As of 22:41 MDT

Boise, ID weather in September

80°

Boise, Saturday, 8 August, 22:41

Clear. Feels like 80°. High 98°, low 62°.

Pressure29.80 inHg

Wind3.1 mph W

Humidity35%

Visibility6.2 mi

Dew point50°

See detailed hourly forecast

In September, Boise, ID averages a high of 78.6° and a low of 53.9°. About 0.6 inches of precipitation fall over the month (3 wet days). The record high is 103.5° (2022) and the record low 31.8° (1965). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	85.1°	58.3°	2%	98.4° (2025)	47.5° (1965)
2	84.7°	58.6°	2%	99.5° (2022)	42.8° (1964)
3	84.7°	58.6°	5%	100° (2007)	45° (1964)
4	85.1°	57.9°	7%	99° (1998)	46° (1971)
5	84.6°	58.3°	13%	100.4° (2020)	48.6° (1996)
6	83.3°	57.9°	8%	102.6° (2022)	44.6° (1996)
7	83.3°	57.4°	7%	103.5° (2022)	43.9° (1992)
8	82.4°	57.4°	15%	98.1° (2024)	45.5° (1976)
9	81.3°	56.3°	8%	97.2° (2021)	45.5° (1962)
10	80.8°	55.6°	7%	93° (1990)	43.9° (1964)
11	79.5°	55.2°	12%	94.3° (1990)	45.3° (2005)
12	78.4°	54.5°	5%	93.6° (2015)	43.7° (1970)
13	79°	53.8°	8%	96.4° (2020)	39.4° (1970)
14	78.8°	54.3°	8%	97.9° (2000)	37.8° (1970)
15	78.1°	54.3°	12%	93.7° (1995)	39.4° (1970)
16	77.2°	53.2°	7%	92.7° (2020)	41° (1970)
17	77.2°	53.2°	13%	95.5° (2020)	34.2° (1965)
18	76.6°	53.6°	12%	94.5° (1981)	31.8° (1965)
19	74.5°	52.3°	17%	91.9° (1984)	36° (1965)
20	73.6°	50.7°	15%	88.3° (2025)	37.2° (1983)
21	73.2°	50.2°	5%	91.2° (1967)	37.8° (1983)
22	74.7°	49.6°	8%	94.8° (1966)	38.7° (1968)
23	75.6°	50.7°	7%	94.1° (2001)	36.5° (1996)
24	75.7°	51.1°	12%	93.9° (2011)	34° (1961)
25	76.1°	50.9°	8%	92.3° (2024)	33.3° (1984)
26	75°	50.9°	10%	89.6° (1963)	37.2° (1970)
27	75°	50.5°	8%	93.7° (2022)	38.3° (1961)
28	75.4°	50°	8%	91.2° (1963)	33.8° (1999)
29	75.4°	50.2°	12%	92.7° (1963)	34.5° (1972)
30	73.9°	50.4°	17%	92.3° (1992)	35.1° (1982)