Average data for 10 years
1 September
Sunday
+24°
+17°
2 September
Monday
+24°
+18°
3 September
Tuesday
+24°
+18°
4 September
Wednesday
+24°
+17°
5 September
Thursday
+24°
+18°
6 September
Friday
+24°
+18°
7 September
Saturday
+25°
+19°
8 September
Sunday
+25°
+17°
9 September
Monday
+26°
+18°
10 September
Tuesday
+29°
+19°
11 September
Wednesday
+26°
+17°
12 September
Thursday
+24°
+16°
13 September
Friday
+24°
+18°
14 September
Saturday
+24°
+18°
15 September
Sunday
+23°
+17°
16 September
Monday
+21°
+17°
17 September
Tuesday
+22°
+17°
18 September
Wednesday
+22°
+16°
19 September
Thursday
+21°
+17°
20 September
Friday
+21°
+15°
21 September
Saturday
+21°
+16°
22 September
Sunday
+20°
+15°
23 September
Monday
+20°
+16°
24 September
Tuesday
+20°
+16°
25 September
Wednesday
+21°
+15°
26 September
Thursday
+23°
+16°
27 September
Friday
+23°
+16°
28 September
Saturday
+21°
+15°
29 September
Sunday
+20°
+15°
30 September
Monday
+19°
+14°
Cities near you
United States
Seattle
Canada
Vancouver
United States
Portland
Canada
Victoria
United States
Aberdeen
Cities with similar weather in September
Hungary
Budapest
Kyrgyzstan
Bishkek
Italy
Genoa
Moldova
Cahul
Croatia
Zagreb
In September, the weather in Lake Oswego is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Lake Oswego has 17 sunny, 9 partly cloudy, and 4 rainy days in September. The rains are usually light.