Area Conditions for Boise, ID
 
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Temperature: 71 oF
Feels Like: 71 oF
Humidity: 35%
Barometer: 30
Dew Point: 42 oF
Wind Dir.: NNW
Wind Speed: 10 mph
Sunrise: 7:28
Sunset: 7:49
Observation: No Report
Radar
As reported at ID BOISE WEST AIRFIELD (155001), ID at 5:00 PM

5-day Forecast for Boise, ID
Date Fri
9/18		 Sat
9/19		 Sun
9/20		 Mon
9/21		 Tue
9/22
Weather Condition Rain Rain Clear Clear Clear
Weather Rain Rain Clear Clear Clear
Temperature (°F)
Low/High		 59/73 54/77 55/81 56/84 58/85
Feels Like (°F)
Low/High		 59/73 54/77 55/81 56/84 58/85
Dew Point (°F) 43 48 45 43 39
Humidity (%) 35 50 40 35 28
Wind Speed (mph) 9 7 4 5 5
Precipitation
Chance (%)		 63 50 - - -
Precipitation
Amount (inches)
S=Snow, L=Liquid		 Rain
0.03		 Rain
0.04		 None None None
Evapo-
transpiration
(inches/day)		 0.2 0.16 0.16 0.18 0.19

County Forecast for Boise , ID
 
190400-
Upper Treasure Valley-
230 PM MDT Fri Sep 18 2026

..flash flood watch in effect until midnight mdt tonight   
Tonight   Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Patchy smoke this evening. Areas of fog after midnight. Chance of rain 30 percent. Lows 48 to 54. Northwest winds 10 to 15 mph. Gusts to 25 mph this evening.
Saturday   Areas of fog in the morning. Mostly sunny. Highs 73 to 78. Northwest winds 10 to 15 mph.
Saturday night   Mostly clear. Areas of fog after midnight. Lows 48 to 54. Northwest winds up to 10 mph in the evening, becoming light after midnight. Gusts to 20 mph.
Sunday   Areas of fog in the morning. Sunny. Highs 78 to 83. Southeast winds up to 10 mph.
Sunday night   Mostly clear. Patchy fog after midnight. Lows 50 to 56. East winds up to 10 mph.
Monday   Areas of fog in the morning. Sunny. Highs 80 to 85.
Monday night and tuesday   Partly cloudy. Lows 52 to 57. Highs 81 to 86.
Tuesday night through thursday   Mostly clear. Lows 51 to 58. Highs 82 to 90. Breezy.
Thursday night and friday   Partly cloudy. Lows 54 to 61. Highs 84 to 89. Breezy. && TEMPERATURE Boise 54 77 54 81 Mountain Home 49 77 48 81

DTN Weather Summary

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Bryce Anderson – DTN Meteorologist
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Heavy Rain Moving Through Northern US This Weekend

» More DTN Weather Commentary
Posted at 11:40AM Fri Sep 18, 2026 CDT
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