Observed 7:35 AM EDT at KBED

Waltham, MA weather

Sunny and 27°−3°.

Forecasts agree

Now 27°−3°

Sunny

Wind: Calm; Light through 8 PM
Dew point: 25°−4°; Dry · up to 33°1° by 8 PM
Humidity: 93%; Air 27°−3°, dew point 25°−4° · frost likely
UV index: 0Low; Moderate 1–2 PM · peak 3
Air quality: 42Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.52 inHg1034 hPa; Rising slowly · +0.02 inHg+0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 50°10° today by 11 AM
High 62°17° today at 3 PM
Below 50°10° tonight after 8 PM
Low 33°1° tomorrow at 6 AM

This morningUp to 52°11° by 11 AM · Clear
This afternoonUp to 62°17° by 3 PM · Clear
TonightDown to 34°1° by 5 AM · Clear
Tomorrow morningUp to 56°13° by 11 AM · Clear
Tomorrow afternoonUp to 67°19° by 2 PM · Clear
Tomorrow nightDown to 40°4° by 2 AM · Clear

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 8a	Sunny	34°1° (likely 32°0° to 35°2°)	34°1°	0%	1 mph2 km/h from NW, gusts 6 mph9 km/h	78%	12%	0
Sat 9a	Sunny	39°4° (likely 37°3° to 40°4°)	39°4°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	70%	4%	0
Sat 10a	Sunny	46°8° (likely 42°6° to 46°8°)	46°8°	0%	1 mph2 km/h from NW, gusts 7 mph12 km/h	58%	3%	1
Sat 11a	Sunny	52°11° (likely 48°9° to 52°11°)	52°11°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	46%	3%	2
Sat 12p	Sunny	56°13° (likely 52°11° to 56°13°)	56°13°	0%	2 mph3 km/h from NW, gusts 10 mph15 km/h	38%	5%	2
Sat 1p	Sunny	59°15° (likely 55°13° to 59°15°)	59°15°	0%	2 mph3 km/h from NW, gusts 8 mph13 km/h	34%	6%	3
Sat 2p	Sunny	61°16° (likely 58°14° to 61°16°)	61°16°	0%	2 mph3 km/h from NW, gusts 9 mph14 km/h	29%	6%	2
Sat 3p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	2 mph3 km/h from NW, gusts 7 mph11 km/h	28%	6%	2
Sat 4p	Sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	2 mph3 km/h from NW, gusts 6 mph9 km/h	28%	2%	1
Sat 5p	Sunny	60°16° (likely 56°13° to 60°16°)	60°16°	0%	2 mph3 km/h from NW, gusts 4 mph7 km/h	31%	0%	0
Sat 6p	Clear	56°13° (likely 50°10° to 56°13°)	56°13°	0%	2 mph3 km/h from NW, gusts 3 mph6 km/h	38%	0%	0
Sat 7p	Clear	51°11° (likely 46°8° to 51°11°)	51°11°	0%	2 mph3 km/h from SW, gusts 5 mph8 km/h	48%	0%	0
Sat 8p	Clear	46°8° (likely 44°7° to 48°9°)	46°8°	0%	2 mph3 km/h from S, gusts 4 mph7 km/h	60%	0%	0
Sat 9p	Clear	43°6° (likely 43°6° to 46°8°)	43°6°	0%	2 mph3 km/h from SW, gusts 3 mph5 km/h	67%	0%	0
Sat 10p	Clear	42°6° (likely 41°5° to 45°7°)	42°6°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	70%	0%	0
Sat 11p	Clear	40°4° (likely 40°4° to 44°7°)	40°4°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	76%	0%	0
Sun 12a	Clear	39°4° (likely 39°4° to 40°4°)	39°4°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	79%	0%	0
Sun 1a	Clear	38°3° (likely 37°3° to 38°3°)	38°3°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	79%	0%	0
Sun 2a	Clear	37°3° (likely 37°3° to 37°3°)	37°3°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	82%	0%	0
Sun 3a	Clear	36°2° (likely 36°2° to 37°3°)	36°2°	0%	2 mph3 km/h from W, gusts 5 mph9 km/h	79%	0%	0
Sun 4a	Clear	35°2° (likely 35°2° to 37°3°)	35°2°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	78%	0%	0
Sun 5a	Clear	34°1° (likely 34°1° to 37°3°)	34°1°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	89%	6%	0
Sun 6a	Clear	33°1° (likely 33°1° to 36°2°)	33°1°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	89%	11%	0
Sun 7a	Sunny	33°1° (likely 32°0° to 36°2°)	33°1°	0%	2 mph3 km/h from W, gusts 6 mph9 km/h	89%	12%	0
Sun 8a	Sunny	36°2° (likely 34°1° to 37°3°)	36°2°	0%	2 mph3 km/h from W, gusts 5 mph8 km/h	85%	11%	0
Sun 9a	Sunny	41°5° (likely 40°4° to 43°6°)	41°5°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	70%	0%	1
Sun 10a	Sunny	49°9° (likely 49°9° to 51°11°)	49°9°	0%	2 mph3 km/h from W, gusts 5 mph7 km/h	52%	0%	2
Sun 11a	Sunny	56°13° (likely 55°13° to 58°14°)	56°13°	0%	2 mph3 km/h from W, gusts 6 mph10 km/h	40%	0%	3
Sun 12p	Sunny	61°16° (likely 60°16° to 62°17°)	61°16°	0%	3 mph5 km/h from W, gusts 8 mph12 km/h	32%	0%	4
Sun 1p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	5 mph8 km/h from SW, gusts 8 mph13 km/h	28%	0%	4
Sun 2p	Sunny	67°19° (likely 65°18° to 67°19°)	67°19°	0%	6 mph10 km/h from SW, gusts 8 mph13 km/h	25%	0%	4
Sun 3p	Sunny	67°19° (likely 65°18° to 67°19°)	67°19°	0%	6 mph10 km/h from SW, gusts 9 mph14 km/h	25%	0%	3
Sun 4p	Sunny	67°19° (likely 63°17° to 67°19°)	67°19°	0%	6 mph10 km/h from S, gusts 8 mph13 km/h	26%	0%	2
Sun 5p	Sunny	64°18° (likely 60°16° to 64°18°)	64°18°	0%	6 mph10 km/h from S, gusts 8 mph13 km/h	29%	0%	1
Sun 6p	Clear	60°16° (likely 55°13° to 60°16°)	60°16°	0%	6 mph10 km/h from S, gusts 7 mph11 km/h	36%	0%	0
Sun 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	5 mph8 km/h from S, gusts 8 mph13 km/h	47%	0%	0
Sun 8p	Clear	50°10° (likely 48°9° to 52°11°)	49°9°	0%	3 mph5 km/h from SW, gusts 9 mph15 km/h	61%	0%	0
Sun 9p	Clear	47°8° (likely 46°8° to 47°8°)	45°7°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	68%	0%	0
Sun 10p	Clear	46°8° (likely 44°7° to 46°8°)	44°7°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	71%	0%	0
Sun 11p	Clear	44°7° (likely 43°6° to 45°7°)	41°5°	0%	5 mph8 km/h from SW, gusts 10 mph16 km/h	76%	0%	0
Mon 12a	Clear	42°6° (likely 42°6° to 45°7°)	39°4°	0%	5 mph8 km/h from SW, gusts 9 mph15 km/h	82%	0%	0
Mon 1a	Clear	41°5° (likely 41°5° to 45°7°)	38°3°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	82%	0%	0
Mon 2a	Clear	40°4° (likely 40°4° to 45°7°)	37°3°	0%	5 mph8 km/h from SW, gusts 9 mph14 km/h	85%	1%	0
Mon 3a	Clear	41°5° (likely 39°4° to 48°9°)	38°3°	0%	5 mph8 km/h from SW, gusts 7 mph11 km/h	79%	0%	0
Mon 4a	Clear	42°6° (likely 38°3° to 47°8°)	40°4°	0%	3 mph5 km/h from SW, gusts 6 mph9 km/h	79%	0%	0
Mon 5a	Clear	42°6° (likely 38°3° to 47°8°)	40°4°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	79%	2%	0
Mon 6a	Clear	39°4° (likely 37°3° to 46°8°)	37°3°	0%	3 mph5 km/h from W, gusts 7 mph11 km/h	89%	9%	0
Mon 7a	Sunny	37°3° (likely 37°3° to 46°8°)	34°1°	0%	3 mph5 km/h from W, gusts 8 mph13 km/h	100%	17%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Mostly sunny. High 62°17°, low 32°0°. Typical 59°15° / 45°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 34°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 46°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Official NWS forecast
Today: Areas of frost before 9am. Sunny, with a high near 62. Northwest wind around 2 mph.
Tonight: Areas of frost after 3am. Clear, with a low around 32. West wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
59°15°–62°17°
Low, likely
30°−1°–34°1°
Typical high / low
59°15° / 45°7°
Wind
5 mph8 km/h, gusts 13 mph21 km/h
UV peak
4
Tomorrow, Oct 25. Sunny. High 68°20°, low 34°1°. Typical 59°15° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Day: Areas of frost before 9am. Sunny, with a high near 68. Southwest wind 2 to 6 mph.
Night: Clear, with a low around 34. Southwest wind around 6 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–68°20°
Low, likely
32°0°–36°2°
Typical high / low
59°15° / 44°7°
Wind
7 mph11 km/h, gusts 13 mph21 km/h
UV peak
4
Monday, Oct 26. Sunny. High 69°21°, low 41°5°. Typical 59°15° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°5°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 69. West wind 3 to 9 mph.
Night: Mostly clear, with a low around 41. Northwest wind around 7 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–70°21°
Low, likely
37°3°–43°6°
Typical high / low
59°15° / 44°7°
Wind
9 mph14 km/h, gusts 18 mph29 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 54°12°, low 31°−1°. Typical 58°14° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 42°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 53°12°
  Dry
3. Evening
  6 PM–midnight
  Clear, 42°5°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 34°1°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 54. North wind 3 to 7 mph.
Night: Mostly clear, with a low around 31. North wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
52°11°–55°13°
Low, likely
31°−1°–42°6°
Typical high / low
58°14° / 44°7°
Wind
10 mph16 km/h, gusts 24 mph39 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 54°12°, low 36°2°. Typical 58°14° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 33°1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 54°12°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 44°7°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 54. Northeast wind around 3 mph.
Night: Mostly clear, with a low around 36. South wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
51°11°–55°13°
Low, likely
28°−2°–37°3°
Typical high / low
58°14° / 44°7°
Wind
6 mph10 km/h, gusts 13 mph20 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 62°17°, low 48°9°. Typical 58°14° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 62. Southwest wind 3 to 9 mph.
Night: Mostly clear, with a low around 48. Southwest wind around 8 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–66°19°
Low, likely
38°3°–48°9°
Typical high / low
58°14° / 43°6°
Wind
11 mph18 km/h, gusts 33 mph53 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 66°19°, low 43°6°. Typical 57°14° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66. West wind around 8 mph.
Night: Mostly clear, with a low around 43. Northwest wind around 6 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
66°19°–71°22°
Low, likely
43°6°–50°10°
Typical high / low
57°14° / 43°6°
Wind
9 mph14 km/h, gusts 26 mph41 km/h
UV peak
3
Saturday, Oct 31. Drizzle. High 63°17°, low 45°7°. Typical 57°14° / 43°6°. Rain, 0% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–73°23°
Low, likely
43°6°–47°8°
Typical high / low
57°14° / 43°6°
Wind
12 mph19 km/h, gusts 24 mph38 km/h
UV peak
3
Sunday, Nov 1. Cloudy. High 65°18°, low 45°7°. Typical 57°14° / 42°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 55°13°
  20% chance
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  30% chance
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–71°22°
Low, likely
39°4°–49°9°
Typical high / low
57°14° / 42°6°
Wind
9 mph14 km/h, gusts 21 mph33 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 61°16°, low 50°10°. Typical 56°13° / 42°6°. Rain 0.05 in1.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  20% chance · 0.01 in0.3 mm
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  20% chance · 0.05 in1.4 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
51°11°–67°19°
Low, likely
43°6°–55°13°
Typical high / low
56°13° / 42°6°
Wind
9 mph15 km/h, gusts 16 mph26 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 62°, low 32°.
Tomorrow
Dry, high 68°, low 34°, warming up.
Monday
Dry, high 69°, low 41°.
Rest of week
Mostly dry, highs 54–66°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (BOX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Sudbury River at Saxonville

9.1 mi

Below flood stage

Level: 5.2 ft
Flow: 92 cfs

Forecast peak 4.5 ft Sat 8 AM

Reading from Sat 6:15 AM · NWS gauge page

Charles River at Dover

9.2 mi

Below flood stage

Level: 1.0 ft
Flow: 106 cfs

Forecast peak 1.0 ft Sat 8 AM

Reading from Sat 5:45 AM · NWS gauge page

Boston Harbor at Boston (IN MLLW)

10 mi

Below flood stage

Level: 5.0 ft

Forecast peak 10.9 ft Mon 12 PM

Reading from Sat 6:36 AM · NWS gauge page

Assabet River at Maynard

11 mi

Below flood stage

Level: 2.2 ft
Flow: 110 cfs

Forecast peak 2.2 ft Sat 8 AM

Reading from Sat 6:15 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 66% less heating than a typical week.

This week 33Typical 98

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 27
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 10 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 25°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.

Open the windows?

Today, 2:00 PM–5:00 PM

Good stretch to open the windows.

Is this typical?

Boston Area · official normals 1991–2020 · records 1872–2026

Oct 24, today vs a typical year

Today’s expected high is 3°2° warmer than typical.

Last 7 days vs normal

On average 3°2° colder than normal (daily mean temperature).

−9°−5°SunOct 18
−5°−3°MonOct 19
±0°TueOct 20
−2°−1°WedOct 21
+3°+2°ThuOct 22
−4°−2°FriOct 23
—SatOct 24

Waltham weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 40 min; Losing 2 min 44 s a day; shortest Dec 21, 1 h 36 min less
Golden hour: 5:09–6:06 PM; Morning 6:50–7:47 AM
Blue hour: 6:06–6:17 PM; Morning 6:39–6:50 AM; first light 6:39 AM

Stars tonight? Fair

Clear 6:17 PM–6:41 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:17 AM · rises 4:46 PM
Full moon: Oct 26
New moon: Nov 9

Looking east from Waltham. The highest point on the skyline is about 700 ft, 14 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Waltham, MA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Sudbury River at Saxonville

Charles River at Dover

Boston Harbor at Boston (IN MLLW)

Assabet River at Maynard

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon