Best Time to See Dolphins in Delaware
August, July and May is the best time to see dolphins in Delaware. Based on 228 verified iNaturalist observations, here is exactly when dolphins are most active across the year in Delaware.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Tamanend's Bottlenose Dolphin · inbetweenbays CC BY
Tamanend's Bottlenose Dolphin · inbetweenbays CC BY
Tamanend's Bottlenose Dolphin · inbetweenbays CC BY
228 verified observations of dolphins in Delaware, recorded across 11 months of the year on iNaturalist.
When dolphins are recorded in Delaware
Peak month
August
46 records (20.2% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 1 | 0.4% |
| February | 1 | 0.4% |
| March | 9 | 3.9% |
| April | 17 | 7.5% |
| Maypeak | 32 | 14% |
| June | 27 | 11.8% |
| Julypeak | 40 | 17.5% |
| Augustpeak | 46 | 20.2% |
| September | 22 | 9.6% |
| October | 32 | 14% |
| November | 1 | 0.4% |
| December | 0 | 0% |
Dolphins you are most likely to see
| Species | Verified observations |
|---|---|
| Tamanend's Bottlenose Dolphin | 210 |
| Common Dolphin | 1 |
Weather to expect, source Open-Meteo
Typical weather in Delaware
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 56 to 86 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 44°F | 32°F | 2.9" |
| Feb | 47°F | 33°F | 3.8" |
| Mar | 54°F | 39°F | 3.8" |
| Apr | 63°F | 48°F | 4.5" |
| Maybest time | 70°F | 56°F | 3.9" |
| Jun | 79°F | 66°F | 3.9" |
| Julbest time | 86°F | 73°F | 6" |
| Augbest time | 83°F | 72°F | 5.1" |
| Sep | 77°F | 65°F | 4.3" |
| Oct | 68°F | 55°F | 4.4" |
| Nov | 56°F | 43°F | 2.8" |
| Dec | 48°F | 36°F | 4.8" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for Delaware. Weather varies year to year, so treat these as a guide.
Sightings of dolphins in Delaware peak in August, when 46 of the year's 228 verified observations are logged — about 20.2% of the annual total. Activity stays high through August, July and May.
The quietest stretch is December, January and February, when dolphins are hardest to find — no verified records exist for December. If a reliable sighting matters, plan around the peak window rather than the off-season.
The dolphins you are most likely to encounter in Delaware are Tamanend's Bottlenose Dolphin and Common 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 Delaware
- Captain John Smith Chesapeake National Historic Trail — National Historic Trail
- Chesapeake Bay
- First State National Historical Park — National Historical Park
- Washington-Rochambeau Revolutionary Route National Historic Trail — National Historic Trail
Go see them · Delaware
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Frequently asked questions
What is the best month to see dolphins in Delaware?+
August is the single best month, and the broader peak window runs through August, July and May, based on 228 verified iNaturalist observations.
When are dolphins hardest to see in Delaware?+
December is the quietest month for dolphins in Delaware, with no verified records on iNaturalist.
Are dolphins active year-round in Delaware?+
Dolphins are recorded in 11 of 12 months in Delaware, so they can be seen year-round, with a clear peak in August.
More places to see dolphins
More wildlife in Delaware