Water Temperature of the Boise River in Caldwell, ID

Current Water Temperature

76.1°F

Measurement Time: Wednesday, July 15, 2026, 1:45 PM MDT

Temperature Locations

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Local Points of Interest

Rotary Pond Park

Boise River

Station Name: BOISE RIVER AT CALDWELL, ID
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 2,343 feet

Nearest Address:
W Chicago Street
Caldwell, ID 83605-5407
Canyon County

GPS Coordinates: 43.67735278, -116.7011306

Nearby Water Temperatures

Boise River, Caldwell, ID (0.2 mi)
Boise River, Parma, ID (15.4 mi)
Snake River, Nyssa, OR (19.6 mi)
Snake River, King Hill, ID (88.6 mi)
Owyhee River, Bruneau, ID (98.2 mi)
Yankee Fork Salmon River, Sunbeam, ID (106.3 mi)
Meadow Creek, Stibnite, ID (106.8 mi)
East Fork South Fork Salmon River, Stibnite, ID (108.6 mi)
Sugar Creek, Yellow Pine, ID (110.1 mi)
East Fork Wallowa River, Joseph, OR (112.9 mi)
Box Canyon Springs, Wendell, ID (116.4 mi)
Briggs Spring, Buhl, ID (117.9 mi)
Snake River, Buhl, ID (122.2 mi)
Niagara Springs, Buhl, ID (123.8 mi)
Donner und Blitzen River, Frenchglen, OR (125.1 mi)

Weather for Caldwell, Idaho

Current Weather

93.9°F
Sunny
Sunny
92°F
86.4°F
25%
NNW 5.4 mph
11.3 mph
89.2°F
48.7°F
0 in
0%
9 mi
1012 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 100°F
L: 67°F
Sunny
Thu
H: 105°F
L: 67°F
Sunny
Fri
H: 104°F
L: 68°F
Sunny
Sat
H: 104°F
L: 71°F
Sunny
Sun
H: 105°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 6.9 μg/m3
PM10: 8.4 μg/m3
Carbon Monoxide: 135 μg/m3
Nitrogen Dioxide: 1.6 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 101 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:52 PM
Sunset: 9:26 PM
Daylight: 15 hrs 6 mins
Moonrise: 7:43 AM
Moon Transit: 3:19 PM
Moonset: 10:40 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:49 PM - 5:19 PM

Minor Periods

10:10 PM - 11:40 PM
7:13 AM - 8:43 AM

Action Rating: 3 out of 5

Red Flag Warning issued July 15 at 1:14PM MDT until July 16 at 9:00PM MDT by NWS Boise ID

Effective: Wed July 15, 2026, 1:14 PM
Expires: Thu July 16, 2026, 3:00 PM

...SCATTERED THUNDERSTORMS OVER SOUTHWEST IDAHO ZONES THURSDAY AFTERNOON AND EVENING... .Scattered thunderstorms are expected across southwestern Idaho Thursday afternoon. Expect gusty and erratic winds of 45-60 mph in the vicinity of these thunderstorms. The National Weather Service in Boise has issued a Red Flag Warning for lightning, which is in effect from noon to 9 PM MDT Thursday. * AFFECTED AREA...In Idaho, Fire Weather Zones 420 Treasure Valley BLM, 423 Owyhee Mountains, 424 Western Twin Falls BLM and 426 Southern Highlands. * TIMING...From noon to 9 PM MDT Thursday. * THUNDERSTORMS...Scattered coverage with abundant lightning. * OUTFLOW WINDS...Gusty erratic winds to 45-60 mph. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended.

A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly.


Heat Advisory issued July 15 at 12:43PM MDT until July 16 at 9:00PM MDT by NWS Boise ID

Effective: Wed July 15, 2026, 12:43 PM
Expires: Thu July 16, 2026, 3:00 PM

* WHAT...Temperatures up to 103 expected. * WHERE...Idaho and Oregon Treasure Valley zones and the Upper Weiser River zone. * WHEN...From noon MDT /11 AM PDT/ to 9 PM MDT /8 PM PDT/ Thursday. * IMPACTS...Hot temperatures may cause heat illnesses, especially for the young, elderly, and animals.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Wednesday, July 15, 2026

Weather Forecast

Sunny
99.9°F
66.6°F
82.6°F
49%
0 in
1%
0%
8.7 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 7.28 μg/m3
PM10: 10.04 μg/m3
Carbon Monoxide: 136.96 μg/m3
Nitrogen Dioxide: 5.57 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 87.96 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:52 PM
Sunset: 9:26 PM
Daylight: 15 hrs 6 mins
Moonrise: 7:43 AM
Moon Transit: 3:19 PM
Moonset: 10:40 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:49 PM - 5:19 PM

Minor Periods

10:10 PM - 11:40 PM
7:13 AM - 8:43 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
104.7°F
67.1°F
82.7°F
36%
0.06 in
57%
0%
17.4 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 7.04 μg/m3
PM10: 8.52 μg/m3
Carbon Monoxide: 141.13 μg/m3
Nitrogen Dioxide: 8.06 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 79.42 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 1:52 PM
Sunset: 9:25 PM
Daylight: 15 hrs 5 mins
Moonrise: 9:04 AM
Moon Transit: 4:11 PM
Moonset: 11:04 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:41 PM - 6:11 PM

Minor Periods

12:00 AM - 12:00 AM
8:34 AM - 10:04 AM

Action Rating: 3 out of 5

Friday, July 17, 2026

Weather Forecast

Sunny
103.7°F
68.1°F
84.6°F
39%
0.01 in
17%
0%
16.1 mph
9.8


Air Quality

AQI: 1 - Good
PM2.5: 5.73 μg/m3
PM10: 6.9 μg/m3
Carbon Monoxide: 121.17 μg/m3
Nitrogen Dioxide: 6.32 μg/m3
Sulphur Dioxide: 0.39 μg/m3
Ozone: 78.79 μg/m3

Astronomical

Sunrise: 6:21 AM
Sun Transit: 1:53 PM
Sunset: 9:24 PM
Daylight: 15 hrs 3 mins
Moonrise: 10:20 AM
Moon Transit: 5:00 PM
Moonset: 12:04 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

12:25 AM - 2:55 AM
4:30 PM - 7:00 PM

Minor Periods

9:50 AM - 11:20 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, July 18, 2026

Weather Forecast

Sunny
104.2°F
70.7°F
86.6°F
35%
0.01 in
17%
0%
13 mph
10.3


Air Quality

AQI: 1 - Good
PM2.5: 4.97 μg/m3
PM10: 6.24 μg/m3
Carbon Monoxide: 120 μg/m3
Nitrogen Dioxide: 5.38 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 81.92 μg/m3

Astronomical

Sunrise: 6:22 AM
Sun Transit: 1:53 PM
Sunset: 9:24 PM
Daylight: 15 hrs 1 mins
Moonrise: 11:32 AM
Moon Transit: 5:45 PM
Moonset: 12:26 AM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

1:12 AM - 3:42 AM
5:15 PM - 7:45 PM

Minor Periods

11:02 AM - 12:32 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
104.8°F
67°F
86.3°F
19%
0 in
1%
0%
11.6 mph
10.2


Air Quality

AQI: 1 - Good
PM2.5: 5.3 μg/m3
PM10: 7.06 μg/m3
Carbon Monoxide: 112.78 μg/m3
Nitrogen Dioxide: 4.87 μg/m3
Sulphur Dioxide: 0.38 μg/m3
Ozone: 88.17 μg/m3

Astronomical

Sunrise: 6:23 AM
Sun Transit: 1:53 PM
Sunset: 9:23 PM
Daylight: 15 hrs mins
Moonrise: 12:42 AM
Moon Transit: 6:29 PM
Moonset: 12:45 AM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

1:57 AM - 4:27 AM
5:59 PM - 8:29 PM

Minor Periods

12:12 AM - 1:42 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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