Average data for 10 years
1 September
Sunday
+24°
+23°
2 September
Monday
+24°
+22°
3 September
Tuesday
+23°
+22°
4 September
Wednesday
+24°
+22°
5 September
Thursday
+22°
+22°
6 September
Friday
+22°
+21°
7 September
Saturday
+24°
+22°
8 September
Sunday
+22°
+21°
9 September
Monday
+23°
+21°
10 September
Tuesday
+22°
+20°
11 September
Wednesday
+22°
+20°
12 September
Thursday
+22°
+20°
13 September
Friday
+22°
+20°
14 September
Saturday
+22°
+20°
15 September
Sunday
+21°
+20°
16 September
Monday
+20°
+18°
17 September
Tuesday
+21°
+18°
18 September
Wednesday
+21°
+19°
19 September
Thursday
+20°
+19°
20 September
Friday
+21°
+19°
21 September
Saturday
+21°
+20°
22 September
Sunday
+21°
+19°
23 September
Monday
+22°
+19°
24 September
Tuesday
+20°
+19°
25 September
Wednesday
+19°
+18°
26 September
Thursday
+21°
+18°
27 September
Friday
+22°
+20°
28 September
Saturday
+20°
+20°
29 September
Sunday
+19°
+19°
30 September
Monday
+18°
+17°
In September, the weather in Holtsville is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Holtsville has 15 sunny, 9 rainy, and 6 partly cloudy days in September. The rains are usually moderate.