September Daily Averages for Washington
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| Day | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 25 | 25 | 25 | 26 | 24 | 23 | 23 | 24 | 24 | 24 | 23 | 22 | 23 | 23 | 22 | 21 | 21 | 21 | 21 | 21 | 22 | 23 | 22 | 22 | 20 | 20 | 22 | 21 | 18 | 19 |
| °F | 77 | 77 | 77 | 79 | 75 | 73 | 73 | 75 | 75 | 75 | 73 | 72 | 73 | 73 | 72 | 70 | 70 | 70 | 70 | 70 | 72 | 73 | 72 | 72 | 68 | 68 | 72 | 70 | 64 | 66 |