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San Francisco summers are heating up<\/strong><\/p>\n San Francisco<\/strong>, once renowned for its foggy, sweater-worthy summers<\/strong>, is now shifting toward a hotter and drier pattern<\/strong>, reshaping its identity as a cool coastal city<\/strong>. Since 1970<\/strong>, the average summer temperature in downtown San Francisco<\/strong> has risen by 2 \u00b0F (1.1 \u00b0C)<\/strong>, while at San Francisco International Airport<\/strong>, the increase is more striking\u20144 \u00b0F (2.2 \u00b0C)<\/strong>. According to Daniel McEvoy<\/strong> of the National Weather Service<\/strong>, the change is undeniable and ongoing<\/strong>.<\/p>\n <\/p>\n Why this subtle warming matters<\/strong><\/p>\n Even small increases<\/strong> in temperature are significant<\/strong>. Eugene Cordero<\/strong>, professor at San Jose State University<\/strong>, explained that a 2 \u00b0F rise (1.1 \u00b0C)<\/strong> can lead to unseasonably warm days<\/strong> and uncomfortable nights<\/strong>, potentially pushing residents to use air conditioning<\/strong>\u2014an amenity many San Franciscans don\u2019t have<\/strong>.<\/p>\n A heat vulnerability study<\/strong> conducted by the city highlights that the lack of cooling systems, paired with buildings designed for cool climates<\/strong>, can place pressure on emergency services<\/strong>. The historic 106 \u00b0F (41.1 \u00b0C)<\/strong> event on September 1, 2017<\/strong>, led to more than double the normal volume of 911 calls<\/strong>.<\/p>\n <\/p>\n Where heat strikes hardest<\/strong><\/p>\n The rise in urban temperatures<\/strong> is not evenly distributed. Neighborhoods such as the Tenderloin<\/strong>, South of Market<\/strong>, Chinatown<\/strong>, Union Square<\/strong>, parts of the Mission<\/strong> and Portola<\/strong> districts experience intensified heat due to their urban infrastructure<\/strong>. These urban heat islands<\/strong> retain and radiate warmth, distorting local wind flow<\/strong> and increasing thermal stress<\/strong>.<\/p>\n According to Climate Central<\/strong>, the number of above-average heat days<\/strong> in San Francisco<\/strong> has increased by 28 days<\/strong> since 1970\u2014further evidence of longer, more persistent heat spells<\/strong>.<\/p>\n <\/p>\n Fog fades as oceans warm<\/strong><\/p>\n The city\u2019s signature summer fog<\/strong>, which cools the region and defines its microclimates<\/strong>, is also in retreat. Todd Dawson<\/strong> of UC Berkeley<\/strong> revealed that since the 1950s<\/strong>, San Francisco<\/strong> has lost around three hours of fog daily<\/strong>. This reduction is due to warmer land surfaces<\/strong> and coastal waters<\/strong>, which accelerate fog evaporation<\/strong>.<\/p>\n The result is increasingly sun-drenched areas<\/strong>, particularly in neighborhoods like North Beach<\/strong>, while typically foggy spots like the Outer Sunset<\/strong> still hold onto some chill. However, the intensity and presence of fog<\/strong>\u2014a major driver of San Francisco\u2019s block-by-block climate variance<\/strong>\u2014is undoubtedly weakening<\/strong>.<\/p>\n <\/p>\n Relief from the sea<\/strong><\/p>\n Despite warming trends, San Francisco<\/strong> continues to benefit from its marine influence<\/strong>. Afternoon breezes<\/strong>, driven by heat differentials<\/strong> between interior California<\/strong> and the ocean<\/strong>, still offer natural cooling<\/strong>, especially in coastal neighborhoods<\/strong>. This pattern, described as a \u201csummertime phenomenon\u201d<\/strong> by Stanford climatologist Chris Field<\/strong>, creates dramatic contrasts across the Bay Area<\/strong>, where temperature variations<\/strong> can rival those across entire states<\/strong>.<\/p>\n Jan Null<\/strong>, a veteran meteorologist, emphasized that while heat spikes<\/strong> are becoming more common, temperatures still stabilize<\/strong>, offering occasional breaks<\/strong> from the warming trend.<\/p>\n <\/p>\n Looking toward the 2025 summer<\/strong><\/p>\n Experts agree: San Francisco<\/strong> is very likely<\/strong> to see a hotter-than-average summer<\/strong> in 2025. The National Oceanic and Atmospheric Administration<\/strong> forecasts above-normal temperatures<\/strong> for Northern California<\/strong>, including San Francisco<\/strong>. As heat events increase<\/strong>, the health implications grow. Aritree Samanta<\/strong>, environmental science professor at San Francisco State University<\/strong>, warns that even moderate heat<\/strong> can become dangerous<\/strong>, as the city\u2019s residents and infrastructure are unprepared<\/strong>.<\/p>\n Officials urge awareness<\/strong> of \u201csilent killers<\/strong>\u201d like extreme heat<\/strong>, advocating for greater investment<\/strong> in weather services<\/strong> and climate forecasting<\/strong>. Eugene Cordero<\/strong> believes the rising heat<\/strong> underscores the need for national preparedness<\/strong>, better forecasting tools<\/strong>, and scientific support<\/strong> for tracking a rapidly changing climate<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":" San Francisco summers are heating up San Francisco, once renowned for its foggy, sweater-worthy summers, is now shifting toward a hotter and drier pattern, reshaping its identity as a cool coastal city. Since 1970, the average summer temperature in downtown San Francisco has risen by 2 \u00b0F (1.1 \u00b0C), while at San Francisco International Airport, […]<\/p>\n","protected":false},"author":17,"featured_media":3654,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3653","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news"],"yoast_head":"\n