As of 22:46 CDT

Grafton, WI weather in August

65°

Grafton, Saturday, 8 August, 22:46

Clear. Feels like 65°. High 81°, low 64°.

Pressure30.00 inHg

Wind6.8 mph W

Humidity87%

Visibility6.2 mi

Dew point60°

See detailed hourly forecast

In August, Grafton, WI averages a high of 75.8° and a low of 66.7°. About 3.5 inches of precipitation fall over the month (10 wet days). The record high is 96.3° (2023) and the record low 50.9° (2025). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	77.5°	67.5°	27%	88.7° (1988)	53.6° (2019)
2	77.4°	67.6°	35%	90.3° (1964)	54.3° (2025)
3	77.2°	67.3°	33%	89.4° (2022)	57° (2025)
4	75.9°	66.9°	32%	88.7° (2018)	53.8° (2020)
5	75.7°	66.6°	30%	90.9° (2018)	55.8° (2020)
6	76.1°	66.7°	35%	86.9° (2022)	57.2° (2020)
7	76.6°	67.6°	35%	85.8° (1980)	56.8° (2020)
8	77.5°	67.8°	48%	87.4° (2001)	57.7° (1972)
9	76.8°	67.6°	33%	88.9° (2025)	52.5° (1972)
10	76.3°	66.6°	38%	89.8° (2021)	55.4° (2024)
11	75.2°	66.2°	30%	90.5° (2021)	55.9° (1967)
12	75.6°	66.2°	27%	91° (2021)	54° (2004)
13	75.7°	66.7°	33%	85.8° (1995)	54.9° (2017)
14	75.4°	66.4°	30%	87.1° (1988)	55.9° (2021)
15	75.9°	66.6°	22%	84.7° (2000)	55.2° (1979)
16	76.8°	67.1°	25%	92.3° (1988)	58.1° (1979)
17	75.9°	67.1°	37%	93.7° (1988)	57.6° (1963)
18	75.4°	66.4°	45%	82.4° (2008)	57.4° (1963)
19	74.8°	66.2°	47%	91.4° (1983)	56.1° (2004)
20	74.8°	66.4°	32%	84.7° (2023)	55.9° (2024)
21	75.4°	66.4°	37%	87.8° (2003)	52.2° (2024)
22	75.4°	66.2°	32%	87.6° (1968)	52° (2024)
23	75.2°	66°	37%	96.3° (2023)	56.7° (1966)
24	75.2°	66.4°	30%	93° (2020)	57° (1966)
25	75.6°	66.7°	27%	88.7° (2021)	52° (2025)
26	76.1°	66.9°	35%	92.3° (2020)	50.9° (2025)
27	76.1°	67.1°	42%	89.6° (2020)	52.9° (2025)
28	75.6°	66.4°	37%	90° (2021)	51.4° (1986)
29	75.6°	66°	35%	86.5° (2022)	52° (2025)
30	74.5°	65.7°	35%	84.4° (2013)	52.3° (2023)
31	73.8°	64.9°	17%	84° (2022)	52.3° (2025)