Updated
Portsmouth Harbor
Bay
Cool water — ease in carefully
Use cautionCool water — ease in carefully: water temperature is 66°F, cool enough to cause cold-water shock on a sudden entry.
- Water temperature is 66°F, cool enough to cause cold-water shock on a sudden entry.
bay in Rockingham County, United States of America
Interactive map not available
Cool water — ease in carefully
Use cautionCool water — ease in carefully: water temperature is 66°F, cool enough to cause cold-water shock on a sudden entry.
- Water temperature is 66°F, cool enough to cause cold-water shock on a sudden entry. — NOAA buoy SEIM1, as of Aug 22, 7:30 AM UTC
No official beach-advisory feed for Maine yet — follow posted signs and local guidance.
Live data from NOAA buoy SEIM1 (1.5 mi away), as of Aug 22, 7:30 AM UTC.
Weather at Portsmouth Harbor
Sponsored gear checklist
Pack smarter for Portsmouth Harbor
Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.
As an Amazon Associate we earn from qualifying purchases.
Frequently asked questions
- Where is Portsmouth Harbor?
- Portsmouth Harbor is a bay in Maine.
- What is the water temperature at Portsmouth Harbor?
- As of August 22, 2026, the water temperature at Portsmouth Harbor in Maine is 66°F (19°C), measured by NOAA buoy SEIM1, 1.5 miles away.
- Can you swim at Portsmouth Harbor?
- Cool water — ease in carefully: water temperature is 66°F, cool enough to cause cold-water shock on a sudden entry. Checked August 22, 2026.
Advertisement
Visitor Reviews
Be the first to share your experience here
Join our community to share your water adventures
Earn badges as you share your experiences!
No reviews yet — share what you know
Been here? A quick note helps the next visitor plan their day. Handy things to mention:
Best Times to Visit
- ›Weekday mornings (8–10 AM) are typically less crowded
- ›Check the forecast 2–3 days ahead for best planning
- ›Avoid holiday weekends for a quieter experience
Location & Contact
Maine
</> Embed this location on your site
Paste this snippet into your website to show a live badge for Portsmouth Harbor — free to use with the included credit link.