Frequently Asked Questions
Q1: What is the average water temperature in the Red Sea?
A1: For travel planning, use 25–26°C (77–79°F) as a broad annual average for Egyptian Red Sea resorts. Cooler months sit near 21–23°C (70–73°F); late summer commonly reaches about 29°C (84°F) (Source: NOAA Coral Reef Watch, 2026; Bluewater Dive Travel, 2026).
Q2: When is the Red Sea warmest for swimming?
A2: August is usually the warmest month, with surface temperatures around 29°C (84°F) in Hurghada and up to about 30°C (86°F) around southern Red Sea resorts such as Marsa Alam. September often stays close to August, so it remains a strong warm-water month for swimming and snorkeling.
Q3: Do I need a wetsuit to snorkel in the Red Sea?
A3: From June through October, most snorkelers need no wetsuit. From November through April, most boat-trip snorkelers prefer a 3mm shorty or full suit; January and February call for a 5mm full suit for sessions longer than 45 minutes.
Q4: What is the coldest month in the Red Sea?
A4: February is typically the coldest water month, with Dahab and Hurghada near 21°C (70°F) and Marsa Alam around 22°C (72°F). Winter evenings can feel cool on boat decks, especially with wind chill.
Q5: When does coral spawn in the Red Sea?
A5: Red Sea Acropora spawning is documented in April and May, with northern Red Sea and Hurghada observations often falling from late April to early May rather than on a fixed number of nights after the full moon (Source: Frontiers in Marine Science, 2024; Reef Check/HEPCA, 2012). Treat any exact night-dive date as a local forecast, not a guaranteed annual event.
Q6: Is the Red Sea warmer than the Mediterranean?
A6: Yes compared with most Mediterranean winter dive sites: Hurghada is around 22°C (72°F) in January, while Malta is typically much cooler. It is not warmer than tropical destinations such as the Maldives or much of the Caribbean in winter, so the strongest claim is that the Red Sea is a warmer short-haul winter option from Europe.
Q7: What is the thermocline depth in the Red Sea?
A7: A thermocline is the transition between warmer surface water and cooler water below, and its depth varies by season (Source: NOAA, 2024). Northern Red Sea oceanography references place the summer thermocline at about 25 metres, so divers heading past 30 metres on deeper wrecks may feel a cooler layer even in summer.
Quick Summary
- Annual planning average: roughly 25–26°C (77–79°F) across Hurghada, Sharm El Sheikh, Marsa Alam, Dahab, and El Gouna (Source: NOAA Coral Reef Watch, 2026; NOAA NCEI, 2026).
- Warmest month: August at 29°C (84°F) in Hurghada and 30°C (86°F) in Marsa Alam.
- Coolest month: February at 21°C (70°F) in Dahab and 22°C (72°F) in Hurghada.
- No wetsuit needed: June–October. 3mm recommended in April, May, November, and December. 5mm recommended in January and February.
- Coral spawning window: documented Red Sea Acropora spawning falls in April and May, with Hurghada records commonly from late April to early May (Source: Frontiers in Marine Science, 2024; Reef Check/HEPCA, 2012).
- Best visibility: November–March, 25–40 metres, when plankton concentrations drop with cooler water.
Red Sea Water Temperature by Month and Location
The table below is a practical climatology compiled from NOAA SST products and commonly reported Red Sea dive-season ranges. Treat figures as monthly planning averages, not live readings.
| Location | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual avg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hurghada | 22°C / 72°F | 21°C / 70°F | 22°C / 72°F | 24°C / 75°F | 26°C / 79°F | 28°C / 82°F | 29°C / 84°F | 29°C / 84°F | 28°C / 82°F | 27°C / 81°F | 25°C / 77°F | 23°C / 73°F | 26°C / 79°F |
| Sharm El Sheikh | 22°C / 72°F | 21°C / 70°F | 22°C / 72°F | 24°C / 75°F | 26°C / 79°F | 27°C / 81°F | 29°C / 84°F | 29°C / 84°F | 28°C / 82°F | 26°C / 79°F | 25°C / 77°F | 23°C / 73°F | 25°C / 77°F |
| Marsa Alam | 23°C / 73°F | 22°C / 72°F | 23°C / 73°F | 25°C / 77°F | 27°C / 81°F | 28°C / 82°F | 29°C / 84°F | 30°C / 86°F | 29°C / 84°F | 28°C / 82°F | 26°C / 79°F | 24°C / 75°F | 26°C / 79°F |
| Dahab | 21°C / 70°F | 21°C / 70°F | 22°C / 72°F | 23°C / 73°F | 25°C / 77°F | 27°C / 81°F | 28°C / 82°F | 29°C / 84°F | 28°C / 82°F | 26°C / 79°F | 24°C / 75°F | 22°C / 72°F | 25°C / 77°F |
| El Gouna | 22°C / 72°F | 21°C / 70°F | 22°C / 72°F | 24°C / 75°F | 26°C / 79°F | 28°C / 82°F | 29°C / 84°F | 29°C / 84°F | 28°C / 82°F | 27°C / 81°F | 25°C / 77°F | 23°C / 73°F | 26°C / 79°F |
Air Temperature Paired with Sea Temperature
| Month | Air high | Air low | Sea surface | Sunshine hours/day |
|---|---|---|---|---|
| January | 22°C / 72°F | 11°C / 52°F | 22°C / 72°F | 8 |
| February | 23°C / 73°F | 12°C / 54°F | 21°C / 70°F | 9 |
| March | 26°C / 79°F | 14°C / 57°F | 22°C / 72°F | 9 |
| April | 30°C / 86°F | 18°C / 64°F | 24°C / 75°F | 10 |
| May | 34°C / 93°F | 22°C / 72°F | 26°C / 79°F | 11 |
| June | 37°C / 99°F | 25°C / 77°F | 28°C / 82°F | 13 |
| July | 38°C / 100°F | 27°C / 81°F | 29°C / 84°F | 13 |
| August | 38°C / 100°F | 27°C / 81°F | 29°C / 84°F | 12 |
| September | 35°C / 95°F | 25°C / 77°F | 28°C / 82°F | 11 |
| October | 32°C / 90°F | 22°C / 72°F | 27°C / 81°F | 10 |
| November | 27°C / 81°F | 17°C / 63°F | 25°C / 77°F | 9 |
| December | 23°C / 73°F | 13°C / 55°F | 23°C / 73°F | 8 |
Wetsuit Guide by Month
Most travellers underestimate Red Sea winters and overestimate summers. The table below is a practical comfort guide; exposure protection varies by wind, trip length, body type, and whether a diver is doing repetitive dives.
| Month | Snorkelers (30-min surface) | Snorkelers (90-min boat trip) | Divers (1 dive) | Divers (3-dive day) |
|---|---|---|---|---|
| January | 3mm shorty | 5mm full | 5mm full + hood | 7mm full + hood |
| February | 3mm shorty | 5mm full | 5mm full + hood | 7mm full + hood |
| March | shorty | 3mm full | 5mm full | 5mm full |
| April | no suit | shorty | 3mm full | 5mm full |
| May | no suit | no suit | 3mm full | 3mm full |
| June | no suit | no suit | shorty | 3mm full |
| July | no suit | no suit | no suit | shorty |
| August | no suit | no suit | no suit | shorty |
| September | no suit | no suit | shorty | 3mm full |
| October | no suit | shorty | 3mm full | 3mm full |
| November | shorty | 3mm full | 5mm full | 5mm full |
| December | 3mm shorty | 5mm full | 5mm full | 7mm full |
Best Months for Specific Activities
Snorkeling Without a Wetsuit
- Window: 1 June to 31 October across all five locations.
- Marsa Alam can stretch the season from mid-May into early November in warm years thanks to its southern latitude.
- Best house reefs to snorkel without gear: Mahmya Island (Hurghada), Abu Dabbab Bay (Marsa Alam), Eel Garden (Dahab).
- Wind-protected sites: El Gouna lagoon and Sahl Hasheesh bay are usually calmer than exposed offshore reefs on northerly-wind days.
Comfortable Diving Conditions
- Optimal range: 24–28°C (75–82°F) — April through November.
- May and October are local favourites: warm enough for a 3mm for many divers, usually less intense than peak summer heat, and often calmer in the morning.
- January and February attract technical and cold-water divers chasing 35-metre visibility.
- Routri verified diving excursions from Hurghada operate year-round with free cancellation.
Marine Life Sightings by Temperature
| Species | Peak season | Water temp range | Best location |
|---|---|---|---|
| Whale shark | May–July | 26–29°C | Marsa Alam (Marsa Mubarak) |
| Manta ray | August–October | 27–29°C | Marsa Alam (Daedalus Reef) |
| Spinner dolphins | Year-round | 21–30°C | Sataya Reef, Sha'ab Samadai |
| Hammerhead shark | June–August | 27–29°C | Sharm El Sheikh (Jackson Reef) |
| Green turtle | Year-round, peak Apr–Jun | 24–28°C | Marsa Alam (Abu Dabbab) |
| Coral spawning | April–May | 24–25°C | Hurghada house reefs |
Thermocline and Depth Profiles
From spring through autumn, a thermocline can develop in parts of the Egyptian Red Sea; NOAA defines a thermocline as the transition between warmer mixed surface water and cooler water below, and northern Red Sea oceanography references place the summer thermocline around 25 metres (Source: NOAA, 2024; Red Sea oceanography literature). This matters for three groups:
- Wreck divers on the Salem Express (32m) and Thistlegorm (30m) — add a 3mm vest in summer.
- Deep recreational divers exceeding 30 metres on Sha'ab El Erg or Elphinstone walls.
- Photographers descending past 25 metres for blue-water shots near Brothers Islands.
Red Sea Water Temperature and Visibility
Cooler water in the Red Sea correlates with higher visibility because plankton concentrations drop. Dive-condition reports commonly show:
- January–March: 25–40 metres visibility, water 21–22°C.
- April–June: 20–30 metres, water 24–28°C, occasional spring plankton blooms.
- July–September: 15–25 metres, water 28–30°C, summer plankton in southern reefs.
- October–November: 25–35 metres, water 25–27°C — the all-round sweet spot.
- Site-specific note: Ras Mohammed is often clearer than sheltered Hurghada bay reefs, but visibility changes with wind, current, and plankton.
How the Red Sea Compares to Other Destinations
| Destination | Winter avg (Jan) | Summer avg (Aug) | Annual avg | Wetsuit needed in winter |
|---|---|---|---|---|
| Red Sea (Hurghada) | 22°C / 72°F | 29°C / 84°F | 26°C / 79°F | 3–5mm |
| Maldives | 28°C / 82°F | 29°C / 84°F | 28°C / 82°F | None or shorty |
| Caribbean (Cozumel) | 26°C / 79°F | 29°C / 84°F | 27°C / 81°F | Shorty |
| Mediterranean (Malta) | 15°C / 59°F | 26°C / 79°F | 20°C / 68°F | 7mm full |
| Canary Islands | 19°C / 66°F | 23°C / 73°F | 21°C / 70°F | 5–7mm full |
| Thailand (Phuket) | 28°C / 82°F | 29°C / 84°F | 29°C / 84°F | None |
For European travellers, the Red Sea’s practical advantage is short-haul winter access to water that often stays around 21–23°C, while many Mediterranean sites are much colder. Egypt welcomed 15.78 million international visitors in 2024, a record year according to Egyptian government tourism reporting.
Local Insight
Three things only Hurghada-based operators will tell you:
- February water is genuinely cold for 90-minute boat snorkeling. Most international tour pages call it "still warm enough," but verified local suppliers issue 5mm full suits by default that month.
- Marsa Alam reefs often hold summer warmth longer than Hurghada. Moving a late-season trip south can improve no-wetsuit odds, especially in late October and early November.
- Coral spawning is a forecast-driven event, not a fixed calendar product. If local researchers or dive centres flag a late-April or early-May window, night-dive spaces can tighten quickly.
Sources
- NOAA Coral Reef Watch — CoralTemp daily 5 km satellite sea surface temperature product, 1985–present.
- NOAA NCEI — Extended Reconstructed Sea Surface Temperature (ERSST) monthly global SST analysis.
- Frontiers in Marine Science (2024) — spatial variation in Acropora spawning timing across the Red Sea, including Hurghada observations.
- Reef Check / HEPCA (2012) — synchronized coral spawning observation in the Hurghada area.
- NOAA National Ocean Service — thermocline definition and seasonal variability.
- Bluewater Dive Travel — Red Sea dive-condition ranges and wetsuit guidance.
