/h. 16% chance of drizzle throughout the day. Humid. NightMostly cloudy, with a low around 67°F19°C. Breezy from the NW at 5 to 7 mph8 to 12 km/h.
	SaturdaySep 5	73°F23°C	63°F17°C	0.1 in2.5 mm· 70%	43%	Showers	N 8 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 67°F20°C. Breezy from the NNE at 8 to 9 mph13 to 14 km/h. 70% chance of showers throughout the day. NightPartly cloudy, with a low around 63°F17°C. Breezy from the NNW at 7 to 8 mph12 to 13 km/h. 49% chance of drizzle in the evening.
	SundaySep 6	72°F22°C	60°F15°C	0.02 in0.4 mm· 10%	36%	Drizzle	N 8 mph12 km/h
DayPartly cloudy and warm, with a high of 72°F22°C and morning low of 61°F16°C. Breezy from the N at 9 to 10 mph14 to 16 km/h. 10% chance of drizzle. NightPartly cloudy, with a low around 60°F15°C. Breezy from the NNW at 7 to 8 mph10 to 13 km/h.
	MondaySep 7	78°F26°C	56°F13°C	0 in0 mm· —	19%	Clear	NW 6 mph9 km/h
DayMostly clear and warm, with a high of 78°F26°C and morning low of 60°F16°C. Light wind from the NNW around 5 mph9 km/h. NightPartly cloudy, with a low around 56°F13°C. Breezy from the WNW at 6 to 7 mph10 to 11 km/h.
	TuesdaySep 8	79°F26°C	60°F16°C	0 in0.1 mm· 4%	46%	Partly Cloudy	WNW 6 mph9 km/h
DayPartly cloudy and warm, with a high of 79°F26°C and morning low of 64°F18°C. Light wind from the NW around 5 mph8 km/h. NightPartly cloudy, with a low around 60°F16°C. Light wind from the W around 6 mph10 km/h.
	WednesdaySep 9	80°F27°C	62°F17°C	0.02 in0.6 mm· 9%	67%	Partly Cloudy	SW 8 mph13 km/h
DayMostly cloudy and warm, with a high of 80°F27°C and morning low of 65°F18°C. Breezy from the SSW at 8 to 10 mph12 to 16 km/h. NightMostly cloudy, with a low around 62°F17°C. Breezy from the SW at 8 to 11 mph13 to 17 km/h.
	ThursdaySep 10	85°F30°C	72°F22°C	0.09 in2.3 mm· 19%	61%	Drizzle	WSW 10 mph16 km/h
DayMostly cloudy and warm, with a high of 85°F30°C and morning low of 74°F23°C. Breezy from the WSW at 10 to 11 mph16 to 17 km/h. 17% chance of drizzle throughout the day. Humid. NightMostly cloudy, with a low around 72°F22°C. Breezy from the WSW at 10 to 11 mph16 to 17 km/h. 19% chance of drizzle throughout the night.
	FridaySep 11	77°F25°C	65°F18°C	0.08 in2.1 mm· 18%	44%	Showers	WNW 8 mph12 km/h
DayPartly cloudy and warm, with a high of 77°F25°C and morning low of 67°F19°C. Breezy from the NW at 8 mph12 km/h. 15% chance of drizzle throughout the day. NightPartly cloudy, with a low around 65°F18°C. Breezy from the WNW at 7 to 8 mph12 to 14 km/h. 18% chance of showers throughout the night.
	SaturdaySep 12	75°F24°C	60°F16°C	0.08 in2 mm· 11%	49%	Drizzle	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 63°F17°C. Breezy from the WSW at 7 mph10 km/h. 11% chance of drizzle throughout the day. NightPartly cloudy, with a low around 60°F16°C. Breezy from the SW at 7 mph11 km/h. 11% chance of drizzle throughout the night.
	SundaySep 13	78°F25°C	62°F16°C	0.09 in2.2 mm· 15%	53%	Drizzle	SW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 78°F25°C and morning low of 64°F18°C. Breezy from the SW at 7 to 8 mph12 to 13 km/h. 15% chance of drizzle throughout the day. NightMostly cloudy, with a low around 62°F16°C. Breezy from the SW at 7 mph11 km/h. 11% chance of drizzle throughout the night.
	MondaySep 14	78°F26°C	64°F18°C	0.09 in2.2 mm· 18%	51%	Drizzle	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 78°F26°C and morning low of 66°F19°C. Breezy from the WSW at 7 to 8 mph11 to 12 km/h. 16% chance of drizzle throughout the day. NightMostly cloudy, with a low around 64°F18°C. Breezy from the WSW at 7 mph11 km/h. 18% chance of drizzle throughout the night.
	TuesdaySep 15	77°F25°C	63°F17°C	0.08 in2.1 mm· 14%	52%	Drizzle	W 7 mph11 km/h
DayMostly cloudy and warm, with a high of 77°F25°C and morning low of 65°F18°C. Breezy from the W at 7 to 8 mph12 to 12 km/h. 14% chance of drizzle throughout the day. NightPartly cloudy, with a low around 63°F17°C. Breezy from the WSW at 7 mph11 km/h. 11% chance of drizzle throughout the night.
	WednesdaySep 16	77°F25°C	62°F16°C	0.1 in2.5 mm· 13%	47%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 77°F25°C and morning low of 64°F18°C. Breezy from the W at 6 to 7 mph10 to 11 km/h. 13% chance of showers throughout the day. NightPartly cloudy, with a low around 62°F16°C. Light wind from the WSW around 7 mph11 km/h. 10% chance of drizzle throughout the night.

Nearby Cities

Watertown3 mi4 km Newton3 mi5 km Belmont3 mi5 km Brighton4 mi7 km Chestnut Hill5 mi8 km Arlington5 mi8 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 42.3765°N, 71.2356°W·Elevation: 20m·Timezone: America/New_York·Population: 63,378