Is the San Pedro Channel rough? What to expect on the crossing
Usually not. The channel is about 17 miles wide, the ferries cross it in 1 to 1.5 hours, and waves above 9 feet are recorded less than 2 percent of the time in any month in these coastal waters. Spring is the roughest season and late summer the calmest.
Crossing the San Pedro Channel this week? Dizzout is drug-free sound therapy you can start in your seat on the crossing, with relief in about 90 seconds.Starts in your browser · works with any headphones
Stop seasickness. Get your personalized Dizzout plan. Paid subscription for full access.
On your phone? Scan to start there.
Channel · Southern California · Reputation among passengers: mixed: commonly reported as uncomfortable in the wrong conditions.
- Low
- Moderate
- High
- Very high
Roughness summarises typical reported conditions for this crossing, not a forecast for any given sailing.
Open Pacific channel, spring peak
In the Nausea Index table of the 121 sea crossings we cover, the San Pedro Channel is rated manageable, one of 81 in that band, with 40 rated higher. Full table: the roughest sea crossings, ranked.
Key facts
- The San Pedro Channel is a channel, and passenger reports place it in the moderate roughness band.
- The mechanism behind that reputation: Open Pacific channel, spring peak.
- Conditions are reported roughest in March and April.
- The calmest months are usually July, August, September and October.
- It is also known as Catalina Channel.
Why does the San Pedro Channel get rough?
San Pedro Channel is about 17 miles wide between the mainland, from Point Fermin to Point Vicente, and Santa Catalina Island. It is open water on the Pacific side, and the NOAA Coast Pilot says strong winds and rough seas, while less frequent than farther north, can be a problem on this coast from the middle of fall through late spring. In the coastal waters between 31 and 34 degrees north, waves above 9 feet are recorded 0.3 to 1.8 percent of the time, most often in March and April. Currents in the channel are weak: the Coast Pilot gives 0.2 knot for the tidal current and says currents above 1 knot are infrequent.
When is the San Pedro Channel roughest?
March and April are the roughest months in the NOAA Coast Pilot's wave table, with waves above 9 feet about 1.7 to 1.8 percent of the time, against 0.3 percent in August. Winds above 33 knots are recorded 0.0 to 0.1 percent of the time from June to September. Strong winds and rough seas can be a problem from the middle of fall through late spring.
| Roughest water in Jan | Roughest water in Feb | Roughest water in Mar | Roughest water in Apr | Roughest water in May | Roughest water in Jun | Roughest water in Jul | Roughest water in Aug | Roughest water in Sep | Roughest water in Oct | Roughest water in Nov | Roughest water in Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mixed | Mixed | Rough | Rough | Mixed | Mixed | Calm | Calm | Calm | Calm | Mixed | Mixed |
Typical seasonal pattern, not a forecast. Any month can deliver a calm crossing or a bad one. Check the marine forecast for your sailing date. Select a month to see every sea and ferry crossing ranked for it.
Where to be on board
Front to back
- Bow (front)Avoid
- MidshipBest
- Stern (aft)OK
The crossing: 1 to 1.5 hours
Roughest stretch: The open channel between the mainland breakwater and Avalon Bay
Sit midship and low down, by a window with the horizon in view. The crossing is about an hour, so settle in before you leave the breakwater.
Get your read
A few quick questions about you, then your trip. Nothing is saved or sent.
Step 1: about you
How you usually react to travel is the single best signal. These come from the validated MSSQ.
Step 2: your trip
Pick the kind of trip you are planning.
Crossing the San Pedro Channel? Have Dizzout ready
Stop seasickness
Dizzout is drug-free sound therapy you can start in your seat on the crossing, with relief in about 90 seconds. It plays precisely calibrated audio through any headphones you already own, wired or Bluetooth. Free to download.
Get your personalized Dizzout plan. Paid subscription for full access.
30,000+ travelers in 30+ countries · How we count
On your phone? Scan to start there.
Comparing apps first? See how the motion sickness apps compare
Not travelling yet? Remind me the day before my trip
Know someone who gets motion sick?
Send them the app that helps stop it, drug-free, in about 90 seconds, works with any headphones. Free to download.
The crossings that cross it
| Route | Typical duration | What to know |
|---|---|---|
| Long Beach to Avalon | About 1 hour | Catalina Express, the shortest time at sea of its three mainland ports. |
| San Pedro to Avalon | About 1 hour 15 minutes | Catalina Express. |
| Dana Point to Avalon | About 1 hour 30 minutes | Catalina Express, the longest of the three. |
What helps on this crossing
- Pick the port by the clock. Catalina Express lists about 1 hour from Long Beach, 1 hour 15 minutes from San Pedro and 1 hour 30 minutes from Dana Point, so Long Beach means the least time at sea.
- Pick your month. Waves above 9 feet are most frequent in March and April and least frequent in August, so late summer is the easier bet.
- Sit midship by a window and keep your eyes on the horizon. Put your phone away for the hour: the crossing is short enough to wait.
For the full toolkit see the seasickness guide, or what to do once it has already started. For what the trials actually say about the oldest trick on that list, see the verdict on looking at the horizon. If the rocking follows you ashore afterwards, that is land sickness, which is normal, and it passes.
Frequently asked questions
Is the San Pedro Channel rough in April?
April is one of the roughest months on this coast. The NOAA Coast Pilot puts waves above 9 feet at 1.8 percent of the time in the coastal waters between 31 and 34 degrees north, the highest of any month, with March close behind at 1.7 percent. That is still a small share of the time. Catalina Express can cancel for adverse weather, so check your sailing on the day.
Is the San Pedro Channel rough in August?
Usually not. August has the lowest share of waves above 9 feet in the NOAA Coast Pilot table, 0.3 percent, and winds above 33 knots are recorded 0.0 percent of the time in July and August.
Which Catalina Express crossing is the shortest?
Long Beach to Avalon, at approximately 1 hour. San Pedro to Avalon takes approximately 1 hour 15 minutes and Dana Point to Avalon approximately 1 hour 30 minutes.
Does the Santa Ana wind affect the Catalina crossing?
It can in fall and winter. The Santa Ana is a strong offshore wind from the north-east or east. The NOAA Coast Pilot says northeast Santa Ana winds occasionally blow at Santa Catalina Island during the fall and winter, and that beyond 50 miles from shore they are of little concern.
Is the San Pedro Channel rough in winter?
Not usually. In a typical year, December, January and February are all rated mixed. Its roughest months are usually March and April. This is the typical pattern, not a forecast for any sailing.
Other crossings
Sources & further reading
Sea conditions described here are typical patterns drawn from published marine and operator information as of July 2026, not a forecast: conditions on any given sailing depend on the weather that day, and any month can deliver a calm crossing or a bad one. Route and operator names are trademarks of their respective owners; Dizzout is not affiliated with or endorsed by them. Seasickness sensitivity varies from person to person; this page is informational and not medical advice.