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Weather data for Waltham is updated regularly with the latest available observations and forecasts.

Now · 2:22 PM

Waltham Weather & Hourly Forecast

United States · Massachusetts · 02451

62°F

Mostly sunny

Feels like: 53°F

💧 Humidity 53% 🌡 Pressure 30.53 inHg 💨 Wind 13 mph 👁 Visibility 29.9 mi ☁ Clouds 26% ☀️ UV index 4.4 · Moderate 🌅 Sunrise 6:32 AM 🌇 Sunset 6:42 PM

Hourly Forecast for Waltham

Today

3:00 PM

Mostly sunny

61° 💧 None 💨 13 mph H 53%30.50 inHg

6:00 PM

Mostly cloudy

57° 💧 None 💨 10 mph H 60%30.50 inHg

9:00 PM

Overcast night

53° 💧 0.000 in 💨 8 mph H 77%30.53 inHg

Tomorrow

12:00 AM

Mostly clear night

52° 💧 None 💨 7 mph H 82%30.50 inHg

3:00 AM

Clear night

50° 💧 None 💨 7 mph H 88%30.47 inHg

6:00 AM

Clear night

48° 💧 None 💨 8 mph H 92%30.47 inHg

9:00 AM

Sunny

55° 💧 None 💨 8 mph H 76%30.47 inHg

12:00 PM

Mostly sunny

61° 💧 None 💨 12 mph H 54%30.42 inHg

3:00 PM

Overcast

61° 💧 None 💨 11 mph H 52%30.39 inHg

6:00 PM

Mostly cloudy

57° 💧 None 💨 8 mph H 57%30.36 inHg

9:00 PM

Mostly cloudy night

52° 💧 None 💨 7 mph H 75%30.33 inHg

Friday

12:00 AM

Overcast night

51° 💧 None 💨 7 mph H 82%30.30 inHg

3:00 AM

Overcast night

50° 💧 None 💨 8 mph H 79%30.24 inHg

6:00 AM

Overcast night

51° 💧 None 💨 8 mph H 76%30.21 inHg

9:00 AM

Overcast

57° 💧 None 💨 8 mph H 71%30.21 inHg

12:00 PM

Overcast

62° 💧 None 💨 13 mph H 63%30.18 inHg

Today

3:00 PM

Mostly sunny

61° 💧 None 💨 13 mph H 53%30.50 inHg

4:00 PM

Partly cloudy

60° 💧 None 💨 13 mph H 54%30.50 inHg

5:00 PM

Mostly sunny

59° 💧 None 💨 12 mph H 55%30.50 inHg

6:00 PM

Mostly cloudy

57° 💧 None 💨 10 mph H 60%30.50 inHg

7:00 PM

Mostly cloudy night

55° 💧 None 💨 8 mph H 68%30.50 inHg

8:00 PM

Partly cloudy night

54° 💧 None 💨 8 mph H 73%30.53 inHg

9:00 PM

Overcast night

53° 💧 None 💨 8 mph H 77%30.53 inHg

10:00 PM

Mostly cloudy night

53° 💧 None 💨 8 mph H 79%30.50 inHg

11:00 PM

Partly cloudy night

52° 💧 0.000 in 💨 8 mph H 79%30.50 inHg

Tomorrow

12:00 AM

Mostly clear night

52° 💧 None 💨 7 mph H 82%30.50 inHg

1:00 AM

Mostly clear night

51° 💧 None 💨 7 mph H 83%30.50 inHg

2:00 AM

Mostly clear night

50° 💧 None 💨 7 mph H 85%30.47 inHg

3:00 AM

Clear night

50° 💧 None 💨 7 mph H 88%30.47 inHg

4:00 AM

Clear night

49° 💧 None 💨 7 mph H 91%30.47 inHg

5:00 AM

Clear night

49° 💧 None 💨 8 mph H 92%30.47 inHg

6:00 AM

Clear night

48° 💧 None 💨 8 mph H 92%30.47 inHg

7:00 AM

Sunny

48° 💧 None 💨 8 mph H 91%30.47 inHg

8:00 AM

Sunny

51° 💧 None 💨 7 mph H 86%30.47 inHg

9:00 AM

Sunny

55° 💧 None 💨 8 mph H 76%30.47 inHg

10:00 AM

Sunny

59° 💧 None 💨 11 mph H 65%30.45 inHg

11:00 AM

Sunny

60° 💧 None 💨 12 mph H 57%30.45 inHg

12:00 PM

Mostly sunny

61° 💧 None 💨 12 mph H 54%30.42 inHg

1:00 PM

Mostly cloudy

62° 💧 None 💨 11 mph H 52%30.42 inHg

2:00 PM

Overcast

62° 💧 None 💨 11 mph H 53%30.42 inHg

3:00 PM

Overcast

61° 💧 None 💨 11 mph H 52%30.39 inHg

4:00 PM

Overcast

60° 💧 None 💨 10 mph H 53%30.39 inHg

5:00 PM

Overcast

59° 💧 None 💨 10 mph H 53%30.36 inHg

6:00 PM

Mostly cloudy

57° 💧 None 💨 8 mph H 57%30.36 inHg

7:00 PM

Mostly cloudy night

54° 💧 None 💨 7 mph H 65%30.36 inHg

8:00 PM

Mostly cloudy night

53° 💧 None 💨 7 mph H 71%30.36 inHg

9:00 PM

Mostly cloudy night

52° 💧 None 💨 7 mph H 75%30.33 inHg

10:00 PM

Partly cloudy night

51° 💧 None 💨 7 mph H 78%30.33 inHg

11:00 PM

Partly cloudy night

51° 💧 None 💨 7 mph H 80%30.30 inHg

Friday

12:00 AM

Overcast night

51° 💧 None 💨 7 mph H 82%30.30 inHg

1:00 AM

Overcast night

51° 💧 None 💨 7 mph H 80%30.27 inHg

2:00 AM

Mostly cloudy night

51° 💧 None 💨 8 mph H 79%30.24 inHg

3:00 AM

Overcast night

50° 💧 None 💨 8 mph H 79%30.24 inHg

4:00 AM

Overcast night

51° 💧 None 💨 8 mph H 76%30.21 inHg

5:00 AM

Overcast night

51° 💧 None 💨 8 mph H 75%30.21 inHg

6:00 AM

Overcast night

51° 💧 None 💨 8 mph H 76%30.21 inHg

7:00 AM

Overcast

52° 💧 None 💨 8 mph H 76%30.21 inHg

8:00 AM

Overcast

54° 💧 None 💨 9 mph H 74%30.21 inHg

9:00 AM

Overcast

57° 💧 None 💨 8 mph H 71%30.21 inHg

10:00 AM

Overcast

59° 💧 None 💨 9 mph H 68%30.21 inHg

11:00 AM

Overcast

61° 💧 None 💨 12 mph H 62%30.21 inHg

12:00 PM

Overcast

62° 💧 None 💨 13 mph H 63%30.18 inHg

1:00 PM

Overcast

63° 💧 None 💨 14 mph H 58%30.15 inHg

2:00 PM

Overcast

63° 💧 None 💨 13 mph H 57%30.15 inHg

3:00 PM

Overcast

62° 💧 None 💨 13 mph H 60%30.12 inHg

4:00 PM

Overcast

62° 💧 None 💨 13 mph H 60%30.12 inHg

5:00 PM

Overcast

61° 💧 None 💨 13 mph H 59%30.12 inHg

6:00 PM

Overcast

61° 💧 None 💨 13 mph H 57%30.09 inHg

7:00 PM

Overcast night

62° 💧 None 💨 12 mph H 54%30.09 inHg

8:00 PM

Overcast night

62° 💧 0.001 in 💨 13 mph H 54%30.09 inHg

9:00 PM

Mostly cloudy night

62° 💧 0.003 in 💨 13 mph H 56%30.06 inHg

10:00 PM

Overcast night

62° 💧 None 💨 15 mph H 56%30.06 inHg

11:00 PM

Overcast night

62° 💧 None 💨 14 mph H 59%30.06 inHg

Saturday

12:00 AM

Overcast night

62° 💧 None 💨 12 mph H 62%30.03 inHg

1:00 AM

Overcast night

61° 💧 0.001 in 💨 14 mph H 67%30.00 inHg

2:00 AM

Overcast night

60° 💧 None 💨 14 mph H 71%30.00 inHg

3:00 AM

Light rain

60° 💧 0.008 in 💨 15 mph H 75%29.97 inHg

4:00 AM

Light rain

58° 💧 0.019 in 💨 15 mph H 83%29.97 inHg

5:00 AM

Light rain

57° 💧 0.050 in 💨 13 mph H 89%29.97 inHg

6:00 AM

Overcast night

57° 💧 0.002 in 💨 14 mph H 85%29.94 inHg

7:00 AM

Overcast

58° 💧 0.001 in 💨 15 mph H 80%29.94 inHg

8:00 AM

Light rain

58° 💧 0.031 in 💨 16 mph H 79%29.94 inHg

11:00 AM

Overcast

59° 💧 None 💨 14 mph H 59%29.91 inHg

2:00 PM

Moderate rain

56° 💧 None 💨 17 mph H 78%29.85 inHg

5:00 PM

Moderate rain

54° 💧 None 💨 18 mph H 94%29.80 inHg

8:00 PM

Moderate rain

53° 💧 None 💨 17 mph H 93%29.77 inHg

11:00 PM

Light rain

53° 💧 None 💨 19 mph H 96%29.74 inHg

Sunday

2:00 AM

Light rain

54° 💧 None 💨 19 mph H 97%29.71 inHg

5:00 AM

Light rain

54° 💧 None 💨 17 mph H 98%29.71 inHg

8:00 AM

Light rain

54° 💧 None 💨 16 mph H 98%29.74 inHg

11:00 AM

Light rain

55° 💧 None 💨 17 mph H 96%29.77 inHg

2:00 PM

Light rain

57° 💧 None 💨 15 mph H 93%29.77 inHg

5:00 PM

Light rain

56° 💧 None 💨 16 mph H 97%29.77 inHg

8:00 PM

Moderate rain

56° 💧 None 💨 14 mph H 98%29.80 inHg

11:00 PM

Moderate rain

55° 💧 None 💨 15 mph H 98%29.77 inHg

Monday

2:00 AM

Moderate rain

56° 💧 None 💨 15 mph H 98%29.74 inHg

5:00 AM

Heavy rain

56° 💧 None 💨 16 mph H 98%29.68 inHg

8:00 AM

Moderate rain

56° 💧 None 💨 15 mph H 99%29.65 inHg

11:00 AM

Light rain

60° 💧 None 💨 10 mph H 99%29.65 inHg

2:00 PM

Light rain

61° 💧 None 💨 7 mph H 96%29.65 inHg

5:00 PM

Light rain

61° 💧 None 💨 5 mph H 96%29.68 inHg

8:00 PM

Light rain

60° 💧 None 💨 5 mph H 99%29.71 inHg

11:00 PM

Light rain

58° 💧 None 💨 7 mph H 99%29.74 inHg

Tuesday

2:00 AM

Overcast night

58° 💧 None 💨 6 mph H 99%29.77 inHg

8:00 AM

Sunny

55° 💧 None 💨 6 mph H 89%29.85 inHg

2:00 PM

Sunny

55° 💧 None 💨 8 mph H 85%29.94 inHg

8:00 PM

Overcast night

69° 💧 None 💨 6 mph H 56%29.91 inHg

Wednesday

2:00 AM

Mostly cloudy night

59° 💧 None 💨 3 mph H 88%29.97 inHg

8:00 AM

Sunny

54° 💧 None 💨 4 mph H 94%30.03 inHg

2:00 PM

Sunny

54° 💧 None 💨 3 mph H 91%30.09 inHg

8:00 PM

Clear night

74° 💧 None 💨 6 mph H 54%30.06 inHg

Thursday

2:00 AM

Mostly clear night

63° 💧 None 💨 8 mph H 85%30.06 inHg

8:00 AM

Sunny

57° 💧 None 💨 7 mph H 95%30.09 inHg

2:00 PM

Sunny

61° 💧 None 💨 8 mph H 95%30.09 inHg

8:00 PM

Clear night

77° 💧 None 💨 11 mph H 58%30.00 inHg

Friday

2:00 AM

Mostly clear night

66° 💧 None 💨 9 mph H 85%30.00 inHg

8:00 AM

Mostly sunny

64° 💧 None 💨 9 mph H 90%29.94 inHg

2:00 PM

Overcast

68° 💧 None 💨 9 mph H 82%29.88 inHg

8:00 PM

Moderate rain

69° 💧 None 💨 14 mph H 96%29.83 inHg

Saturday

2:00 AM

Light rain

67° 💧 None 💨 9 mph H 98%29.74 inHg

8:00 AM

Sunny

63° 💧 None 💨 8 mph H 97%29.77 inHg

2:00 PM

Sunny

56° 💧 None 💨 9 mph H 85%29.88 inHg

8:00 PM

Clear night

69° 💧 None 💨 8 mph H 43%29.88 inHg

Sunday

2:00 AM

Clear night

57° 💧 None 💨 8 mph H 62%30.00 inHg

8:00 AM

Sunny

49° 💧 None 💨 6 mph H 71%30.12 inHg

2:00 PM

Sunny

49° 💧 None 💨 5 mph H 78%30.24 inHg

8:00 PM

Mostly clear night

61° 💧 None 💨 3 mph H 48%30.21 inHg

Monday

2:00 AM

Clear night

53° 💧 None 💨 6 mph H 67%30.21 inHg

8:00 AM

Sunny

46° 💧 None 💨 4 mph H 81%30.21 inHg

2:00 PM

Sunny

48° 💧 None 💨 5 mph H 79%30.21 inHg

8:00 PM

Overcast night

64° 💧 None 💨 5 mph H 44%30.18 inHg

Tuesday

2:00 AM

Clear night

55° 💧 None 💨 6 mph H 68%30.15 inHg

8:00 AM

Mostly cloudy

49° 💧 None 💨 4 mph H 86%30.15 inHg

2:00 PM

Sunny

51° 💧 None 💨 6 mph H 85%30.09 inHg

8:00 PM

Partly cloudy night

69° 💧 None 💨 11 mph H 50%29.97 inHg

Wednesday

2:00 AM

Clear night

60° 💧 None 💨 11 mph H 78%29.88 inHg

8:00 AM

Sunny

59° 💧 None 💨 12 mph H 86%29.74 inHg

2:00 PM

Mostly cloudy

60° 💧 None 💨 9 mph H 84%29.68 inHg

8:00 PM

Mostly clear night

70° 💧 None 💨 8 mph H 55%29.59 inHg

Thursday

2:00 AM

Mostly clear night

58° 💧 None 💨 8 mph H 54%29.62 inHg

In Waltham and, more broadly, across the state of Massachusetts: This morning will start with mostly cloudy skies and mild temperatures ranging from 52 to 66 degrees Fahrenheit. Winds will be coming from the north at around 10 mph, with occasional gusts reaching up to 23 mph. As the day progresses into the afternoon, the cloud cover is expected to remain, but no precipitation is forecasted. Temperatures will stay mild, providing comfortable conditions for outdoor activities. Winds will continue at moderate speeds, with gusts still reaching around 23 mph. Overall, it looks like a relatively calm and cloudy day with no significant weather disturbances expected.

15-Day Weather Outlook for Waltham

TomorrowTomorrow

Mostly sunny 62°/48° 💧 None 💨 12 mph

Friday, Sep 25Fri Sep 25

Overcast 63°/50° 💧 None 💨 15 mph

Saturday, Sep 26Sat Sep 26

Moderate rain 62°/53° 💧 1.048 in 💨 19 mph

Sunday, Sep 27Sun Sep 27

Moderate rain 57°/54° 💧 0.827 in 💨 19 mph

Monday, Sep 28Mon Sep 28

Heavy rain 61°/56° 💧 1.504 in 💨 16 mph

Tuesday, Sep 29Tue Sep 29

Overcast 69°/55° 💧 0.014 in 💨 8 mph

Wednesday, Sep 30Wed Sep 30

Mostly cloudy 74°/54° 💧 None 💨 6 mph

Thursday, Oct 1Thu Oct 1

Mostly sunny 77°/57° 💧 None 💨 11 mph

Friday, Oct 2Fri Oct 2

Moderate rain 69°/64° 💧 0.254 in 💨 14 mph

Saturday, Oct 3Sat Oct 3

Light rain 69°/56° 💧 0.559 in 💨 9 mph

Sunday, Oct 4Sun Oct 4

Mostly sunny 61°/49° 💧 None 💨 8 mph

Monday, Oct 5Mon Oct 5

Overcast 64°/46° 💧 None 💨 6 mph

Tuesday, Oct 6Tue Oct 6

Mostly cloudy 69°/49° 💧 None 💨 11 mph

Wednesday, Oct 7Wed Oct 7

Mostly cloudy 70°/59° 💧 0.058 in 💨 12 mph

Thursday, Oct 8Thu Oct 8

Mostly sunny 58°/58° 💧 None 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Waltham

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Waltham

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 3:00 PM

PM2.5 Fine particles Good 1,2µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 4,6µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Fair 70,4µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,9µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Waltham

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 5,0Moderate 🙂Fair

Tomorrow UV 5,0Moderate 🙂Fair

Friday UV 2,7Low 🙂Fair

Saturday UV 0,3Low 🙂Fair

Sunday UV 3,0Moderate 🙂Fair

Monday UV 4,0Moderate —Unavailable

Tuesday UV 4,0Moderate —Unavailable

Hourly UV index today

3:00 PMUV 3,1 4:00 PMUV 1,8 5:00 PMUV 0,7 6:00 PMUV 0,2 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Waltham

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · WALTHAM, MASSACHUSETTS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

93/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:15 PM–5:00 AM

☁ Cloud cover 5% Real hourly forecast for the best viewing hour.

☾ Moonlight 94% Waxing Gibbous · Moon below the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 60° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min69%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

ACTIVE NOW

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Waltham were last refreshed today at 2:22 PM. The current forecast period extends through 25/09/2026 at 12:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.