As of 05:38 CDT

Grafton, WI weather in September

60°

Grafton, Sunday, 9 August, 05:38

Partly cloudy. Feels like 60°. High 76°, low 59°.

Pressure30.00 inHg

Wind6.1 mph SW

Humidity95%

Visibility6.2 mi

Dew point58°

See detailed hourly forecast

In September, Grafton, WI averages a high of 69.3° and a low of 60.1°. About 3.1 inches of precipitation fall over the month (10 wet days). The record high is 92.8° (2023) and the record low 39.4° (2018). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	73.8°	64.9°	28%	83.7° (2022)	54.9° (2017)
2	74.5°	65.1°	27%	87.1° (2023)	52° (2025)
3	74.1°	64.9°	23%	92.8° (2023)	51.6° (1974)
4	73.4°	64.2°	25%	88.3° (2023)	45.1° (2025)
5	72.9°	63.7°	25%	84.6° (2023)	49.5° (2019)
6	73°	64°	35%	85.1° (1990)	47.5° (2025)
7	73°	63.1°	37%	84° (1960)	45.5° (2025)
8	72°	62.8°	30%	84.6° (1960)	48.9° (2025)
9	71.4°	62.2°	28%	85.1° (1983)	51.4° (2020)
10	71.8°	61.9°	28%	86° (2013)	49.5° (2020)
11	71.4°	61.9°	27%	88.3° (2021)	49.5° (2014)
12	71.4°	61.7°	33%	81.1° (2005)	48° (2014)
13	70.5°	61.9°	38%	81° (2005)	44.6° (2014)
14	69.8°	60.1°	38%	78.4° (1994)	48.2° (2023)
15	68.5°	59.7°	32%	79.7° (1994)	45.7° (2007)
16	68.7°	59.7°	33%	81° (2017)	50° (2014)
17	69.3°	60.3°	38%	86.2° (2018)	50.4° (1981)
18	69.3°	60.1°	38%	82.4° (2022)	49.5° (1973)
19	68.9°	60.4°	40%	81.7° (2024)	43.9° (2020)
20	68.5°	59°	40%	84.6° (2024)	44.2° (1991)
21	67.3°	58.5°	38%	80.8° (2018)	45.5° (1983)
22	66.2°	57.2°	43%	86.9° (2017)	40.3° (1995)
23	65.5°	55.8°	28%	88.3° (2017)	42.3° (1974)
24	65.5°	56.5°	33%	85.5° (2017)	45° (1989)
25	66°	56.8°	32%	82.9° (2017)	45.9° (2001)
26	66.2°	56.8°	37%	83.7° (2017)	42.8° (1984)
27	65.1°	56.1°	30%	82° (2025)	43.2° (1991)
28	63.5°	55°	30%	75° (1986)	40.5° (2022)
29	63.9°	54.5°	35%	76.8° (2025)	39.4° (2018)
30	64.2°	54.7°	25%	83.7° (2019)	41.5° (1993)