Boise, Idaho, United States weather records
Record high and low temperatures for Boise, Idaho, United States, by month, by season, and all-time, with the dates they occurred, across 1981–2026 of daily climate history. Its hottest day on record reached 110°F on 2002-07-12; its coldest fell to -15°F on 1990-12-29.
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 | 58°F2024-01-31
8°F1982-01-06
|
41°F2003-01-31
-9°F2017-01-07
|
| February | 65°F1995-02-24
10°F1989-02-04
|
42°F2015-02-06
-9°F1989-02-05
|
| March | 80°F2026-03-20
28°F1989-03-03
|
52°F2026-03-20
14°F1989-03-03
|
| April | 87°F1992-04-29
37°F2023-04-03
|
57°F1987-04-28
22°F1997-04-02
|
| May | 100°F2003-05-28
42°F2022-05-09
|
66°F1986-05-31
25°F1999-05-10
|
| June | 108°F2015-06-28
48°F1981-06-13
|
76°F2015-06-29
35°F1981-06-14
|
| July | 110°F2002-07-12
63°F1982-07-01
|
77°F2002-07-12
42°F1986-07-05
|
| August | 108°F2018-08-10
58°F1989-08-24
|
78°F2024-08-03
41°F1992-08-24
|
| September | 104°F2022-09-06
50°F1986-09-25
|
73°F1998-09-05
30°F1985-09-29
|
| October | 92°F2010-10-02
33°F2019-10-29
|
64°F2010-10-02
18°F2002-10-31
|
| November | 74°F1999-11-06
18°F2010-11-24
|
53°F1999-11-07
4°F1985-11-23
|
| December | 60°F2021-12-01
-1°F1990-12-29
|
46°F2014-12-11
-15°F1990-12-29
|
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) | 65°F1995-02-24
-1°F1990-12-29
|
46°F2014-12-11
-15°F1990-12-29
|
| Spring (Mar–May) | 100°F2003-05-28
28°F1989-03-03
|
66°F1986-05-31
14°F1989-03-03
|
| Summer (Jun–Aug) | 110°F2002-07-12
48°F1981-06-13
|
78°F2024-08-03
35°F1981-06-14
|
| Autumn (Sep–Nov) | 104°F2022-09-06
18°F2010-11-24
|
73°F1998-09-05
4°F1985-11-23
|
All-time records
The most extreme value Boise has recorded for each metric across its entire history.
High
Low
Feels-like
Humidity
Wind
Precip
For rainfall, the “driest” figure is the longest run of consecutive days without measurable rain, dated to when that dry spell began.