Water Temperature of Stony Brook in Waltham, MA

Current Water Temperature

46.2°F 7.9°C
Frigid Dangerously Cold
46.2°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Saturday, November 14, 2026, 2:50 AM EST

Temperature Locations

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Local Points of Interest

Cambridge Reservoir (Hobbs Brook Basin)

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Stony Brook

Station Name: HOBBS BK BELOW CAMBRIDGE RES NR KENDALL GREEN, MA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 167 feet

Nearest Address:
Winter St
Waltham, MA 02451
Middlesex County

GPS Coordinates: 42.3981512, -71.2733903

Nearby Water Temperatures

Stony Brook, Weston, MA (1.2 mi)
Cambridge Reservoir, Lincoln, MA (1.6 mi)
Cambridge Reservoir Tributary 3, Waltham, MA (1.7 mi)
Stony Brook Tributary, Waltham, MA (1.8 mi)
Stony Brook Tributary, Weston, MA (1.9 mi)
Stony Brook, Weston, MA (2 mi)
Hobbs Brook, Lincoln, MA (2.7 mi)
Cambridge Reservoir Tributary 1, Lexington, MA (2.7 mi)
Cambridge Reservoir Tributary 2, Lexington, MA (2.7 mi)
Stony Brook Reservoir Tributary, Weston, MA (3 mi)
Shawsheen River, Bedford, MA (4.8 mi)
Fresh Pond, Cambridge, MA (6.6 mi)
Nashua River, Clinton, MA (20.1 mi)
Gates Brook, West Boylston, MA (25.7 mi)
Stillwater River, Sterling, MA (26.4 mi)

Weather for Waltham, Massachusetts

Current Weather

34.9°F
Sunny
Conditions: Sunny
Humidity: 80%
Feels Like: 28.2°F
Wind: NW 6 mph
Wind Gusts: 17.5 mph
Pressure: 29.7 in
Precipitation: 0 in
Cloud Cover: 3%
Visibility: 11.8 mi
UV Index: 0.8

Five-Day Weather Forecast

Overcast
Sat
H: 42°F
L: 32°F
Overcast
Sun
H: 45°F
L: 33°F
Overcast
Mon
H: 49°F
L: 36°F
Mainly Sunny
Tue
H: 54°F
L: 35°F
Overcast
Wed
H: 58°F
L: 41°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
12.6 μg/m³
Moderate
PM10
12.6 μg/m³
Good
Ozone (O3)
23 μg/m³
Photochemical
NO2
26.2 μg/m³
Nitrogen Dioxide
SO2
1.6 μg/m³
Sulfur Dioxide
CO
182 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 49m daylight
Sunrise 6:35 AM
Solar Noon 11:29 AM
Sunset 4:24 PM
Moon
Waxing Crescent • 21%
Moonrise 11:24 AM
Transit 3:54 PM
Moonset 8:29 PM

Best Times for Fishing or Hunting

Major Periods

2:59 AM - 5:29 AM
3:24 PM - 5:54 PM

Minor Periods

10:54 AM - 12:24 PM
7:59 PM - 9:29 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 36.5°F
Average Humidity: 78%
Chance of Rain: 3%
Wind: 8.6 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
6.4 μg/m³
Good
PM10
6.4 μg/m³
Good
Ozone (O3)
31.6 μg/m³
Photochemical
NO2
20.8 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
155.4 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 49m daylight
Sunrise 6:35 AM
Solar Noon 11:29 AM
Sunset 4:24 PM
Moon
Waxing Crescent • 21%
Moonrise 11:24 AM
Transit 3:54 PM
Moonset 8:29 PM

Best Times for Fishing or Hunting

Major Periods

2:59 AM - 5:29 AM
3:24 PM - 5:54 PM

Minor Periods

10:54 AM - 12:24 PM
7:59 PM - 9:29 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 37.9°F
Average Humidity: 77%
Chance of Rain: 2%
Wind: 11.5 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
2.6 μg/m³
Good
PM10
2.6 μg/m³
Good
Ozone (O3)
43 μg/m³
Photochemical
NO2
14.2 μg/m³
Nitrogen Dioxide
SO2
1.2 μg/m³
Sulfur Dioxide
CO
138.5 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 47m daylight
Sunrise 6:36 AM
Solar Noon 11:29 AM
Sunset 4:23 PM
Moon
Waxing Crescent • 31%
Moonrise 11:55 AM
Transit 4:40 PM
Moonset 9:33 PM

Best Times for Fishing or Hunting

Major Periods

3:47 AM - 6:17 AM
4:10 PM - 6:40 PM

Minor Periods

11:25 AM - 12:55 PM
9:03 PM - 10:33 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 41°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 7.5 mph
UV Index: 2.9

Air Quality

EPA Index 1 • Good
PM2.5
5.6 μg/m³
Good
PM10
5.7 μg/m³
Good
Ozone (O3)
39.7 μg/m³
Photochemical
NO2
24.7 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
154.2 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 45m daylight
Sunrise 6:38 AM
Solar Noon 11:29 AM
Sunset 4:22 PM
Moon
First Quarter • 42%
Moonrise 12:21 PM
Transit 5:25 PM
Moonset 10:38 PM

Best Times for Fishing or Hunting

Major Periods

4:33 AM - 7:03 AM
4:55 PM - 7:25 PM

Minor Periods

11:51 AM - 1:21 PM
10:08 PM - 11:38 PM
Action Rating:
Good Action 3/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Mainly Sunny
Average Temperature: 43.3°F
Average Humidity: 58%
Chance of Rain: 0%
Wind: 6.3 mph
UV Index: 2.9

Air Quality

EPA Index 1 • Good
PM2.5
9 μg/m³
Good
PM10
9.2 μg/m³
Good
Ozone (O3)
30.5 μg/m³
Photochemical
NO2
32.5 μg/m³
Nitrogen Dioxide
SO2
1.5 μg/m³
Sulfur Dioxide
CO
195.9 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 43m daylight
Sunrise 6:39 AM
Solar Noon 11:30 AM
Sunset 4:21 PM
Moon
First Quarter • 54%
Moonrise 12:44 PM
Transit 6:08 PM
Moonset 11:42 PM

Best Times for Fishing or Hunting

Major Periods

5:16 AM - 7:46 AM
5:38 PM - 8:08 PM

Minor Periods

12:14 PM - 1:44 PM
11:12 PM - 12:42 AM
Action Rating:
Fair Action 2/5
Wednesday, November 18, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 47.8°F
Average Humidity: 55%
Chance of Rain: 0%
Wind: 8.5 mph
UV Index: 2.8

Air Quality

EPA Index 2 • Moderate
PM2.5
12.4 μg/m³
Moderate
PM10
12.5 μg/m³
Good
Ozone (O3)
30.8 μg/m³
Photochemical
NO2
27.6 μg/m³
Nitrogen Dioxide
SO2
2.4 μg/m³
Sulfur Dioxide
CO
265.7 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 41m daylight
Sunrise 6:40 AM
Solar Noon 11:30 AM
Sunset 4:21 PM
Moon
First Quarter • 65%
Moonrise 1:04 PM
Transit 6:50 PM
Moonset 1:30 AM

Best Times for Fishing or Hunting

Major Periods

5:59 AM - 8:29 AM
6:20 PM - 8:50 PM

Minor Periods

1:00 AM - 2:30 AM
12:34 PM - 2:04 PM
Action Rating:
Fair Action 2/5
The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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