Best Time to See Dolphins in New Hampshire
July and August is the best time to see dolphins in New Hampshire. Based on 2 verified iNaturalist observations, here is exactly when dolphins are most active across the year in New Hampshire.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Atlantic White-sided Dolphin · Public domain CC0
2 verified observations of dolphins in New Hampshire, recorded across 2 months of the year on iNaturalist.
When dolphins are recorded in New Hampshire
Peak month
July
1 records (50% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 0 | 0% |
| June | 0 | 0% |
| Julypeak | 1 | 50% |
| Augustpeak | 1 | 50% |
| September | 0 | 0% |
| October | 0 | 0% |
| November | 0 | 0% |
| December | 0 | 0% |
Dolphins you are most likely to see
| Species | Verified observations |
|---|---|
| Atlantic White-sided Dolphin | 2 |
Weather to expect, source Open-Meteo
Typical weather in New Hampshire
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 72 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 24°F | 8°F | 4.1" |
| Feb | 25°F | 8°F | 3.6" |
| Mar | 34°F | 18°F | 3.3" |
| Apr | 45°F | 29°F | 5.2" |
| May | 58°F | 40°F | 4.1" |
| Jun | 67°F | 50°F | 4.8" |
| Julbest time | 72°F | 57°F | 7.1" |
| Augbest time | 70°F | 56°F | 4.5" |
| Sep | 63°F | 48°F | 4.5" |
| Oct | 53°F | 39°F | 5.6" |
| Nov | 38°F | 24°F | 4.2" |
| Dec | 30°F | 17°F | 6" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for New Hampshire. Weather varies year to year, so treat these as a guide.
Sightings of dolphins in New Hampshire peak in July, when 1 of the year's 2 verified observations are logged — about 50% of the annual total. Activity stays high through July and August.
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 New Hampshire are 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 New Hampshire
- Appalachian National Scenic Trail — National Scenic Trail
- Saint-Gaudens National Historical Park — National Historical Park
Frequently asked questions
What is the best month to see dolphins in New Hampshire?+
July is the single best month, and the broader peak window runs through July and August, based on 2 verified iNaturalist observations.
When are dolphins hardest to see in New Hampshire?+
January is the quietest month for dolphins in New Hampshire, with no verified records on iNaturalist.
Are dolphins active year-round in New Hampshire?+
Dolphins are recorded in 2 of 12 months in New Hampshire, concentrated around July and August.
More places to see dolphins
More wildlife in New Hampshire