June is the month when sea nettles first drift into the middle Chesapeake in numbers worth watching. Salinity is climbing after spring rains taper off, and the surface water is warm enough to support a bloom. The stings are not dangerous for most people, but a bad one can ruin a beach day and keep you out of the water for a week.
What it looks and feels like
- Immediate burning or stinging where tentacles touched the skin, often in lines or whip marks.
- Raised red welts that throb and itch for hours, sometimes flaring back up the next morning.
- Mild nausea or headache can happen with larger stings; most people just get localized pain and itch.
What to do right now
- Rinse with saltwater or seawater first - fresh water can trigger remaining stinging cells.
- Gently scrape off any tentacle fragments with a credit card or your fingernail, not a towel.
- Neutralize with white vinegar or a commercial jellyfish rinse; this stops remaining nematocysts from firing.
- Apply a baking soda paste or a cool, wet compress wrapped in a clean cloth for pain relief.
- Oral antihistamines help with the itch; 1% hydrocortisone calms lingering welts the next day.
- Pack a small sting kit in your beach bag this month: vinegar, hydrocortisone, and a few oral antihistamines.
Local note
On the lower Eastern Shore, nettles usually show first in the Choptank River mouth, around Deal Island, and the shallows of Tangier Sound before spreading north. The Atlantic surf at Assateague typically stays clear until late July. If you want to swim nettle-free in June, head ocean-side.
Respect the tentacles, enjoy the water anyway. See you in July.
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