Jellyfishes in Texas in September
Yes, September is a good month to see jellyfishes in Texas. It is the 5th busiest month of the year, with 410 of the 4,161 sightings logged across the year (9.9%), 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 Texas
9.9%
of yearly sightings
410
records in September
#5
busiest month of 12
4,161
verified records a year
August 4.7%, September 9.9%, October 13.2%. Busiest month is October at 13.2%.
4,161 verified observations of jellyfishes in Texas, recorded across 12 months of the year on iNaturalist.
When jellyfishes are recorded in Texas
Peak month
October
550 records (13.2% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 289 | 6.9% |
| February | 163 | 3.9% |
| March | 231 | 5.6% |
| April | 279 | 6.7% |
| May | 291 | 7% |
| Junepeak | 462 | 11.1% |
| July | 319 | 7.7% |
| August | 196 | 4.7% |
| September | 410 | 9.9% |
| Octoberpeak | 550 | 13.2% |
| Novemberpeak | 523 | 12.6% |
| December | 448 | 10.8% |
Jellyfishes you are most likely to see
| Species | Verified observations |
|---|---|
| Cannonball Jelly | 1,267 |
| Bay Nettle | 821 |
| Southern Moon Jelly | 747 |
| Atlantic Sea Nettle | 113 |
| Mushroom Jelly | 48 |
| Australian Spotted Jelly | 31 |
| Pink Meanie | 20 |
| Common Moon Jelly | 18 |
In Texas, September carries 9.9% of the year's jellyfishes sightings, about 1.6 points above an even month-to-month split. That makes it the 5th busiest of the twelve months, out of 12 months with recorded activity.
Activity is rising from August (4.7%) into September, and it heads toward October (13.2%) after. The busiest month is October (13.2%), so if timing is flexible, that window is the safer bet.
The jellyfishes most often recorded in Texas are Cannonball Jelly, Bay Nettle and Southern 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
- Cannonball Jelly1,267 records
- Bay Nettle821 records
- Southern Moon Jelly747 records
- Atlantic Sea Nettle113 records
- Mushroom Jelly48 records
- Australian Spotted Jelly31 records
Plan your jellyfish trip in Texas
Start with live tours near Amistad National Recreation Area, then compare a nearby stay and a broader wildlife backup before you lock in the trip.
GetYourGuide
Live tours nearbySee live tours near Amistad National Recreation Area
Use the live GetYourGuide widget to compare local departures and activity styles close to the main jellyfish viewing area.
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Stay nearbyStay near Amistad National Recreation Area
Compare hotels, cabins and lodges close to the best jellyfish viewing area in Texas.
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Broader backupBook a jellyfish tour in Texas
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 jellyfishes in Texas in September?+
Yes. September accounts for 410 of the 4,161 verified jellyfishes sightings logged in Texas across the year, which is 9.9% of the annual total.
Is September a good time to see jellyfishes in Texas?+
September is the 5th busiest month. It is workable, though October and November is the stronger window for a reliable sighting.
What month is best for jellyfishes in Texas?+
October is the single busiest month, with the broader peak running through October, November and June, based on 4,161 verified observations.
Which jellyfishes are you most likely to see in Texas?+
The most-recorded species in Texas are Cannonball Jelly, Bay Nettle and Southern Moon Jelly, based on all-time iNaturalist counts.
See jellyfishes in Texas in other months
More places to see jellyfishes