Philadelphia, PA Tide Chart
Live NOAA tide predictions for Philadelphia, PA — station 8545240 (Philadelphia, Pier 11 North). Today's high and low tide times, a scrollable tide graph, and every high tide up to a year out, with a ⚠ flag when storm weather coincides.
Tide chart
Every high, low and everything in between — hover or tap the curve for exact heights. Feet above MLLW, station local time. Dark bands are nighttime; red shading marks forecast 🌀 storm windows — the darker the red, the stronger that hour of the storm (next 16 days); the thin blue line across the top is barometric pressure (falling pressure = rising water). Dots mark highs/lows; red dots are highs a storm may intensify — especially with wind blowing onshore, which piles water against the coast.
Next king tides
The biggest tides of the coming year at this station — the windows most likely to bring minor coastal flooding, and the best days for extreme-low-tide beachcombing right after.
Computed from a full year of NOAA predictions: the top 10% of high tides, grouped into date windows.
Sun & moon
Find high tides by date
Pick any range up to a year out — handy for planning around the biggest (or smallest) tides.
Storm overlay on: 🌀 rows mark forecast storm windows in line with the tides they may intensify, and affected highs show a minimum surge estimate (inverse-barometer rule, ~1 ft per 30 hPa below normal — wind can add much more). Off: the pure astronomical tide.
Storm & wind outlook
⚠ marks a high tide whose forecast hour shows 35+ mph gusts, 25+ mph sustained wind, pressure at or below 996 hPa, or heavy rain. Storms — especially onshore wind plus low pressure — can push the real water level well above the predicted tide. This is an advisory aid, not a warning service: follow the National Weather Service for safety decisions.
About this station
NOAA station 8545240 (Philadelphia, Pier 11 North) sits at 39.93, -75.14 on the tidal Delaware River. Predictions on this page come straight from NOAA's harmonic model for this station — heights in feet above MLLW, times in the station's local time. Conditions a few miles along the shore can differ, so pick the station nearest where you'll actually be.
Nearest stations: Atlantic City, NJ (55 mi) · Cape May, NJ (67 mi) · Sandy Hook, NJ (70 mi) · Lewes, DE (79 mi) · New York, NY (80 mi)
More tide stations
Where does the tide data come from?
Straight from NOAA CO-OPS, the official U.S. source for tide predictions — for Philadelphia, PA it uses the NOAA station listed above. Heights are in feet above MLLW (mean lower low water, the standard chart datum) and times are shown in the station's own local time.
How far ahead can I see the tides?
Tide predictions are computed from astronomy (the positions of the moon and sun), so they're available about a year ahead. Use the date-range finder to list every high tide between any two dates — for planning a beach day, a boat launch, fishing or photography.
What is a king tide?
An informal name for the highest tides of the year, which happen when a new or full moon lines up with the moon's closest approach to Earth. In the finder, the top 10% highest tides in your range are marked with a crown — those are king-tide territory, and the most likely to cause minor coastal flooding.
Does weather change the tide?
Tide predictions are astronomy only — they don't include weather. A storm's onshore winds and low pressure can push the actual water level well above the prediction (storm surge). That's why high tides that coincide with gale-force gusts, strong winds, low pressure or heavy rain in the 16-day forecast get a ⚠ flag here — and the storm-overlay toggle lets you view the table with storm windows and surge estimates, or the pure astronomical tide on its own. For safety decisions, always follow official National Weather Service warnings.
What actually makes the tide bigger or smaller?
The engine is gravity: the moon and sun pull the ocean into bulges. When they line up at a new or full moon you get the biggest swings (spring tides); at quarter moons their pulls partly cancel (neap tides), and the moon's closest approach (perigee) super-sizes things further — that's a king tide. On top of that astronomy, weather moves the water: wind blowing toward the land physically piles water against the coast and can make a high tide noticeably taller (blowing offshore does the opposite), and barometric pressure acts like a lid — roughly every 30 hPa the pressure drops lets the sea rise about a foot (the inverse-barometer effect). River flooding, the shape of the bay, and even long-term sea-level cycles stack on top. That's why the chart shows a barometric-pressure line and shades storm windows red: the prediction is astronomy, and weather is the difference between the prediction and your ankles.
What are the highest tides in the world — and in the U.S.?
The world's largest tides are in Canada's Bay of Fundy, where the range between low and high can top 50 feet (it's outside NOAA's network, so it isn't listed here). In the U.S., the giants are Alaska's Cook Inlet — Anchorage sees swings around 26–30 feet — along with Southeast Alaska ports like Skagway, and on the East Coast, Eastport, Maine at roughly 18 feet. All of those have dedicated pages here.
Can I save my home beach and other spots I follow?
Yes — tap ☆ Follow on any station to add it to your list, and Set as default to make it the one that loads first on the tides home page. Your list appears in the "My stations" dropdown for one-tap switching. Everything is stored on your device; no account needed.
Is this free? Do I need an account?
Completely free, no sign-up. It's built on public NOAA and Open-Meteo data and works on any device.