Sea temperature and swimming season in San Pedro de Lloc
The sea off San Pedro de Lloc is comfortable for swimming from February to April. It peaks at 21.3°C in February and drops to 16.6°C in November.
Month by month
Sea temperature, the air you climb out into, and the wind that decides how that feels.
| Month | Sea | Air | Wind | Feels | What to wear |
|---|---|---|---|---|---|
| January | 18.9°C | 24.1°C | 2.9 m/s | Bracing | shorty, or nothing if you are acclimatised |
| February | 21.3°C | 27.9°C | 2.6 m/s | Comfortable | none, or a rash vest |
| March | 21.2°C | 26.2°C | 3.1 m/s | Comfortable | none, or a rash vest |
| April | 19.7°C | 23.3°C | 4.0 m/s | Comfortable | shorty, or nothing if you are acclimatised |
| May | 18.9°C | 24.0°C | 4.6 m/s | Bracing | shorty, or nothing if you are acclimatised |
| June | 18.9°C | 20.5°C | 4.8 m/s | Bracing | shorty, or nothing if you are acclimatised |
| July | 17.8°C | 20.6°C | 4.5 m/s | Bracing | 3/2 mm full suit |
| August | 17.2°C | 20.3°C | 4.5 m/s | Bracing | 3/2 mm full suit |
| September | 16.8°C | 19.0°C | 4.6 m/s | Bracing | 3/2 mm full suit |
| October | 16.6°C | 19.4°C | 4.8 m/s | Bracing | 3/2 mm full suit |
| November | 16.6°C | 21.5°C | 4.4 m/s | Bracing | 3/2 mm full suit |
| December | 17.6°C | 22.2°C | 3.8 m/s | Bracing | 3/2 mm full suit |
Air is the average daily maximum — roughly what you would meet swimming in the middle of the day. An arrow marks months where the air is colder than the sea.
When in the day can you swim?
Daylight and burn risk by month, in America/Lima local time.
| Month | Sunrise | Sunset | Daylight | Peak UV |
|---|---|---|---|---|
| January | 06:12 | 18:42 | 12h 30m | 15.4 |
| February | 06:22 | 18:42 | 12h 20m | 16.4 |
| March | 06:22 | 18:31 | 12h 09m | 16.4 |
| April | 06:19 | 18:16 | 11h 56m | 14.9 |
| May | 06:21 | 18:07 | 11h 47m | 12.7 |
| June | 06:27 | 18:09 | 11h 42m | 11.5 |
| July | 06:32 | 18:15 | 11h 44m | 12.0 |
| August | 06:26 | 18:18 | 11h 52m | 13.9 |
| September | 06:11 | 18:15 | 12h 04m | 15.9 |
| October | 05:55 | 18:11 | 12h 16m | 16.5 |
| November | 05:48 | 18:16 | 12h 27m | 15.7 |
| December | 05:56 | 18:29 | 12h 33m | 15.0 |
Open water burns faster than a beach: the surface reflects sunlight up at you, and sunscreen washes off in the first few minutes. A long swim under a UV index above 6 needs a rash vest more than it needs more cream.
What the bands mean
| From | Description | In practice |
|---|---|---|
| above 26°C | Bath-like | Warm enough that it offers no cooling at all |
| above 22°C | Very comfortable | Swimwear, no time limit for most people |
| above 19°C | Comfortable | Pleasant once you are in; most people swim happily |
| above 16°C | Bracing | Swimmable but short; many prefer a shorty wetsuit |
| above 12°C | Cold | Wetsuit territory. Unprotected swims should be brief |
| below 12°C | Dangerous | Cold shock risk. Specialist gear and supervision |
Do you need a wetsuit in San Pedro de Lloc?
Some months, yes. The sea drops to 16.6°C in November. What thickness, month by month, for swimming and for surfing →
Other coastal cities in Peru
Where these numbers come from, and what they miss
- Open water, not your beach. The measurement is a satellite cell about 28 km across, centred 14.6 km from San Pedro de Lloc. Shallow bays and lagoons run warmer; exposed coasts with upwelling run colder, sometimes by several degrees.
- Surface temperature. Below a few metres the sea is often noticeably colder, and in summer a warm surface layer can sit over much colder water.
- A six-year average, not a thirty-year normal. Sea temperature varies little between years, so this is close — but it is not a climate normal, and any individual year will differ.
- Averages hide storms. A monthly mean says nothing about the week a cold current arrives.