San Francisco spring is the city at its most characteristically unpredictable. March sits at 12-16C with rain still a real factor: the rainy season technically ends in March but lingers. April is often the best month, with clearer skies and mild temperatures around 14-18C, though the fog can still roll in from the bay in the afternoon. May sees the beginning of the marine layer season: mornings often grey and cool, burning off to warm afternoons of 16-20C before cooling again in the evening. The city's famous micro-climate means the Mission District might be 5 degrees warmer than the Outer Sunset on the same afternoon. Plan your day by neighbourhood as well as by forecast.

The Layering Approach

San Francisco is the definitive layering city. Mark Twain's alleged quote about San Francisco being the coldest winter he ever spent being a summer is an exaggeration, but it captures something real about the city's relationship with warmth and expectation. The approach here: light, versatile layers that can be added and removed across the day as you move between neighbourhoods and microclimates. A base (light top or T-shirt), a mid-layer (a fleece or structured cardigan), and a windproof jacket covers virtually all spring conditions. The evening cold is consistent and often sharp: even a warm May afternoon transitions to a cool evening that catches visitors out.

City-Specific Essentials

Windproof jacket as your outer layer: The bay wind off the water is a constant factor, particularly at the Golden Gate, Alcatraz views, and the Embarcadero. A windproof shell that also handles light rain covers most SF spring weather.

Comfortable shoes for serious hills: San Francisco hills are not a tourist metaphor. The streets of Nob Hill, Russian Hill, Pacific Heights, and the Castro involve genuine gradients that punish inadequate footwear quickly. Cushioned shoes with a good sole grip are essential. New shoes are a very bad idea here.

Multiple light layers: Three lighter layers work better than one heavy layer in San Francisco, because you will be removing and adding as you move between neighbourhoods. A daypack for carrying what you peel off is part of the system.

Sunglasses: The spring sun when it appears is bright, and the bay reflection amplifies it. Quality sunglasses from March onwards.

Light sun cream for sunny days: Not the priority it is in southern cities, but worth having for long outdoor days when the marine layer clears and the sun is strong.

A smart-casual option for dinner: San Francisco has an exceptional restaurant scene. One good outfit for a proper dinner is worthwhile.

What to Leave Behind

Summer wardrobe as your primary kit: San Francisco spring is not beach weather. Light layers are the right approach, not shorts and T-shirts.

Sandals as primary footwear: The hills make them impractical for most sightseeing. Comfortable, supportive shoes cover the terrain properly.

Heavy coats: The windproof jacket and layering system handles all of San Francisco spring without a bulky coat.

Just one layer: The cardinal sin of San Francisco packing. Always have more layers than you think you need.

Planning Your Trip

San Francisco is a city that reveals itself through its neighbourhoods. Knowing which parts of the city to prioritise, how to use the transit system, and where to eat across different price points makes the trip significantly better. Our guide covers the practical decisions. Find it here: https://concisetravelguides.etsy.com/uk/listing/4472876305/san-francisco-guide-travel-itinerary

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