As of 20:27 MDT

Arpan, SD weather in September

62°

Arpan, Wednesday, 7 October, 20:27

Overcast. Feels like 60°. High 81°, low 51°.

Pressure30.06 inHg

Wind6.1 mph E

Humidity39%

Visibility6.2 mi

Dew point38°

See detailed hourly forecast

In September, Arpan, SD averages a high of 74.9° and a low of 52.1°. About 1.3 inches of precipitation fall over the month (5 wet days). The record high is 102.2° (1960) and the record low 19.2° (1984). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	81.7°	58.5°	17%	99° (2012)	44.4° (1965)
2	82.4°	59°	18%	99.5° (1960)	42.6° (1974)
3	82°	57.9°	7%	98.1° (2007)	40.1° (1974)
4	81.7°	57.9°	22%	102.2° (1960)	38.5° (1962)
5	81.7°	57.7°	17%	101.8° (1978)	39.2° (1965)
6	80.8°	56.5°	18%	101.7° (1978)	39.7° (2025)
7	79.5°	55.9°	13%	99.1° (2022)	42.1° (1986)
8	78.3°	55°	10%	93.9° (1994)	38.8° (2020)
9	78.3°	54.3°	13%	98.1° (1994)	34° (2020)
10	78.4°	54.5°	13%	97° (1998)	34° (1962)
11	76.1°	54.5°	18%	93.4° (2025)	34.7° (1989)
12	74.8°	54°	22%	96.3° (1990)	29.3° (2014)
13	72.7°	51.6°	27%	92.5° (2015)	34.5° (2014)
14	73.8°	51.4°	22%	90.9° (2020)	31.6° (1961)
15	74.3°	51.6°	20%	90° (2012)	35.6° (1973)
16	75°	51.6°	8%	93.9° (2007)	33.1° (1965)
17	74.1°	51.6°	25%	93.2° (1989)	31.1° (1965)
18	73.2°	51.3°	27%	95.5° (1998)	30.6° (1965)
19	72.1°	50.5°	22%	90.5° (2022)	28.8° (1965)
20	70.2°	49.1°	12%	92.3° (1960)	29.8° (1965)
21	68.4°	47.8°	22%	85.3° (2015)	28.6° (1995)
22	69.4°	47.1°	12%	91.9° (2007)	32.2° (1995)
23	69.8°	47.3°	22%	91.2° (1992)	26.4° (1965)
24	71.1°	47.5°	15%	92.1° (2020)	30.6° (1984)
25	72.3°	47.8°	20%	92.5° (2014)	27.3° (1984)
26	73°	48.6°	7%	95.9° (2024)	30° (1965)
27	70°	48.4°	17%	88.3° (2021)	30.2° (1984)
28	70.9°	47.1°	15%	93.7° (2021)	19.2° (1984)
29	70.7°	48.2°	15%	97.3° (2024)	22.3° (1984)
30	71.6°	48.4°	10%	91.6° (1989)	23.7° (1985)