Our Proprietary 10-Day Forecast

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Current warnings over Old Greenwich, Connecticut
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Old Greenwich, Connecticut red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Old Greenwich, Connecticut red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Fairfield County, CT

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Old Greenwich, Connecticut

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Old Greenwich, CT please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Old Greenwich, CT

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Old Greenwich, CT, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Old Greenwich, Connecticut

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Fairfield County, Connecticut

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
Old Greenwich, Connecticut has a humid continental climate (Köppen Dfa), with hot, humid summers and cold, snowy winters. The average annual temperature is 52.3 °F (11.3 °C), with an average annual precipitation of 47.2 inches (1,199 mm).

Summer

Summer in Old Greenwich is hot and humid, with average high temperatures in the upper 80s °F (low 30s °C) and average low temperatures in the mid 60s °F (low 20s °C). The hottest month is July, with an average high temperature of 87 °F (31 °C) and an average low temperature of 68 °F (20 °C). Heat waves are common in the summer, with temperatures sometimes reaching into the 90s °F (mid 30s °C).

Winter

Winter in Old Greenwich is cold and snowy, with average high temperatures in the mid 30s °F (low 2s °C) and average low temperatures in the low 20s °F (around -6 °C). The coldest month is January, with an average high temperature of 35 °F (2 °C) and an average low temperature of 19 °F (-7 °C). Snowfall is common in the winter, with an average of 26.3 inches (67 cm) per year.

Spring and Fall

Spring and fall in Old Greenwich are mild and pleasant, with average high temperatures in the 50s and 60s °F (10s and low 20s °C) and average low temperatures in the 30s and 40s °F (low 0s and low 10s °C).

Precipitation

Old Greenwich receives an average of 47.2 inches (1,199 mm) of precipitation per year, which is spread fairly evenly throughout the year. The wettest month is March, with an average of 4.3 inches (110 mm) of precipitation, and the driest month is February, with an average of 2.7 inches (69 mm) of precipitation.

Climate Change

The climate of Old Greenwich is changing, as it is in the rest of the world. The average annual temperature has increased by about 2 °F (1 °C) since the late 19th century, and the number of days with extreme heat has increased. The average annual precipitation has also increased, and the number of days with heavy precipitation has increased. These changes are expected to continue in the future, and they are likely to have a significant impact on the environment and the people of Old Greenwich.

Facts & Historical Information
(made with AI, use with caution)
Nestled along the Long Island Sound, Old Greenwich, CT boasts a rich natural history and scientific legacy. In 1640, the area was acquired by the Dutch West India Company, who recognized its strategic location for trade and exploration.

In the 19th century, Old Greenwich became a hub for scientific research. The Bruce Museum, founded in 1912, houses a renowned collection of natural history specimens, including fossils, minerals, and marine life. The museum's founder, Robert Bruce, was an avid naturalist and explorer who collected many of the specimens himself.

Another notable figure from Old Greenwich's scientific history is Dr. William Beebe, a renowned oceanographer and explorer. In the 1930s, Beebe conducted groundbreaking deep-sea dives in the Bathysphere, a spherical submersible vessel. His research revolutionized the understanding of marine life at extreme depths.

Today, Old Greenwich remains a vibrant center for science and nature. The Greenwich Audubon Center offers educational programs and nature trails, while the Greenwich Land Trust preserves over 1,000 acres of open space, including coastal habitats and forests. The town's rich history and ongoing commitment to science and conservation make it a unique and fascinating place to explore.

Tourist Attractions
1. Bruce Museum of Arts and Science: This museum features a diverse collection of art and science exhibits, including American and European paintings, sculptures, minerals, and wildlife dioramas.

2. Greenwich Point Park: This scenic waterfront park offers stunning views of Long Island Sound, as well as opportunities for picnicking, fishing, and kayaking.

3. Audubon Greenwich: This nature center and sanctuary provides a tranquil retreat with hiking trails, a butterfly garden, and a variety of educational programs.

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