Weather in Сан-Франциско by month: what to expect

Сан-Франциско enjoys a mild maritime climate with little variation in temperature throughout the year. Unlike many other U.S. cities, Сан-Франциско rarely experiences extreme heat or cold, making it a comfortable destination in any season. The city’s weather is shaped by the Pacific Ocean, which keeps summers cool and winters mild but damp.

The most distinct feature of Сан-Франциско’s weather is its seasonal contrast in precipitation. From November to March, the city sees frequent rain, while May through September are almost entirely dry. This pattern makes Сан-Франциско ideal for outdoor activities in the summer and early fall, though visitors in winter should be prepared for wet conditions.

Temperatures in Сан-Франциско remain moderate year-round, with average highs ranging from 14 °C in January to 23.2 °C in September. Even in the warmest months, the city rarely feels hot, thanks to the cooling influence of ocean breezes. Nights can be chilly, with lows dipping to 7.7 °C in January and staying around 14 °C even in August.

The most stable temperatures occur from June to October, when daytime highs hover between 18 °C and 23 °C. April, May, and November offer pleasant transitional weather, with highs around 15–20 °C. While Сан-Франциско’s winters are mild compared to much of the U.S., the combination of 10–14 °C temperatures and rain can feel cooler than the numbers suggest.

Сан-Франциско’s rainy season runs from November to March, with January and December being the wettest months, averaging 104.9 mm and 86.7 mm of rain, respectively. Showers are frequent but rarely heavy, and sunny breaks are common even in winter. By contrast, July and August are almost completely dry, with just 0.2 mm and 0.8 mm of precipitation on average.

The transition months—April and October—mark the shift between wet and dry seasons. April sees a sharp drop in rainfall to 26 mm, while October brings the first significant rains after the summer drought, averaging 27.1 mm. If you’re visiting Сан-Франциско in the dry season, you can leave the umbrella behind, but from November onward, it’s wise to pack one.

For a trip to Сан-Франциско in summer or early fall, layers are key. Days may start with fog and cool breezes, warming up to 18–23 °C by afternoon. A light jacket or sweater is essential, even in July or August, when evenings can feel surprisingly brisk. Comfortable walking shoes are a must, as the city’s hills and uneven sidewalks demand practical footwear.

Winter visitors to Сан-Франциско should pack for rain and mild temperatures. A waterproof jacket and sturdy shoes will help navigate the wet conditions from December to February, when temperatures hover around 10–14 °C. While snow is unheard of, the damp air can make it feel colder, so a scarf and gloves may come in handy for sensitive travelers.

Spring and fall in Сан-Франциско call for versatile clothing. April and May bring mild days with highs around 15–20 °C, while October and November see temperatures drop slightly. A mix of short- and long-sleeve shirts, along with a light jacket, will cover most conditions. If you plan to visit the beach, a windbreaker is useful, as coastal breezes can be strong year-round.