Jellyfishes in Alaska in September
Yes, September is a good month to see jellyfishes in Alaska. It is the 4th busiest month of the year, with 264 of the 1,763 sightings logged across the year (15%), 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 July 2, 2026.
Good month for jellyfishes in Alaska
15%
of yearly sightings
264
records in September
#4
busiest month of 12
1,763
verified records a year
August 23.4%, September 15%, October 7.9%. Busiest month is July at 23.7%.
1,763 verified observations of jellyfishes in Alaska, recorded across 12 months of the year on iNaturalist.
When jellyfishes are recorded in Alaska
Peak month
July
417 records (23.7% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 11 | 0.6% |
| February | 13 | 0.7% |
| March | 26 | 1.5% |
| April | 22 | 1.2% |
| May | 96 | 5.4% |
| Junepeak | 284 | 16.1% |
| Julypeak | 417 | 23.7% |
| Augustpeak | 413 | 23.4% |
| September | 264 | 15% |
| October | 139 | 7.9% |
| November | 47 | 2.7% |
| December | 31 | 1.8% |
Jellyfishes you are most likely to see
| Species | Verified observations |
|---|---|
| Pacific Lion's Mane Jelly | 751 |
| Northern Sea Nettle | 536 |
| Greater Moon Jelly | 284 |
| Egg-yolk Jelly | 31 |
| Brown-rimmed Moon Jelly | 16 |
| Pacific Sea Nettle | 1 |
In Alaska, September carries 15% of the year's jellyfishes sightings, about 6.7 points above an even month-to-month split. That makes it the 4th busiest of the twelve months, out of 12 months with recorded activity.
Activity is easing off from August (23.4%) into September, and it heads toward October (7.9%) after. The busiest month is July (23.7%), so if timing is flexible, that window is the safer bet.
The jellyfishes most often recorded in Alaska are Pacific Lion's Mane Jelly, Northern Sea Nettle and Greater Moon Jelly. 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 jellyfishes you are most likely to see
- Pacific Lion's Mane Jelly751 records
- Northern Sea Nettle536 records
- Greater Moon Jelly284 records
- Egg-yolk Jelly31 records
- Brown-rimmed Moon Jelly16 records
- Pacific Sea Nettle1 records
Plan your jellyfish trip in Alaska
Start with live tours near Alagnak Wild River, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
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Use the live GetYourGuide widget to compare local departures and activity styles close to the main jellyfish viewing area.
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Frequently asked questions
Can you see jellyfishes in Alaska in September?+
Yes. September accounts for 264 of the 1,763 verified jellyfishes sightings logged in Alaska across the year, which is 15% of the annual total.
Is September a good time to see jellyfishes in Alaska?+
September is the 4th busiest month. It is workable, though July and August is the stronger window for a reliable sighting.
What month is best for jellyfishes in Alaska?+
July is the single busiest month, with the broader peak running through July, August and June, based on 1,763 verified observations.
Which jellyfishes are you most likely to see in Alaska?+
The most-recorded species in Alaska are Pacific Lion's Mane Jelly, Northern Sea Nettle and Greater Moon Jelly, based on all-time iNaturalist counts.
See jellyfishes in Alaska in other months
More places to see jellyfishes
More wildlife in Alaska