Cos Cob Harbor, CT Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Mon Aug 10 |
 |
Partly Cloudy Close Hourly |
88º / 72º | 22% | S 9 mph | 61% |
| 4am |  |
Mostly Clear | 70º | 2% | N 4 mph | 74% |
| 5am |  |
Partly Cloudy | 70º | 1% | N 4 mph | 74% |
| 6am | |
Partly Cloudy | 69º | 1% | N 3 mph | 74% |
| 7am | |
Partly Cloudy | 71º | 1% | NNE 2 mph | 74% |
| 8am | |
Partly Cloudy | 74º | 1% | NNE 3 mph | 68% |
| 9am | |
Partly Cloudy | 77º | 0% | NE 3 mph | 63% |
| 10am | |
Partly Cloudy | 79º | 0% | SE 3 mph | 59% |
| 11am | |
Partly Cloudy | 81º | 0% | S 4 mph | 57% |
| 12pm |  |
Mostly Cloudy | 83º | 0% | S 5 mph | 55% |
| 1pm | |
Mostly Cloudy | 85º | 0% | SSW 7 mph | 52% |
| 2pm | |
Partly Cloudy | 87º | 3% | SSW 7 mph | 50% |
| 3pm | |
Mostly Cloudy | 88º | 4% | SSW 8 mph | 50% |
| 4pm | |
Mostly Cloudy | 87º | 5% | SSW 9 mph | 52% |
| 5pm | |
Mostly Cloudy | 87º | 22% | SSW 9 mph | 52% |
| 6pm | |
Mostly Cloudy | 86º | 15% | SW 9 mph | 57% |
| 7pm | |
Mostly Cloudy | 83º | 20% | WSW 8 mph | 63% |
| 8pm |  |
Cloudy | 81º | 13% | WSW 7 mph | 72% |
| 9pm | |
Cloudy | 78º | 16% | WSW 5 mph | 77% |
| 10pm | |
Cloudy | 76º | 17% | WSW 5 mph | 82% |
| 11pm | |
Cloudy | 76º | 24% | WSW 7 mph | 82% |
|
Tue Aug 11 |
|
Partly Cloudy View Hourly |
89º / 70º | 15% | WNW 10 mph | 64% |
| 12am |  |
Mostly Cloudy | 76º | 22% | W 9 mph | 84% |
| 1am | |
Mostly Cloudy | 76º | 15% | W 7 mph | 84% |
| 2am | |
Mostly Cloudy | 75º | 6% | W 7 mph | 85% |
| 3am | |
Partly Cloudy | 74º | 6% | WNW 6 mph | 86% |
| 4am | |
Partly Cloudy | 73º | 6% | WNW 6 mph | 89% |
| 5am | |
Mostly Clear | 73º | 7% | WNW 6 mph | 90% |
| 6am | |
Mostly Clear | 73º | 7% | WNW 6 mph | 90% |
| 7am | |
Partly Cloudy | 73º | 7% | WNW 6 mph | 89% |
| 8am |  |
Mostly Sunny | 76º | 5% | WNW 7 mph | 82% |
| 9am | |
Partly Cloudy | 78º | 3% | NW 7 mph | 76% |
| 10am | |
Partly Cloudy | 80º | 2% | NW 7 mph | 71% |
| 11am | |
Partly Cloudy | 82º | 1% | WNW 7 mph | 65% |
| 12pm | |
Mostly Cloudy | 84º | 0% | WNW 8 mph | 61% |
| 1pm | |
Mostly Cloudy | 85º | 0% | WNW 8 mph | 57% |
| 2pm | |
Mostly Cloudy | 86º | 15% | WNW 9 mph | 53% |
| 3pm | |
Mostly Cloudy | 87º | 15% | WNW 10 mph | 51% |
| 4pm | |
Mostly Cloudy | 87º | 15% | WNW 10 mph | 52% |
| 5pm | |
Mostly Cloudy | 86º | 15% | NW 10 mph | 54% |
| 6pm | |
Cloudy | 85º | 15% | WNW 8 mph | 55% |
| 7pm | |
Mostly Cloudy | 83º | 15% | WNW 7 mph | 59% |
| 8pm | |
Partly Cloudy | 81º | 15% | WNW 5 mph | 66% |
| 9pm | |
Partly Cloudy | 78º | 15% | WNW 4 mph | 73% |
| 10pm | |
Mostly Cloudy | 76º | 15% | NW 4 mph | 77% |
| 11pm | |
Partly Cloudy | 75º | 7% | NW 4 mph | 78% |
|
Wed Aug 12 |
|
Partly Cloudy View Hourly |
85º / 69º | 5% | NW 7 mph | 56% |
| 12am | |
Partly Cloudy | 74º | 8% | NNW 4 mph | 81% |
| 1am | |
Mostly Cloudy | 74º | 9% | NNW 4 mph | 80% |
| 2am | |
Cloudy | 73º | 12% | NNW 4 mph | 79% |
| 3am | |
Cloudy | 73º | 11% | NNW 4 mph | 80% |
|
Thu Aug 13 |
|
Partly Cloudy | 87º / 69º | 20% | W 9 mph | 55% |
|
Fri Aug 14 |
|
Partly Cloudy | 85º / 64º | 16% | NNW 8 mph | 57% |
|
Sat Aug 15 |
|
Mostly Sunny | 82º / 66º | 4% | NNW 7 mph | 48% |
|
Sun Aug 16 |
 |
Showers | 80º / 69º | 55% | S 10 mph | 65% |
|
Mon Aug 17 |
 |
AM Showers | 82º / 67º | 45% | WNW 9 mph | 73% |
-
Buoy Data
For Cos Cob Harbor, CT -
Wind Forecast
In Cos Cob Harbor, CT -
Radar
In Cos Cob Harbor, CT -
Marine Forecast
In Cos Cob Harbor, CT
Weather Radar for Cos Cob Harbor, CT See Radar
* Playback displays weather for the past 6 hours.
NOAA Weather Marine Forecast for Cos Cob Harbor, CT
Variable winds less than 5 kt becoming S 5 to 7 kt in the afternoon. A chance of showers and thunderstorms after 5pm. Seas 1 ft or less.
SW wind around 7 kt becoming W after midnight. A chance of showers and thunderstorms before 11pm. Seas 1 ft or less.
WNW wind 7 to 9 kt. Mostly sunny. Seas 1 ft or less.
WNW wind 5 to 7 kt becoming variable and less than 5 kt after midnight. Partly cloudy. Seas 1 ft or less.
Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.
Variable winds 5 kt or less. A chance of showers after 2am. Seas 1 ft or less.
W wind 5 to 8 kt. A chance of showers before 8am. Seas 1 ft or less.
WNW wind 5 to 7 kt. Partly cloudy. Seas 1 ft or less.
NW wind 6 to 8 kt. Mostly sunny. Seas 1 ft or less.
NOAA Buoy Data Near Cos Cob Harbor, CT See Map
Featured Local Businesses
Wind Speed Forecast for Cos Cob Harbor, CT
| Monday | Tuesday | Wednesday | ||||||||||
| Wind Speed (MPH) | 4 | 3 | 5 | 9 | 7 | 9 | 6 | 7 | 8 | 10 | 5 | 4 |
| 8am | 12pm | 4pm | 8pm | 12am | 4am | 8am | 12pm | 4pm | 8pm | 12am | 4am | |
| MPH | 4 | 3 | 5 | 9 | 7 | 9 | 6 | 7 | 8 | 10 | 5 | 4 |
| DIR | N | NNE | S | SSW | WSW | W | WNW | WNW | WNW | WNW | WNW | NNW |
Current Weather Conditions In Cos Cob Harbor, CT
As Of: 18 minutes ago
- 70ºF
- 70ºF
- 4mph
- 0º (N)
- 4mph
- Mostly Clear
- 10mi
- 30.00"
- 74%
- 0ºF
The weather right now in Cos Cob Harbor, CT is Mostly Clear. The current temperature is 70°F, and the expected high and low for today, Monday, August 10, 2026, are 88° high temperature and 72°F low temperature. The wind is currently blowing at 4 miles per hour, and coming from the North. The wind is gusting to 4 mph. With the wind and the atmosphere the temperature feels like 70° Fahrenheit. Expected precipitation is 2 percent, with current humidity at 74 percent, and air pressure at 30 in. Visibility is 10 nautical miles. There are 1 current weather alert(s).
...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING...
WHAT: Heat index values up to 97.
WHERE: Southern Fairfield and Southern New Haven Counties.
WHEN: Until 7 PM EDT this evening.
IMPACTS: Hot temperatures and high humidity may cause heat
illnesses.
PRECAUTIONARY / PREPAREDNESS ACTIONS:
A Heat Advisory is issued when the combination of heat and humidity
is expected to make it feel like it is 95 to 99 degrees for two or
more consecutive days, or 100 to 104 degrees for any length of time.
Seniors and those with chronic health problems or mental health
conditions are at an increased risk. Homes without air conditioning
can be much hotter than outdoor temperatures.
Use air conditioning to stay cool at home or go to a place that has
air conditioning. If you don't have home air conditioning, continue
to seek out cool spaces each day as long as it remains hot, and for a
few days after if your home is still hot. Check on vulnerable
friends, family members and neighbors.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! In cases of heat stroke call 9 1 1.
&&
