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The Red Sea is a bucket-list destination for every serious scuba diver. With its crystal-clear waters, vibrant coral gardens, and a collection of world-famed shipwrecks, it offers some of the most accessible and spectacular diving on the planet. However, because the region experiences distinct seasonal shifts, the “best” time to visit depends entirely on what you want to see.
Whether you are hunting for the elusive hammerhead shark, wanting to explore the iconic SS Thistlegorm, or simply looking for the warmest water possible, timing is everything. From the scorching heat of the Egyptian summer to the refreshing breezes of the winter months, each season brings a different character to the underwater world.
In this guide, we will break down the best time to dive the Red Sea. We will cover water temperatures, typical marine life sightings, and the best regions to visit at different times of the year. By the end of this article, you will know exactly when to book your flight to experience the very best of Egypt – Red Sea.
The Red Sea is essentially a narrow strip of water surrounded by desert. This geography creates a unique climate where air temperatures can swing wildly while the water remains relatively stable. Generally, the diving season is split into the cooler winter (December to March) and the hot summer (June to September), with “shoulder” seasons in between that offer a balance of both.
During these months, the air temperature drops to a comfortable 20-25°C (68-77°F), but the water temperature hits its annual low, averaging around 22°C (72°F). While this is still warm compared to many regions, the wind-chill on the boat can be significant. This is the best time for those who want to avoid the scorching desert heat, but you will certainly need a 5mm or 7mm wetsuit. Underwater visibility remains excellent, often exceeding 30 meters.
Many veterans consider this the prime time to visit Egypt – Red Sea. As the water begins to warm up, reaching 24-26°C (75-79°F), marine life activity increases. April and May are famous for plankton blooms, which might slightly reduce visibility but bring in the ocean’s giants. This is the peak season for whale shark sightings, particularly in the northern sectors.
If you can handle the heat, the summer months offer the most prolific fish action. Air temperatures can soar above 40°C (104°F), and the water becomes a “bath-like” 29-30°C (84-86°F). This is the best time for hammerhead shark encounters, especially at offshore reefs like Daedalus and the Brothers. The sharks tend to stay deeper to find cooler thermoclines, so be prepared for some deep blue diving.
As the blistering heat of summer fades, autumn provides a second “sweet spot.” Water temperatures remain warm (around 27°C), but the air becomes much more pleasant. This is a fantastic time for wreck diving, as the calm seas make it easier to moor at sites like the SS Thistlegorm. It is also a high-activity period for thresher sharks and oceanic whitetips (Longimanus), which start appearing around the offshore plateaus.
The Red Sea is vast, and the timing of your trip should also depend on which itinerary you choose. The Northern Red Sea, centered around Sharm El Sheikh and Hurghada, focuses on world-class wrecks and the stunning reefs of Ras Mohammed. Because it is further north, the water is generally 1-2 degrees cooler than the south.
The Southern Red Sea, including Marsa Alam and the deep south sites like St. Johns, is more remote. Here, the water stays warmer longer into the winter. If you are traveling in January or February, heading south is your best bet for avoiding the chill.
When preparing for your trip, consider your gear requirements carefully. Since the Red Sea offers everything from shallow coral gardens to deep, current-swept walls, your equipment needs to be versatile. If you are upgrading your kit before the trip, consult The Ultimate Guide to Choosing Your First Dive Computer to ensure you have a device capable of handling the multiple dives per day typical of an Egyptian itinerary.
January & February: Best for avoiding crowds. Sightings of oceanic whitetips are common in the south.
March & April: Start of the “Big Fish” season. Manta rays and whale sharks begin to appear.
May & June: Peak whale shark season in the north. Schooling fish gather at Ras Mohammed for spawning.
July & August: Hammerhead season. Best time for photographers who want clear, blue water and high light levels.
September & October: The most balanced months. Perfect for all-around diving, including wrecks and reefs.
November & December: Thresher shark season starts. Great for those looking for cooler air temperatures and festive atmosphere.
Whether you are looking for the adrenaline of a shark encounter or the haunting beauty of a historic shipwreck, timing your trip to the Red Sea’s natural cycles will ensure an unforgettable underwater experience. Unlike the lush jungles of Raja Ampat, the Red Sea offers a stark, beautiful contrast between the barren desert and the neon-colored life beneath the waves.
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