As of 19:52 EDT

Stony Brook University, NY weather in September

81°

Stony Brook University, Sunday, 9 August, 19:52

Clear. Feels like 85°. High 89°, low 72°.

Pressure29.94 inHg

Wind15 mph NW

Humidity71%

Visibility6.2 mi

Dew point71°

See detailed hourly forecast

In September, Stony Brook University, NY averages a high of 72.3° and a low of 62°. About 3.9 inches of precipitation fall over the month (9 wet days). The record high is 94.8° (2023) and the record low 45.9° (2000). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	76.3°	65.8°	27%	90.9° (2010)	54.9° (2017)
2	75.9°	65.1°	28%	89.4° (1966)	56.1° (2017)
3	76.3°	65.3°	32%	89.6° (2023)	53.1° (2025)
4	76.6°	65.7°	22%	91.6° (2023)	54.7° (1997)
5	75.7°	65.1°	20%	93.7° (2023)	55° (2000)
6	75.2°	64.9°	33%	93.7° (2023)	54.9° (1984)
7	75.4°	64.6°	33%	94.8° (2023)	54.9° (1984)
8	74.7°	64.2°	27%	87.6° (2015)	55.2° (2024)
9	74.3°	63.7°	25%	86.5° (2016)	54.9° (2025)
10	74.3°	63.7°	27%	89.1° (1983)	54° (1978)
11	74.3°	63.3°	25%	91.4° (1983)	52.3° (1967)
12	73.8°	62.8°	22%	88° (2005)	52.5° (1967)
13	73.9°	63.1°	30%	86.5° (2005)	50.5° (1963)
14	73.9°	63.3°	33%	83.7° (2024)	51.3° (1975)
15	72.1°	61.9°	33%	80.4° (2021)	52.7° (1975)
16	71.4°	61.3°	27%	84.4° (1991)	50.4° (1984)
17	71.6°	61.3°	30%	85.5° (1991)	49.5° (1986)
18	71.6°	61.9°	23%	82.9° (1965)	49.8° (1990)
19	71.6°	60.6°	30%	85.5° (1983)	51.1° (2020)
20	70.7°	60.6°	27%	82.9° (1983)	49.8° (1979)
21	70.9°	60.8°	27%	81.3° (2019)	47.3° (1962)
22	70.9°	60.4°	38%	85.3° (1980)	50.2° (2020)
23	70.2°	59.7°	38%	87.3° (1970)	46.6° (1963)
24	68.5°	58.6°	32%	87.8° (2017)	46.2° (1963)
25	68.7°	59°	23%	84.2° (2017)	48.6° (1967)
26	69.3°	59.7°	40%	81.3° (1970)	50.9° (1978)
27	70°	59.5°	28%	82.4° (2017)	48° (1989)
28	69.1°	59.5°	40%	79.3° (2025)	48.4° (1989)
29	66.9°	58.3°	35%	76.1° (2019)	45.9° (2000)
30	66°	57°	33%	79.5° (1986)	46.8° (1991)