As of 06:30 MDT

Sidney, MT weather in September

39°

Sidney, Wednesday, 7 October, 06:30

Overcast. Feels like 39°. High 68°, low 39°.

Pressure30.06 inHg

Wind0 mph N

Humidity81%

Visibility6.2 mi

Dew point34°

See detailed hourly forecast

In September, Sidney, MT averages a high of 72° and a low of 51.2°. About 1.6 inches of precipitation fall over the month (6 wet days). The record high is 101.8° (1998) and the record low 20.8° (1984). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	79.3°	57.2°	10%	99.1° (1983)	39° (1974)
2	79.2°	58.5°	17%	96.4° (2015)	39.7° (1974)
3	79°	56.8°	22%	97.9° (1978)	40.6° (1962)
4	78.6°	56.7°	18%	101.8° (1998)	41.7° (1962)
5	78.3°	56.5°	22%	101.3° (1978)	34.3° (1965)
6	77.5°	55.2°	22%	101.7° (1976)	36.1° (2025)
7	76.1°	54.3°	23%	97.2° (2022)	37.4° (1986)
8	75.2°	54.1°	17%	95.5° (1966)	32.5° (2020)
9	75.9°	54°	17%	99.1° (1994)	37.9° (2020)
10	75°	54°	22%	93.9° (2021)	36° (1965)
11	73°	53.4°	23%	91.8° (1966)	33.4° (1964)
12	72°	52.2°	28%	98.4° (1990)	32.9° (1989)
13	70°	50.7°	18%	91.4° (2006)	30.7° (1970)
14	70.7°	50°	17%	87.3° (1968)	30.7° (1993)
15	72°	51.1°	18%	91° (2002)	36.1° (1965)
16	72°	50.9°	22%	92.8° (2002)	33.8° (1965)
17	71.4°	50.5°	35%	92.5° (1989)	30.6° (1965)
18	70.3°	50.5°	30%	93.6° (2021)	31.5° (1965)
19	69.1°	49.5°	23%	92.8° (2009)	30.7° (1991)
20	66.9°	48.2°	23%	87.1° (2008)	34.7° (1985)
21	65.8°	46.4°	32%	82.9° (2025)	26.2° (1995)
22	66.6°	46.4°	15%	83.5° (2020)	27.7° (1983)
23	67.5°	47.3°	23%	92.8° (1992)	27.5° (1965)
24	69.1°	47.7°	17%	91° (1992)	28.4° (1984)
25	70.2°	47.5°	15%	93.4° (2014)	20.8° (1984)
26	69.1°	49.1°	10%	90.5° (2015)	25.2° (1984)
27	67.1°	47.1°	12%	88.2° (2021)	27° (1984)
28	67.8°	46.8°	17%	96.3° (2021)	28.2° (1984)
29	68.4°	46.9°	15%	92.8° (2024)	27.9° (1985)
30	67.8°	48°	17%	91.8° (1963)	27.1° (1961)