Custom Weather

• Your Weather Home
• Customize Options

Local Weather

• 48 Hour Weather Observations
• Extended Forecast
• Hourly Forecast Track
• Printable Forecast
• Special Weather Statements
• Warnings, Watches & Advisories

U.S. National

• 3 Hour Severe Weather Probability Forecast
• Current Weather Maps
• Fire Advisory
• Fire Detection
• Low Pressure Tracks
• National Summary & Forecast
• Radar
• Severe Weather Map
• Severe Weather Reports
• Snowfall Maps
• Special Storm Reports
• Tropical Storm Reports
• US Satellite Views
• Ultrviolet Index

Forecast for San Juan, Puerto Rico

Moon Phase: The phases of the Moon are related to (actually, caused by) the relative positions of the Moon and Sun in the sky. For example, New Moon occurs when the Sun and Moon are quite close together in the sky. Full Moon occurs when the Sun and Moon are at nearly opposite positions in the sky - which is why a Full Moon rises about the time of sunset, and sets about the time of sunrise, for most places on Earth.

Waxing Gibbous Moon: The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moons disk that is illuminated is increasing.

Twilight: Also known as "Dawn" preceding Sunrise and "Dusk" following Sunset. There are three kinds of twilight defined: civil twilight, nautical twilight, and astronomical twilight. For computational purposes, civil twilight begins before sunrise and ends after sunset when the geometric zenith distance of the center of the Sun is 96 degrees - 6 degrees below a horizontal plane. The corresponding solar zenith distances for nautical and astronomical twilight are 102 and 108 degrees, respectively. That is, at the dark limit of nautical twilight, the center of the Sun is geometrically 12 degrees below a horizontal plane; and at the dark limit of astronomical twilight, the center of the Sun is geometrically 18 degrees below a horizontal plane.

Sunrise and sunset: For computational purposes, sunrise or sunset is defined to occur when the geometric zenith distance of center of the Sun is 90.8333 degrees. That is, the center of the Sun is geometrically 50 arcminutes below a horizontal plane. For an observer at sea level with a level, unobstructed horizon, under average atmospheric conditions, the upper limb of the Sun will then appear to be tangent to the horizon. The 50-arcminute geometric depression of the Sun's center used for the computations is obtained by adding the average apparent radius of the Sun (16 arcminutes) to the average amount of atmospheric refraction at the horizon (34 arcminutes).

Accuracy of rise/set computations: The times of rise and set phenomena cannot be precisely computed, because, in practice, the actual times depend on unpredictable atmospheric conditions that affect the amount of refraction at the horizon. Thus, even under ideal conditions (e.g., a clear sky at sea) the times computed for rise or set may be in error by a minute or more. Local topography (e.g., mountains on the horizon) and the height of the observer can affect the times of rise or set even more. It is not practical to attempt to include such effects in routine rise/set computations.

Limitation of Liability -- TheWeatherGuys.com does not warrant the accuracy, completeness, merchantability or fitness for a particular purpose of any of the weather information data in any of the products offered through this service. Under no circumstances and under no legal theory, tort, contract, or otherwise, shall TheWeatherGuys.com, its parent company, individual contributors, system operators, developers, or sponsors of TheWeatherGuys.com nor anyone else connected to TheWeatherGuys.com be liable to you or any other person for any indirect, special, incidental, or consequential damages of any character, including without limitation, damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all commercial and monetary damages. This limitation of liability shall not apply to liability for death or personal injury to the extent applicable law prohibits such limitation. None of the weather information contained on the site may be reproduced, sold, transferred, or modified without the express written permission of WYME, Inc. By using TheWeatherGuys.com you agree to all terms and conditions. US Forecasts are Public Domain and derived from the National Weather Service - (IWIN) and the National Oceanic Atmospheric Administration (NOAA). Canadian forecasts are obtained from and are copyright of Environment Canada. TheWeatherGuys.com translates the raw text into a web interface for ease of use.