As of 22:46 CDT

Grafton, WI weather in May

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 May, Grafton, WI averages a high of 57° and a low of 47.2°. About 3.3 inches of precipitation fall over the month (11 wet days). The record high is 89.4° (2018) and the record low 27.9° (2020). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	52.2°	42.1°	42%	80.2° (2021)	30.6° (1978)
2	51.8°	42.6°	37%	81.1° (2021)	34° (1966)
3	51.3°	41.7°	35%	68.7° (2012)	33.8° (2023)
4	52.2°	41.9°	22%	72° (1980)	34.3° (2022)
5	53.6°	43.3°	27%	76.5° (2018)	35.1° (1968)
6	53.1°	43.3°	25%	71.8° (2025)	33.3° (1989)
7	52.3°	43.2°	32%	69.3° (2023)	32.5° (1989)
8	53.6°	44.2°	28%	78.4° (2018)	32.9° (2020)
9	54.5°	44.2°	35%	73.9° (2018)	27.9° (2020)
10	54°	44.6°	28%	74.1° (2022)	32.2° (1966)
11	55.6°	44.6°	43%	78.3° (2022)	33.3° (2020)
12	54.5°	44.8°	33%	75.4° (2022)	31.8° (2020)
13	54.9°	45.1°	37%	78.3° (2022)	36.3° (1996)
14	55.9°	46.2°	48%	78.3° (2022)	38.8° (1973)
15	57°	46.9°	43%	73.4° (2012)	36.3° (2016)
16	58.3°	47.1°	38%	82.8° (2025)	36.5° (2014)
17	56.8°	47.1°	35%	78.8° (2017)	38.3° (2002)
18	57.7°	47.8°	45%	72.3° (1998)	36.1° (2002)
19	58.5°	48.4°	40%	74.3° (1998)	38.8° (2025)
20	59°	48.9°	30%	77.5° (2022)	37° (2002)
21	58.5°	49.1°	27%	78.8° (2021)	36.9° (2002)
22	59.4°	49.6°	35%	82° (2021)	38.8° (1969)
23	59.5°	49.8°	40%	73.8° (2024)	37.8° (2025)
24	59.4°	50.4°	32%	77.2° (2020)	39.4° (2025)
25	60.3°	50°	40%	84.4° (2018)	39.7° (2025)
26	60.6°	51.1°	28%	82.2° (2018)	40.5° (1961)
27	60.8°	51.6°	38%	89.4° (2018)	40.8° (1971)
28	61.9°	52.5°	30%	84.2° (2018)	42.4° (2008)
29	62.2°	53.6°	37%	76.8° (1998)	41° (1965)
30	63.9°	53.6°	37%	79.5° (2022)	40.5° (2021)
31	64.2°	54°	43%	85.3° (2019)	42.6° (2015)