As of 10:00 MDT

Big Sky, MT weather in August

46°

Big Sky, Wednesday, 7 October, 10:00

Clear. Feels like 45°. High 70°, low 35°.

Pressure30.15 inHg

Wind3.2 mph SW

Humidity42%

Visibility6.2 mi

Dew point26°

See detailed hourly forecast

In August, Big Sky, MT averages a high of 72.3° and a low of 48.5°. About 2.2 inches of precipitation fall over the month (12 wet days). The record high is 86.7° (1961) and the record low 29.7° (1964). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	75.6°	51.4°	33%	86.4° (2000)	37.8° (1975)
2	74.7°	51.8°	38%	84.9° (2003)	42.3° (1975)
3	73.4°	50.5°	45%	86.4° (2024)	40.1° (1985)
4	74.1°	49.5°	37%	86° (1961)	37.4° (1980)
5	74.7°	49.8°	45%	86.7° (1961)	43.3° (1976)
6	74.5°	50.5°	38%	85.3° (1983)	41° (1996)
7	74.1°	50°	33%	84.7° (2001)	39.4° (1996)
8	72.9°	49.8°	43%	85.6° (2012)	39.2° (2025)
9	72.5°	48.6°	33%	83.1° (2000)	37° (2002)
10	74.7°	48.9°	28%	85.8° (2018)	37° (1974)
11	73.6°	50.4°	35%	85.6° (2003)	41.7° (1985)
12	72.7°	49.5°	42%	83.1° (2003)	36.7° (1985)
13	72.1°	48.6°	38%	83.8° (2003)	37.4° (1985)
14	72.5°	48.9°	35%	86.7° (2003)	36.5° (1985)
15	72.7°	48.6°	32%	86.2° (2003)	39.4° (1974)
16	72.1°	48.9°	33%	84° (2007)	35.6° (2009)
17	72.7°	48.7°	33%	83.7° (2023)	33.3° (1978)
18	71.8°	48.2°	48%	83.3° (2008)	33.3° (1978)
19	72°	48.2°	38%	81.9° (1961)	36.5° (1964)
20	71.8°	48°	40%	81.3° (2013)	36° (1964)
21	72°	48°	42%	82.8° (1969)	35.1° (1966)
22	71.4°	47.7°	47%	83.1° (1969)	35.8° (1966)
23	70.5°	46.9°	42%	82.8° (1969)	32.2° (1962)
24	70.3°	46.6°	40%	86.4° (1969)	31.8° (1992)
25	71.1°	46.4°	38%	84° (2008)	32° (1992)
26	70.9°	47.1°	43%	83.8° (2011)	32.4° (1992)
27	70.3°	46.9°	37%	82.9° (2011)	32.4° (1976)
28	70.5°	46.2°	27%	83.5° (2012)	30.9° (1960)
29	70.9°	46.8°	30%	80.8° (1998)	34° (1964)
30	70.2°	47.1°	33%	81.1° (2007)	29.7° (1964)
31	68°	45.9°	40%	83.5° (2016)	33.1° (2010)