Best Time to See Jellyfishes in New York
April, May and July is the best time to see jellyfishes in New York. Based on 712 verified iNaturalist observations, here is exactly when jellyfishes are most active across the year in New York.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
Dwarf Lion's Mane Jelly · Cameron Christopher Dunn CC BY-SA
Atlantic Lion's Mane Jelly · Zihao Wang CC BY
Atlantic Lion's Mane Jelly · David LaMagna CC BY
712 verified observations of jellyfishes in New York, recorded across 12 months of the year on iNaturalist.
When jellyfishes are recorded in New York
Peak month
April
159 records (22.3% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 1 | 0.1% |
| February | 3 | 0.4% |
| March | 38 | 5.3% |
| Aprilpeak | 159 | 22.3% |
| Maypeak | 134 | 18.8% |
| June | 49 | 6.9% |
| Julypeak | 128 | 18% |
| August | 93 | 13.1% |
| September | 41 | 5.8% |
| October | 33 | 4.6% |
| November | 27 | 3.8% |
| December | 6 | 0.8% |
Jellyfishes you are most likely to see
| Species | Verified observations |
|---|---|
| Atlantic Lion's Mane Jelly | 200 |
| Bay Nettle | 66 |
| Dwarf Lion's Mane Jelly | 66 |
| Common Moon Jelly | 46 |
| Mushroom Jelly | 39 |
| Cannonball Jelly | 22 |
| Mauve Stinger | 7 |
| Atlantic Sea Nettle | 6 |
Weather to expect, source Open-Meteo
Typical weather in New York
Recent typical conditions by month, so you can plan a trip around both when jellyfishes are active and what the weather is doing. The best months to look for jellyfishes sit around 34 to 77 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 29°F | 15°F | 3.7" |
| Feb | 32°F | 16°F | 3.6" |
| Mar | 41°F | 23°F | 3.8" |
| Aprbest time | 52°F | 34°F | 4.9" |
| Maybest time | 63°F | 45°F | 3.9" |
| Jun | 72°F | 55°F | 3.8" |
| Julbest time | 77°F | 61°F | 5.3" |
| Aug | 75°F | 60°F | 5.3" |
| Sep | 68°F | 53°F | 3.4" |
| Oct | 58°F | 44°F | 5.1" |
| Nov | 43°F | 30°F | 3.3" |
| Dec | 36°F | 24°F | 4.7" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for New York. Weather varies year to year, so treat these as a guide.
Sightings of jellyfishes in New York peak in April, when 159 of the year's 712 verified observations are logged — about 22.3% of the annual total. Activity stays high through April, May and July.
The quietest stretch is January, when jellyfishes are hardest to find — January sees just 1 records. If a reliable sighting matters, plan around the peak window rather than the off-season.
The jellyfishes you are most likely to encounter in New York are Atlantic Lion's Mane Jelly, Bay Nettle and Dwarf Lion's Mane Jelly — 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 jellyfishes in New York
- Appalachian National Scenic Trail — National Scenic Trail
- Captain John Smith Chesapeake National Historic Trail — National Historic Trail
- Chesapeake Bay
- Fire Island National Seashore — National Seashore
- Martin Van Buren National Historic Site — National Historic Site
- National Parks of New York Harbor
Frequently asked questions
What is the best month to see jellyfishes in New York?+
April is the single best month, and the broader peak window runs through April, May and July, based on 712 verified iNaturalist observations.
When are jellyfishes hardest to see in New York?+
January is the quietest month for jellyfishes in New York, with only 1 verified records.
Are jellyfishes active year-round in New York?+
Jellyfishes are recorded in 12 of 12 months in New York, so they can be seen year-round, with a clear peak in April.
More places to see jellyfishes
More wildlife in New York