Latitude & Daylight at Porto

Porto sits at latitude 41.2°. At this latitude, daylight varies from approximately 15.0h in summer (solstice) to 15.0h in winter — a seasonal swing of 0.0h. The sun reaches a maximum altitude of 72.3° at summer solstice and a minimum of 25.4° at winter solstice. This mid-latitude profile is what shapes Porto's unique sunrise, sunset, and golden hour patterns year-round.

Porto lies within the southern half of the August 12, 2026 total solar eclipse path — totality will last approximately 1 minute 45 seconds over the city's iconic Dom Luís I Bridge and Douro River valley. The narrow streets of the UNESCO-listed Ribeira district will fall into an eerie midday darkness, as the Moon's shadow races inland from the Atlantic at over 2,000 km/h.

Golden Hour Photography at Porto

Golden hour at Porto occurs when the sun sits between −4° and 6° above the horizon, producing soft, warm, directional light ideal for portrait and landscape photography. At Porto's latitude, morning golden hour typically starts in the hour after sunrise and lasts approximately 28–40 minutes. Evening golden hour mirrors this before sunset. The longer twilight at this latitude gives photographers more time to capture the 'magic hour' compared to equatorial locations where the sun sets more steeply.

Porto at 41.2°N is bathed in Atlantic light — its famously golden late-afternoon sun, filtered through maritime haze, has inspired painters and photographers for centuries. The city's west-facing position at the mouth of the Douro River means every sunset is a spectacle framed by the river, the ocean, and the terraced hills of Vila Nova de Gaia across the water.

UV Exposure & Sun Safety at Porto

UV radiation at Porto peaks when the sun is highest in the sky — around solar noon. At 41.2° latitude, peak UV levels vary significantly by season: summer months see UV indices of 6–9 (high), while winter months typically register 1–3 (low). The World Health Organization recommends sun protection when UV index exceeds 3. At Porto's latitude, this threshold is exceeded for approximately 6–8 months per year, making sun awareness a year-round consideration for outdoor workers and athletes.

How We Calculate Solar Data for Porto

All solar calculations for Porto use the Jean Meeus Chapter 25 solar position algorithm with bisection iteration, accurate to ±1 minute for dates between 1901–2099. Sunrise and sunset times define the moment the upper limb of the sun appears on the horizon, accounting for atmospheric refraction. Daily data is calculated client-side from Porto's coordinates (41.2°, -8.6°) — zero server processing means your location data never leaves your device.