Best Time to See Dolphins in Connecticut
September, April and May is the best time to see dolphins in Connecticut. Based on 6 verified iNaturalist observations, here is exactly when dolphins are most active across the year in Connecticut.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
6 verified observations of dolphins in Connecticut, recorded across 5 months of the year on iNaturalist.
When dolphins are recorded in Connecticut
Peak month
September
2 records (33.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| Aprilpeak | 1 | 16.7% |
| Maypeak | 1 | 16.7% |
| June | 0 | 0% |
| July | 0 | 0% |
| August | 1 | 16.7% |
| Septemberpeak | 2 | 33.3% |
| October | 1 | 16.7% |
| November | 0 | 0% |
| December | 0 | 0% |
Dolphins you are most likely to see
| Species | Verified observations |
|---|---|
| Tamanend's Bottlenose Dolphin | 3 |
| Common Bottlenose Dolphin | 1 |
| Atlantic White-sided Dolphin | 1 |
Weather to expect, source Open-Meteo
Typical weather in Connecticut
Recent typical conditions by month, so you can plan a trip around both when dolphins are active and what the weather is doing. The best months to look for dolphins sit around 39 to 74 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 39°F | 24°F | 4.2" |
| Feb | 41°F | 24°F | 3.6" |
| Mar | 49°F | 30°F | 4.2" |
| Aprbest time | 58°F | 39°F | 5.5" |
| Maybest time | 68°F | 48°F | 4" |
| Jun | 78°F | 59°F | 3.6" |
| Jul | 84°F | 66°F | 5.2" |
| Aug | 82°F | 65°F | 4.1" |
| Sepbest time | 74°F | 58°F | 5.9" |
| Oct | 64°F | 48°F | 5.6" |
| Nov | 51°F | 35°F | 3.1" |
| Dec | 43°F | 29°F | 5.9" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Connecticut. Weather varies year to year, so treat these as a guide.
More on dolphins in Connecticut:
Sightings of dolphins in Connecticut peak in September, when 2 of the year's 6 verified observations are logged — about 33.3% of the annual total. Activity stays high through September, April and May.
The quietest stretch is January, February and March, when dolphins are hardest to find — no verified records exist for January. If a reliable sighting matters, plan around the peak window rather than the off-season.
The dolphins you are most likely to encounter in Connecticut are Tamanend's Bottlenose Dolphin, Common Bottlenose Dolphin and Atlantic White-sided Dolphin — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see dolphins in Connecticut
- Appalachian National Scenic Trail — National Scenic Trail
- Coltsville National Historical Park — National Historical Park
- New England National Scenic Trail — National Scenic Trail
- Washington-Rochambeau Revolutionary Route National Historic Trail — National Historic Trail
- Weir Farm National Historical Park — National Historical Park
Frequently asked questions
What is the best month to see dolphins in Connecticut?+
September is the single best month, and the broader peak window runs through September, April and May, based on 6 verified iNaturalist observations.
When are dolphins hardest to see in Connecticut?+
January is the quietest month for dolphins in Connecticut, with no verified records on iNaturalist.
Are dolphins active year-round in Connecticut?+
Dolphins are recorded in 5 of 12 months in Connecticut, concentrated around September and April.
More places to see dolphins
More wildlife in Connecticut