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