Dolphins in Delaware in September
Yes, September is a good month to see dolphins in Delaware. It is the 6th busiest month of the year, with 22 of the 228 sightings logged across the year (9.6%), based on verified iNaturalist records.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Good month for dolphins in Delaware
9.6%
of yearly sightings
22
records in September
#6
busiest month of 12
228
verified records a year
August 20.2%, September 9.6%, October 14%. Busiest month is August at 20.2%.
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 |
In Delaware, September carries 9.6% of the year's dolphins sightings, about 1.3 points above an even month-to-month split. That makes it the 6th busiest of the twelve months, out of 11 months with recorded activity.
Activity is easing off from August (20.2%) into September, and it heads toward October (14%) after. The busiest month is August (20.2%), so if timing is flexible, that window is the safer bet.
The dolphins most often recorded in Delaware are Tamanend's Bottlenose Dolphin and Common Dolphin. Those counts are annual totals rather than a September split, so treat them as which species you are likely to encounter, while the month figures above show how many sightings fall in September itself.
Which dolphins you are most likely to see
- Tamanend's Bottlenose Dolphin210 records
- Common Dolphin1 records
Plan your dolphin trip in Delaware
Start with live tours near Captain John Smith Chesapeake National Historic Trail, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Captain John Smith Chesapeake National Historic Trail
Use the live GetYourGuide widget to compare local departures and activity styles close to the main dolphin viewing area.
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Stay nearbyStay near Captain John Smith Chesapeake National Historic Trail
Compare hotels, cabins and lodges close to the best dolphin viewing area in Delaware.
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Broader backupBook a dolphin tour in Delaware
Compare guided wildlife tours, boat trips and nature experiences if you want a second travel network beyond the live widget.
Frequently asked questions
Can you see dolphins in Delaware in September?+
Yes. September accounts for 22 of the 228 verified dolphins sightings logged in Delaware across the year, which is 9.6% of the annual total.
Is September a good time to see dolphins in Delaware?+
September is the 6th busiest month. It is workable, though August and July is the stronger window for a reliable sighting.
What month is best for dolphins in Delaware?+
August is the single busiest month, with the broader peak running through August, July and May, based on 228 verified observations.
Which dolphins are you most likely to see in Delaware?+
The most-recorded species in Delaware are Tamanend's Bottlenose Dolphin and Common Dolphin, based on all-time iNaturalist counts.
See dolphins in Delaware in other months
More places to see dolphins
More wildlife in Delaware