Over the last 365 complete days, the highest daily maximum at Seattle was 34°C on Jul 22 2026 and the lowest was 2°C on Mar 13 2026. The observed high is the highest temperature in the airport's own METAR reports during the local calendar day. Updated twice a day.
The first check appears after the first archived day ends.
Scorecard appears after 7 checked days (0/7 so far).
| Month | Average high | Warmest day | Coolest day | Days |
|---|---|---|---|---|
| Oct 2026 | 16.8° | 24° | 12° | 29 |
| Sep 2026 | 19.8° | 25° | 16° | 30 |
| Aug 2026 | 25.5° | 31° | 21° | 31 |
| Jul 2026 | 24.5° | 34° | 17° | 31 |
| Jun 2026 | 22.7° | 32° | 16° | 30 |
| May 2026 | 19.2° | 27° | 10° | 31 |
| Apr 2026 | 15.5° | 23° | 8° | 30 |
| Mar 2026 | 10.8° | 14° | 2° | 31 |
| Feb 2026 | 10.0° | 16° | 5° | 28 |
| Jan 2026 | 9.3° | 14° | 4° | 31 |
| Dec 2025 | 9.4° | 14° | 4° | 31 |
| Nov 2025 | 11.7° | 17° | 7° | 30 |
| Oct 2025 | 12.0° | 13° | 11° | 2 |