Best Time to See Whales in Delaware
August, July and May is the best time to see whales in Delaware. Based on 254 verified iNaturalist observations, here is exactly when whales 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.
Humpback Whale · botanygirl CC BY
Humpback Whale · Public domain CC0
Tamanend's Bottlenose Dolphin · inbetweenbays CC BY
254 verified observations of whales in Delaware, recorded across 12 months of the year on iNaturalist.
When whales are recorded in Delaware
Peak month
August
48 records (18.9% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 2 | 0.8% |
| February | 2 | 0.8% |
| March | 11 | 4.3% |
| April | 19 | 7.5% |
| Maypeak | 36 | 14.2% |
| June | 29 | 11.4% |
| Julypeak | 46 | 18.1% |
| Augustpeak | 48 | 18.9% |
| September | 23 | 9.1% |
| October | 34 | 13.4% |
| November | 2 | 0.8% |
| December | 2 | 0.8% |
Whales you are most likely to see
| Species | Verified observations |
|---|---|
| Tamanend's Bottlenose Dolphin | 217 |
| Humpback Whale | 12 |
| Fin Whale | 2 |
| 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 whales are active and what the weather is doing. The best months to look for whales 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 whales in Delaware peak in August, when 48 of the year's 254 verified observations are logged — about 18.9% of the annual total. Activity stays high through August, July and May.
The quietest stretch is January, February and November, when whales are hardest to find — January sees just 2 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The whales you are most likely to encounter in Delaware are Tamanend's Bottlenose Dolphin, Humpback Whale and Fin Whale — 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 whales 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
Frequently asked questions
What is the best month to see whales in Delaware?+
August is the single best month, and the broader peak window runs through August, July and May, based on 254 verified iNaturalist observations.
When are whales hardest to see in Delaware?+
January is the quietest month for whales in Delaware, with only 2 verified records.
Are whales active year-round in Delaware?+
Whales are recorded in 12 of 12 months in Delaware, so they can be seen year-round, with a clear peak in August.
More places to see whales
More wildlife in Delaware