Blue Hour

Blue hour represents a brief but spectacular window of twilight when indirect sunlight creates a deep, saturated blue sky that transforms urban and landscape photography. Occurring twice daily—in the morning before sunrise and in the evening after sunset—blue hour happens when the sun sits between 4° and 8° below the horizon, typically lasting 20-40 minutes depending on latitude and season. During this period, the sky doesn't appear black but instead glows with rich, even blue tones ranging from deep navy to vibrant cerulean. This natural blue light provides the perfect complement to artificial lighting, making blue hour the ideal time for cityscape photography. Street lights, building illumination, and neon signs gain prominence while the sky retains detail and color, eliminating the harsh contrast between bright lights and pitch-black sky that plagues nighttime photography.

Architectural photographers also favor blue hour for exterior shots, as the balanced exposure allows both building details and sky features to be captured without bracketing. Landscape photographers use blue hour to create moody, atmospheric scenes with subtle color gradients and soft, directional shadows. The exact timing and quality of blue hour vary significantly with weather and atmospheric conditions—clear skies produce pure, saturated blues, while clouds can create dramatic purple and pink accents. At higher latitudes during summer, blue hour can blend seamlessly with golden hour, creating extended twilight periods.

PhotoWeather calculates precise blue hour timing based on your location's solar geometry and integrates current cloud cover, visibility, and atmospheric conditions to predict when this magical lighting will be at its best, helping you plan cityscape shoots, architectural photography, and twilight landscapes with confidence.