Water Temperature of Stony Brook in Waltham, MA

Current Water Temperature

76.6°F

Measurement Time: Saturday, July 18, 2026, 2:00 AM EDT

Temperature Locations

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Local Points of Interest

Cambridge Reservoir (Hobbs Brook Basin)

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

60.4°F
Sunny
Sunny
51.4°F
60.4°F
72%
WSW 3.1 mph
6.6 mph
60.4°F
51.4°F
0 in
0%
6 mi
1016 mbar
0

Five Day Weather Forecast

Smoky haze
Sat
H: 94°F
L: 60°F
Sunny
Sun
H: 82°F
L: 63°F
Sunny
Mon
H: 85°F
L: 57°F
Sunny
Tue
H: 84°F
L: 59°F
Sunny
Wed
H: 88°F
L: 69°F

Air Quality

AQI: 1 - Good
PM2.5: 23 μg/m3
PM10: 23.5 μg/m3
Carbon Monoxide: 237 μg/m3
Nitrogen Dioxide: 31.7 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 42 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:51 AM
Sunset: 8:18 PM
Daylight: 14 hrs 54 mins
Moonrise: 10:22 AM
Moon Transit: 4:38 PM
Moonset: 10:42 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

6:20 AM - 8:50 AM
4:08 PM - 6:38 PM

Minor Periods

10:12 PM - 11:42 PM
9:52 AM - 11:22 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 18 at 1:36AM EDT until July 19 at 12:00PM EDT by NWS Boston/Norton MA

Effective: Sat July 18, 2026, 1:36 AM
Expires: Sat July 18, 2026, 8:00 PM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 30 kt and waves 2 to 4 feet expected. * WHERE...In Massachusetts coastal waters, Boston Harbor. In Rhode Island coastal waters, Narragansett Bay. * WHEN...From 11 AM this morning to noon EDT Sunday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Saturday, July 18, 2026

Weather Forecast

Smoky haze
93.7°F
59.5°F
72.8°F
67%
0.1 in
57%
0%
17 mph
4.7


Air Quality

AQI: 2 - Moderate
PM2.5: 36.7 μg/m3
PM10: 37.91 μg/m3
Carbon Monoxide: 201.21 μg/m3
Nitrogen Dioxide: 18.49 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 89.21 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:51 AM
Sunset: 8:18 PM
Daylight: 14 hrs 54 mins
Moonrise: 10:22 AM
Moon Transit: 4:38 PM
Moonset: 10:42 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

6:20 AM - 8:50 AM
4:08 PM - 6:38 PM

Minor Periods

10:12 PM - 11:42 PM
9:52 AM - 11:22 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
81.9°F
62.5°F
74°F
58%
0 in
17%
0%
14.5 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 4.92 μg/m3
PM10: 4.97 μg/m3
Carbon Monoxide: 167.75 μg/m3
Nitrogen Dioxide: 4.75 μg/m3
Sulphur Dioxide: 0.68 μg/m3
Ozone: 89.08 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:51 AM
Sunset: 8:18 PM
Daylight: 14 hrs 53 mins
Moonrise: 11:31 AM
Moon Transit: 5:21 PM
Moonset: 11:02 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

7:04 AM - 9:34 AM
4:51 PM - 7:21 PM

Minor Periods

12:00 AM - 12:00 AM
11:01 AM - 12:31 AM

Action Rating: 2 out of 5

Monday, July 20, 2026

Weather Forecast

Sunny
84.8°F
56.5°F
70.1°F
46%
0 in
1%
0%
10.1 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 6.13 μg/m3
PM10: 6.42 μg/m3
Carbon Monoxide: 152 μg/m3
Nitrogen Dioxide: 8.74 μg/m3
Sulphur Dioxide: 0.58 μg/m3
Ozone: 75.92 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 12:51 AM
Sunset: 8:17 PM
Daylight: 14 hrs 51 mins
Moonrise: 12:38 AM
Moon Transit: 6:05 PM
Moonset: 12:02 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

7:47 AM - 10:17 AM
5:35 PM - 8:05 PM

Minor Periods

12:08 AM - 1:38 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Sunny
84.1°F
58.9°F
71.2°F
69%
0.39 in
67%
0%
13.6 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 9.6 μg/m3
PM10: 11.86 μg/m3
Carbon Monoxide: 173.53 μg/m3
Nitrogen Dioxide: 7.8 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 88.5 μg/m3

Astronomical

Sunrise: 5:27 AM
Sun Transit: 12:51 AM
Sunset: 8:16 PM
Daylight: 14 hrs 49 mins
Moonrise: 1:44 PM
Moon Transit: 6:49 PM
Moonset: 12:23 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:31 AM - 11:01 AM
6:19 PM - 8:49 PM

Minor Periods

1:14 PM - 2:44 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Sunny
87.5°F
68.5°F
75.6°F
74%
0.71 in
76%
0%
13.2 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 2.29 μg/m3
PM10: 2.58 μg/m3
Carbon Monoxide: 165.67 μg/m3
Nitrogen Dioxide: 7.12 μg/m3
Sulphur Dioxide: 0.56 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:51 AM
Sunset: 8:15 PM
Daylight: 14 hrs 47 mins
Moonrise: 2:49 PM
Moon Transit: 7:34 PM
Moonset: 12:46 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

9:16 AM - 11:46 AM
7:04 PM - 9:34 PM

Minor Periods

2:19 PM - 3:49 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 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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