Red Sea Dive Seasons — When to Go for What

The Red Sea is divable year-round, but the experience changes meaningfully by month.

December–February (winter)

Water 21–23 °C; air 18–22 °C. 5mm wetsuits standard. Lower crowds. Good visibility. Hammerhead schooling at the Brothers in Jan/Feb.

March–May (spring)

Water warming through 23–26 °C. The sweet spot for most divers — warm enough for 3mm, visibility consistently above 25m, and busy operators.

June–August (summer)

Water 27–30 °C. Skin / shorty thinness possible. Air can hit 40 °C topside. Whale shark sightings peak.

September–November (autumn)

Water cooling from 28 °C back through 25 °C. Strongest plankton blooms = manta encounters. Visibility excellent.

What this means for booking

Liveaboards in March–May and September–November book out 6+ months ahead. Day trip operators always have capacity. If you want big-animal encounters specifically, time the trip around them rather than your calendar.