496
FPUS55 KBOI 182031
ZFPBOI
ZONE FORECASTS FOR SOUTHWEST IDAHO/SOUTHEAST OREGON
NATIONAL WEATHER SERVICE BOISE ID
230 PM MDT MON MAY 18 2026
SPOT TEMPERATURES ARE FOR TONIGHT, TUESDAY, TUESDAY NIGHT, AND
WEDNESDAY.
IDZ011-190400-
WEST CENTRAL MOUNTAINS-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN AND SNOW
SHOWERS THIS EVENING, THEN MOSTLY CLEAR AFTER MIDNIGHT. CHANCE OF
PRECIPITATION 20 PERCENT. LOWS 28 TO 38.
TUESDAY
SUNNY. HIGHS 52 TO 66.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 33 TO 43.
WEDNESDAY
PARTLY SUNNY. HIGHS 54 TO 69.
WEDNESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
AREAS OF FOG AFTER MIDNIGHT. LOWS 34 TO 44.
THURSDAY
AREAS OF FOG IN THE MORNING. SUNNY. HIGHS 58 TO 72.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 35 TO 45.
FRIDAY AND FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 60 TO 74. LOWS
37 TO 47.
SATURDAY
SUNNY. HIGHS 65 TO 79.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 41 TO 51.
SUNDAY
SUNNY. HIGHS 66 TO 80.
SUNDAY NIGHT
INCREASING CLOUDS. LOWS 41 TO 51.
MEMORIAL DAY
PARTLY CLOUDY WITH A 20 PERCENT CHANCE OF RAIN
SHOWERS. HIGHS 61 TO 74.
TEMPERATURE
MCCALL 29 61 33 64
=
IDZ013-190400-
BOISE MOUNTAINS-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 24 TO
39. BREEZY.
TUESDAY
SUNNY. HIGHS 54 TO 68.
TUESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 27 TO 42.
WEDNESDAY
MOSTLY SUNNY. HIGHS 58 TO 72.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 29 TO 44.
THURSDAY
SUNNY. HIGHS 61 TO 76.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 31 TO 46.
FRIDAY AND FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 63 TO 78. LOWS
33 TO 48.
SATURDAY THROUGH SUNDAY NIGHT
MOSTLY CLEAR. HIGHS 70 TO 85.
LOWS 38 TO 53.
MEMORIAL DAY
MOSTLY SUNNY. HIGHS 66 TO 80.
TEMPERATURE
IDAHO CITY 29 67 33 71
=
IDZ028-190400-
CAMAS PRAIRIE-
230 PM MDT MON MAY 18 2026
TONIGHT
MOSTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 27 TO
32. NORTH WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH THIS EVENING,
BECOMING LIGHT AFTER MIDNIGHT.
TUESDAY
SUNNY. HIGHS 59 TO 64. LIGHT WINDS IN THE MORNING,
BECOMING SOUTHWEST 10 TO 15 MPH IN THE AFTERNOON.
TUESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 29 TO 34. WEST WINDS 10 TO 15 MPH IN THE EVENING, BECOMING
LIGHT AFTER MIDNIGHT.
WEDNESDAY
INCREASING CLOUDS. HIGHS 64 TO 69. LIGHT WINDS IN
THE MORNING, BECOMING WEST 10 TO 15 MPH WITH GUSTS TO 25 MPH IN
THE AFTERNOON.
WEDNESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 32 TO 37. BREEZY. NORTHWEST WINDS 10 TO 20 MPH.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 66 TO 73.
LOWS 33 TO 40.
SATURDAY THROUGH MEMORIAL DAY
MOSTLY CLEAR. HIGHS 74 TO 82.
LOWS 38 TO 45. WINDY.
TEMPERATURE
FAIRFIELD 27 62 29 67
=
IDZ033-190400-
UPPER WEISER RIVER-
230 PM MDT MON MAY 18 2026
TONIGHT
DECREASING CLOUDS. LOWS 37 TO 42. BREEZY. NORTH WINDS
10 TO 20 MPH WITH GUSTS TO 30 MPH THIS EVENING, DECREASING TO
AROUND 10 MPH AFTER MIDNIGHT.
TUESDAY
SUNNY. HIGHS 65 TO 71. LIGHT WINDS.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 41 TO 46. NORTH WINDS UP TO
10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 68 TO 75. LIGHT WINDS.
WEDNESDAY NIGHT
MOSTLY CLEAR. LOWS 43 TO 48. NORTH WINDS 10 TO
15 MPH.
THURSDAY
SUNNY. HIGHS 72 TO 78.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 44 TO 49.
FRIDAY AND FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 73 TO 80. LOWS
46 TO 51.
SATURDAY
SUNNY. HIGHS 79 TO 85.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 49 TO 54.
SUNDAY
SUNNY. HIGHS 80 TO 86.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 49 TO 54.
HIGHS 73 TO 79.
TEMPERATURE
COUNCIL 39 69 42 72
CAMBRIDGE 37 71 42 75
=
ORZ064-190400-
OREGON LOWER TREASURE VALLEY-
230 PM MDT MON MAY 18 2026 /130 PM PDT MON MAY 18 2026/
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 40 TO
45. NORTHWEST WINDS 10 TO 15 MPH.
TUESDAY
SUNNY. HIGHS 71 TO 76. LIGHT WINDS.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 43 TO 48. LIGHT WINDS IN THE
EVENING, BECOMING NORTHWEST UP TO 10 MPH AFTER MIDNIGHT.
WEDNESDAY
MOSTLY SUNNY. HIGHS 73 TO 78. LIGHT WINDS.
WEDNESDAY NIGHT
MOSTLY CLEAR. LOWS 46 TO 51. NORTH WINDS 10 TO
15 MPH WITH GUSTS TO 25 MPH.
THURSDAY
SUNNY. HIGHS 76 TO 81.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 47 TO 52.
FRIDAY AND FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 78 TO 83. LOWS
48 TO 53.
SATURDAY
SUNNY. HIGHS 83 TO 88.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 53 TO 58.
SUNDAY
SUNNY. HIGHS 85 TO 90.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 51 TO 56.
HIGHS 78 TO 83.
TEMPERATURE
ONTARIO 41 74 44 76
=
IDZ012-190400-
LOWER TREASURE VALLEY-
230 PM MDT MON MAY 18 2026
TONIGHT
DECREASING CLOUDS. LOWS 39 TO 44. NORTHWEST WINDS
10 TO 15 MPH. GUSTS TO 25 MPH THIS EVENING.
TUESDAY
SUNNY. HIGHS 70 TO 75. NORTHWEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
INCREASING CLOUDS. LOWS 42 TO 47. LIGHT WINDS.
WEDNESDAY
MOSTLY SUNNY. HIGHS 73 TO 78. NORTHWEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
MOSTLY CLEAR. LOWS 45 TO 50. NORTH WINDS 10 TO
15 MPH.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 75 TO 83.
LOWS 45 TO 52.
SATURDAY
SUNNY. HIGHS 84 TO 89.
SATURDAY NIGHT
DECREASING CLOUDS. LOWS 52 TO 57.
SUNDAY
SUNNY. HIGHS 85 TO 90.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 50 TO 55.
HIGHS 79 TO 84.
TEMPERATURE
CALDWELL 40 73 43 76
=
IDZ014-190400-
UPPER TREASURE VALLEY-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 36 TO
41. BREEZY. NORTHWEST WINDS 10 TO 20 MPH WITH GUSTS TO 30 MPH
THIS EVENING, DECREASING TO AROUND 10 MPH AFTER MIDNIGHT.
TUESDAY
SUNNY. HIGHS 69 TO 74. NORTHWEST WINDS UP TO 10 MPH
WITH GUSTS TO 20 MPH.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 38 TO 45. NORTH WINDS AROUND
10 MPH IN THE EVENING, BECOMING LIGHT AFTER MIDNIGHT. GUSTS TO
20 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 73 TO 78. LIGHT WINDS IN THE
MORNING, BECOMING NORTHWEST AROUND 10 MPH IN THE AFTERNOON. GUSTS
TO 20 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 42 TO 47. NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 75 TO 83.
LOWS 42 TO 50. BREEZY.
SATURDAY THROUGH MEMORIAL DAY
MOSTLY CLEAR. HIGHS 82 TO 92.
LOWS 49 TO 55. BREEZY.
TEMPERATURE
BOISE 41 71 45 74
MOUNTAIN HOME 36 72 39 76
=
IDZ016-190400-
WESTERN MAGIC VALLEY-
230 PM MDT MON MAY 18 2026
..FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM MDT TUESDAY
TONIGHT
MOSTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 33 TO
38. WEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH THIS EVENING,
SHIFTING TO SOUTHEAST AFTER MIDNIGHT.
TUESDAY
PATCHY FROST IN THE MORNING. SUNNY. HIGHS 65 TO 70.
SOUTH WINDS AROUND 10 MPH IN THE MORNING, SHIFTING TO WEST IN THE
AFTERNOON.
TUESDAY NIGHT
DECREASING CLOUDS. LOWS 36 TO 41. WEST WINDS
AROUND 10 MPH IN THE EVENING, SHIFTING TO SOUTHEAST AFTER
MIDNIGHT. GUSTS TO 20 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 70 TO 75. SOUTHEAST WINDS UP TO
10 MPH IN THE MORNING, SHIFTING TO WEST IN THE AFTERNOON.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 41 TO 46. WEST WINDS
10 TO 15 MPH. GUSTS TO 25 MPH IN THE EVENING.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 71 TO 79.
LOWS 40 TO 47.
SATURDAY THROUGH MEMORIAL DAY
MOSTLY CLEAR. HIGHS 80 TO 88.
LOWS 47 TO 53. BREEZY.
TEMPERATURE
JEROME 35 66 39 72
TWIN FALLS 36 66 39 71
=
IDZ029-190400-
OWYHEE MOUNTAINS-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 33 TO
42.
TUESDAY
SUNNY. HIGHS 62 TO 67.
TUESDAY NIGHT
INCREASING CLOUDS. LOWS 37 TO 46.
WEDNESDAY
MOSTLY SUNNY. HIGHS 65 TO 70.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 39 TO 48.
THURSDAY
SUNNY. HIGHS 67 TO 72. BREEZY.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 40 TO 50.
FRIDAY AND FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 70 TO 75. LOWS
43 TO 52.
SATURDAY
SUNNY. HIGHS 76 TO 81.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 47 TO 57.
SUNDAY
SUNNY. HIGHS 78 TO 83.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 47 TO 55.
HIGHS 72 TO 78.
=
IDZ015-190400-
SOUTHWEST HIGHLANDS-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 31 TO
37. BREEZY.
TUESDAY
SUNNY. HIGHS 60 TO 68.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 35 TO 40.
WEDNESDAY
MOSTLY SUNNY. HIGHS 66 TO 73.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 39 TO 44.
THURSDAY AND THURSDAY NIGHT
MOSTLY CLEAR. HIGHS 68 TO 75. LOWS
39 TO 44. BREEZY.
FRIDAY
MOSTLY SUNNY. HIGHS 71 TO 78.
FRIDAY NIGHT AND SATURDAY
MOSTLY CLEAR. LOWS 41 TO 47. HIGHS
77 TO 84.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 45 TO 52.
SUNDAY
SUNNY. HIGHS 81 TO 87.
SUNDAY NIGHT
DECREASING CLOUDS. LOWS 45 TO 51.
MEMORIAL DAY
SUNNY. HIGHS 78 TO 83.
=
IDZ030-190400-
SOUTHERN TWIN FALLS COUNTY-
230 PM MDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 32 TO
37.
TUESDAY
SUNNY. HIGHS 61 TO 66.
TUESDAY NIGHT
DECREASING CLOUDS. LOWS 36 TO 41.
WEDNESDAY
MOSTLY SUNNY. HIGHS 68 TO 73.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 41 TO 46.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 68 TO 77.
LOWS 40 TO 48. BREEZY.
SATURDAY AND SATURDAY NIGHT
PARTLY CLOUDY. HIGHS 78 TO 83.
LOWS 48 TO 53.
SUNDAY
SUNNY. HIGHS 82 TO 87.
SUNDAY NIGHT
DECREASING CLOUDS. LOWS 48 TO 53.
MEMORIAL DAY
SUNNY. HIGHS 80 TO 85. BREEZY.
=
ORZ062-190400-
BAKER COUNTY-
130 PM PDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY WITH A SLIGHT CHANCE OF RAIN SHOWERS
THIS EVENING, THEN MOSTLY CLEAR AFTER MIDNIGHT. CHANCE OF RAIN
20 PERCENT. LOWS 31 TO 41. NORTH WINDS 10 TO 15 MPH WITH GUSTS TO
30 MPH THIS EVENING, BECOMING LIGHT AFTER MIDNIGHT.
TUESDAY
SUNNY. HIGHS 64 TO 71. NORTHWEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 35 TO 45. NORTHWEST WINDS UP
TO 10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 66 TO 74. NORTHWEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
MOSTLY CLEAR. LOWS 36 TO 46. BREEZY. NORTHWEST
WINDS 10 TO 20 MPH. GUSTS TO 40 MPH IN THE EVENING.
THURSDAY
SUNNY. HIGHS 69 TO 77.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 38 TO 49.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 73 TO 83. LOWS
41 TO 51.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 44 TO 54.
SUNDAY
SUNNY. HIGHS 77 TO 85.
SUNDAY NIGHT
PARTLY CLOUDY. LOWS 42 TO 52.
MEMORIAL DAY
PARTLY CLOUDY WITH A 20 PERCENT CHANCE OF RAIN
SHOWERS. HIGHS 69 TO 77. BREEZY.
TEMPERATURE
BAKER CITY 32 67 35 69
=
ORZ061-190400-
HARNEY COUNTY-
130 PM PDT MON MAY 18 2026
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 31 TO
38. NORTH WINDS 10 TO 15 MPH.
TUESDAY
SUNNY. HIGHS 63 TO 70. WEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
INCREASING CLOUDS. LOWS 34 TO 42. NORTHWEST
WINDS UP TO 10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 67 TO 74. NORTHWEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 36 TO 45. NORTH WINDS
10 TO 15 MPH WITH GUSTS TO 25 MPH.
THURSDAY
SUNNY. HIGHS 69 TO 77.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 38 TO 46.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 72 TO 82. LOWS
40 TO 49.
SATURDAY NIGHT
DECREASING CLOUDS. LOWS 42 TO 51.
SUNDAY
SUNNY. HIGHS 77 TO 84.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 40 TO 49.
HIGHS 69 TO 77.
TEMPERATURE
BURNS 31 69 34 73
=
ORZ063-190400-
MALHEUR COUNTY-
230 PM MDT MON MAY 18 2026 /130 PM PDT MON MAY 18 2026/
TONIGHT
PARTLY CLOUDY THIS EVENING, THEN CLEARING. LOWS 32 TO
42. NORTH WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH THIS EVENING,
BECOMING LIGHT AFTER MIDNIGHT.
TUESDAY
SUNNY. HIGHS 65 TO 72. NORTHWEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 36 TO 46. NORTH WINDS UP TO
10 MPH IN THE EVENING, BECOMING LIGHT AFTER MIDNIGHT.
WEDNESDAY
MOSTLY SUNNY. HIGHS 69 TO 76. NORTH WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 39 TO 49. BREEZY. NORTH
WINDS 10 TO 20 MPH WITH GUSTS TO 30 MPH.
THURSDAY
SUNNY. HIGHS 71 TO 78.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 40 TO 50.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 76 TO 86. LOWS
43 TO 51.
SATURDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 46 TO 55.
SUNDAY
SUNNY. HIGHS 81 TO 88.
SUNDAY NIGHT AND MEMORIAL DAY
PARTLY CLOUDY. LOWS 45 TO 53.
HIGHS 74 TO 82.
=
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