San Francisco Forecasts Upper 50s for August 28 Due to Marine Layer
San Francisco Forecasts Upper 50s for August 28 Due to Marine Layer
US · Published Aug 28, 2026
• The National Weather Service (NWS) predicts that San Francisco will experience a low temperature in the upper 50s °F (approximately 13-15 °C) on August 28,
• This forecast is influenced by a strengthening marine layer and onshore westerly winds, which are expected to limit overnight cooling. Persistent stratus clouds and fog, locally known as 'Karl the Fog,' will contribute to the stable temperature range. Dew points are forecasted to hover around 55-56 °F (12.8-13.3 °C), with sustained winds of 10-15 mph. These conditions align with the city's climatological average low of 56 °F (13.3 °C) for August. While the forecast is narrowing, minor uncertainties remain due to variations in fog timing, wind gusts, and localized temperature differences.

Impact & Risks

The forecasted conditions are typical for San Francisco in late August and are not expected to pose significant risks. However, the persistent fog and cooler temperatures may impact visibility and outdoor activities, particularly during the early morning hours. Travelers and residents should be prepared for damp and breezy conditions, especially near the coast and in areas exposed to the onshore flow.

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