Seattle Forecasts High of 72°F on September 18
Seattle Forecasts High of 72°F on September 18
US · Published Sep 16, 2026
Seattle is expected to experience slightly above-average temperatures on September 18, 2026, with a forecasted high of 72°F (22°C).
Current observations indicate temperatures running 1-3°F above seasonal norms through September 16-17, supported by stable high-pressure conditions.

Impact & Risks

The forecasted conditions pose minimal risks, as temperatures remain within a comfortable range for outdoor activities. However, the lack of marine layer intrusion and persistent high pressure may lead to slightly warmer-than-usual afternoons. Residents and visitors should be aware of potential localized heat in urban areas, though no severe weather impacts are anticipated.

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