Boise weather records
Record high and low temperatures for Boise, by month, by season, and all-time, with the dates they occurred, across 1980–2026 of daily climate history. Its hottest day on record reached 109°F on 2002-07-11; its coldest fell to -25°F on 1990-12-22.
Records by month
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have ever been in each calendar month, so each column shows its record high and its record low. Tap a month for its full averages and typical range.
| Month | Daytime high | Overnight low |
|---|---|---|
| January | 62°F2024-01-31
10°F1991-01-04
|
48°F1997-01-01
-7°F2017-01-07
|
| February | 68°F1986-02-24
10°F1989-02-05
|
54°F2015-02-06
-13°F1985-02-04
|
| March | 83°F2026-03-21
32°F1993-03-01
|
56°F1987-03-05
13°F1993-03-01
|
| April | 92°F2012-04-23
42°F2024-04-05
|
62°F1987-04-28
24°F1999-04-02
|
| May | 101°F2003-05-28
48°F1983-05-09
|
71°F2009-05-19
29°F2022-05-10
|
| June | 108°F2015-06-28
54°F1980-06-02
|
79°F2021-06-30
37°F1984-06-01
|
| July | 109°F2002-07-11
67°F1983-07-02
|
82°F2005-07-22
42°F1986-07-05
|
| August | 108°F2018-08-10
62°F1989-08-24
|
79°F2004-08-02
41°F1992-08-25
|
| September | 104°F2022-09-03
53°F1986-09-27
|
74°F1998-09-05
31°F1984-09-25
|
| October | 94°F1992-10-01
35°F2002-10-31
|
66°F1992-10-01
14°F2019-10-30
|
| November | 74°F2020-11-05
19°F1985-11-26
|
58°F1999-11-08
-2°F2014-11-16
|
| December | 61°F2025-12-10
-8°F1990-12-22
|
55°F2014-12-12
-25°F1990-12-22
|
Records by season
The warmest (▲) and coldest (▼) both the daytime high and the overnight low have reached in each meteorological season (Northern Hemisphere, each a three-month span).
| Season | Daytime high | Overnight low |
|---|---|---|
| Winter (Dec–Feb) | 68°F1986-02-24
-8°F1990-12-22
|
55°F2014-12-12
-25°F1990-12-22
|
| Spring (Mar–May) | 101°F2003-05-28
32°F1993-03-01
|
71°F2009-05-19
13°F1993-03-01
|
| Summer (Jun–Aug) | 109°F2002-07-11
54°F1980-06-02
|
82°F2005-07-22
37°F1984-06-01
|
| Autumn (Sep–Nov) | 104°F2022-09-03
19°F1985-11-26
|
74°F1998-09-05
-2°F2014-11-16
|
All-time records
The most extreme value Boise has recorded for each metric across its entire history.
High
Low
Feels-like
Humidity
Wind
Gust
Precip
For rainfall, the “driest” figure is the longest run of consecutive days without measurable rain, dated to when that dry spell began.