Cos Cob Harbor, CT Weather Forecast and Current Conditions
| Day | Sky | High / Low | Precip | Wind | Humidity | |
|---|---|---|---|---|---|---|
|
Mon Jul 20 |
 |
Cloudy | -º / 65º | 2% | S 7 mph | 89% |
|
Tue Jul 21 |
 |
Heavy Thunderstorms View Hourly |
77º / 71º | 76% | SSE 14 mph | 88% |
| 2am |  |
Partly Cloudy | 67º | 2% | S 3 mph | 90% |
| 3am |  |
Mostly Cloudy | 68º | 2% | S 5 mph | 88% |
| 4am | |
Cloudy | 68º | 2% | S 4 mph | 89% |
| 5am | |
Cloudy | 71º | 2% | S 7 mph | 85% |
| 6am | |
Cloudy | 71º | 2% | SSE 7 mph | 86% |
| 7am |  |
Mostly Cloudy | 72º | 3% | SSE 8 mph | 85% |
| 8am | |
Cloudy | 74º | 11% | SSE 9 mph | 81% |
| 9am | |
Cloudy | 75º | 21% | SSE 13 mph | 77% |
| 10am | |
Cloudy | 76º | 24% | SSE 12 mph | 76% |
| 11am |  |
Scattered Thunderstorms | 77º | 55% | SSE 14 mph | 77% |
| 12pm | |
Scattered Thunderstorms | 76º | 46% | SSE 14 mph | 86% |
| 1pm | |
Thunderstorms | 75º | 75% | SSE 12 mph | 91% |
| 2pm | |
Thunderstorms | 75º | 68% | SSE 12 mph | 96% |
| 3pm | |
Heavy Thunderstorms | 75º | 65% | SSE 11 mph | 97% |
| 4pm | |
Thunderstorms | 75º | 76% | SSE 11 mph | 98% |
| 5pm | |
Scattered Thunderstorms | 75º | 57% | SSE 10 mph | 98% |
| 6pm | |
Scattered Thunderstorms | 75º | 56% | S 8 mph | 95% |
| 7pm | |
Thunderstorms | 75º | 88% | S 9 mph | 91% |
| 8pm | |
Heavy Thunderstorms | 74º | 78% | SSW 10 mph | 95% |
| 9pm | |
Thunderstorms | 72º | 80% | SSW 13 mph | 95% |
| 10pm | |
Cloudy | 72º | 24% | SSW 9 mph | 93% |
| 11pm | |
Mostly Cloudy | 73º | 24% | SSW 8 mph | 95% |
|
Wed Jul 22 |
 |
Partly Cloudy View Hourly |
83º / 61º | 21% | WSW 12 mph | 71% |
| 12am |  |
Scattered Thunderstorms | 72º | 39% | SSW 8 mph | 98% |
| 1am | |
Isolated Thunderstorms | 73º | 34% | SW 9 mph | 97% |
| 2am | |
Scattered Thunderstorms | 72º | 44% | SW 9 mph | 98% |
| 3am | |
Scattered Thunderstorms | 73º | 39% | SW 11 mph | 94% |
| 4am | |
Isolated Thunderstorms | 72º | 34% | SW 8 mph | 95% |
| 5am | |
Cloudy | 72º | 15% | SW 8 mph | 94% |
| 6am |  |
Isolated Thunderstorms | 72º | 33% | SW 8 mph | 95% |
| 7am | |
Mostly Cloudy | 72º | 21% | SW 10 mph | 94% |
| 8am | |
Mostly Cloudy | 74º | 12% | WSW 9 mph | 90% |
| 9am | |
Mostly Cloudy | 75º | 20% | WSW 10 mph | 85% |
| 10am | |
Partly Cloudy | 77º | 8% | WSW 9 mph | 80% |
| 11am | |
Partly Cloudy | 79º | 10% | WSW 10 mph | 73% |
| 12pm | |
Mostly Cloudy | 80º | 13% | WSW 10 mph | 70% |
| 1pm | |
Mostly Cloudy | 81º | 9% | WSW 11 mph | 67% |
| 2pm | |
Partly Cloudy | 82º | 19% | W 11 mph | 62% |
| 3pm | |
Partly Cloudy | 81º | 4% | WSW 11 mph | 62% |
| 4pm | |
Partly Cloudy | 82º | 3% | WSW 11 mph | 59% |
| 5pm |  |
Mostly Sunny | 82º | 1% | W 11 mph | 55% |
| 6pm | |
Mostly Sunny | 81º | 0% | W 9 mph | 54% |
| 7pm | |
Mostly Sunny | 80º | 1% | WNW 9 mph | 53% |
| 8pm |  |
Sunny | 78º | 1% | WNW 9 mph | 55% |
| 9pm |  |
Clear | 74º | 3% | NW 8 mph | 60% |
| 10pm | |
Clear | 72º | 3% | NW 7 mph | 62% |
| 11pm | |
Clear | 71º | 1% | NNW 7 mph | 64% |
|
Thu Jul 23 |
|
Sunny View Hourly |
79º / 62º | 3% | N 9 mph | 53% |
| 12am | |
Clear | 69º | 2% | NNW 6 mph | 67% |
| 1am |  |
Mostly Clear | 68º | 2% | NNW 7 mph | 69% |
|
Fri Jul 24 |
|
Mostly Sunny | 81º / 63º | 3% | ENE 7 mph | 53% |
|
Sat Jul 25 |
|
Partly Cloudy | 78º / 64º | 14% | ENE 10 mph | 58% |
|
Sun Jul 26 |
|
Partly Cloudy | 81º / 68º | 24% | N 8 mph | 61% |
|
Mon Jul 27 |
|
PM Thunderstorms | 79º / 67º | 46% | SW 10 mph | 71% |
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Wind Forecast
In Cos Cob Harbor, CT -
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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
Tuesday
High : 79ºF
SSE wind 6 to 9 kt increasing to 10 to 13 kt in the afternoon. Winds could gust as high as 20 kt. Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Seas 1 ft or less.
SSE wind 6 to 9 kt increasing to 10 to 13 kt in the afternoon. Winds could gust as high as 20 kt. Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Seas 1 ft or less.
Tuesday Night
Low : 70ºF
SSW wind around 11 kt. Showers and possibly a thunderstorm, mainly before 2am, then a chance of showers and thunderstorms after 2am. Seas around 1 ft.
SSW wind around 11 kt. Showers and possibly a thunderstorm, mainly before 2am, then a chance of showers and thunderstorms after 2am. Seas around 1 ft.
Wednesday
High : 82ºF
SW wind around 10 kt. A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Seas around 1 ft.
SW wind around 10 kt. A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Seas around 1 ft.
Wednesday Night
Low : 64ºF
W wind around 8 kt becoming NNW after midnight. Showers likely and possibly a thunderstorm before 8pm. Seas 1 ft or less.
W wind around 8 kt becoming NNW after midnight. Showers likely and possibly a thunderstorm before 8pm. Seas 1 ft or less.
Thursday
High : 79ºF
NNW wind around 7 kt. Sunny. Seas 1 ft or less.
NNW wind around 7 kt. Sunny. Seas 1 ft or less.
Thursday Night
Low : 62ºF
Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.
Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.
Friday
High : 79ºF
Variable winds 5 kt or less. Sunny. Seas 1 ft or less.
Variable winds 5 kt or less. Sunny. Seas 1 ft or less.
Friday Night
Low : 64ºF
Variable winds 5 kt or less. Partly cloudy. Seas 1 ft or less.
Variable winds 5 kt or less. Partly cloudy. Seas 1 ft or less.
Saturday
High : 81ºF
Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.
Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.
NOAA Buoy Data Near Cos Cob Harbor, CT See Map
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Wind Speed Forecast for Cos Cob Harbor, CT
| Tuesday | Wednesday | Thursday | ||||||||||
| Wind Speed (MPH) | 3 | 7 | 12 | 12 | 8 | 9 | 9 | 8 | 9 | 11 | 9 | 7 |
| 6am | 10am | 2pm | 6pm | 10pm | 2am | 6am | 10am | 2pm | 6pm | 10pm | 2am | |
| MPH | 3 | 7 | 12 | 12 | 8 | 9 | 9 | 8 | 9 | 11 | 9 | 7 |
| DIR | S | SSE | SSE | SSE | S | SSW | SW | SW | WSW | W | W | NW |
Current Weather Conditions In Cos Cob Harbor, CT
As Of: 31 minutes ago
- 67ºF
- 67ºF
- 3mph
- 0º (S)
- 3mph
- Partly Cloudy
- 10mi
- 29.95"
- 90%
- 0ºF
The weather right now in Cos Cob Harbor, CT is Partly Cloudy. The current temperature is 67°F, and the expected high and low for today, Tuesday, July 21, 2026, are -° high temperature and 65°F low temperature. The wind is currently blowing at 3 miles per hour, and coming from the South. The wind is gusting to 3 mph. With the wind and the atmosphere the temperature feels like 67° Fahrenheit. Expected precipitation is 2 percent, with current humidity at 90 percent, and air pressure at 29.95 in. Visibility is 10 nautical miles. There are no current weather alert(s).
