Hydra weather by month: when to swim and when to walk the island
A monthly weather table for Hydra, the car-free island two hours from Piraeus, with tips for each season.
- July–August are very hot: up to 32°C, sea about 24°C.
- September is excellent: up to 28°C with the sea still at 24°C.
- Winter is 8–14°C with about 12 rain days a month.
On Hydra you walk and climb steps, so heat matters more. For both walking and swimming, late spring and September are the sweet spot.
Hydra weather by month
Hydra lies in the Saronic Gulf off the Peloponnese coast. There are no cars, so you get around on foot, on steps and stone paths, and summer heat is felt strongly. Figures are from the Hydra station on Climates to Travel (about 510 mm of rain a year), rounded.
| Month | Low | High | Rain days | Sea |
|---|---|---|---|---|
| January | 8° | 12° | 12 | 16° |
| February | 8° | 13° | 10 | 15° |
| March | 10° | 16° | 8 | 15° |
| April | 13° | 19° | 5 | 16° |
| May | 17° | 24° | 4 | 18° |
| June | 22° | 29° | 2 | 21° |
| July | 25° | 32° | 1 | 24° |
| August | 25° | 32° | 1 | 24° |
| September | 22° | 28° | 3 | 24° |
| October | 17° | 23° | 6 | 21° |
| November | 13° | 18° | 9 | 19° |
| December | 10° | 14° | 12 | 17° |
Hydra in summer
July and August reach 32°C with warm nights (about 25°C). Hydra has no big sandy beaches: you swim mostly from rock platforms near the harbour and in coves reached by water taxi. Save the stair climbs for mornings and evenings.
Hydra in September and October
September may be the best month: 22–28°C with the sea still around 24°C. October brings 17–23°C and a sea of about 21°C, ideal for walking up to the monasteries above town, with around 6 rain days.
Hydra in spring
April–May are pleasant for walking (13–24°C), greener and quieter, though the sea is still 16–18°C.
Hydra in winter
Winter runs 8–14°C with 10–12 rain days a month and occasional strong winds that disrupt fast boats. The island stays open and some restaurants operate. See Hydra in winter.
Best time to visit Hydra
- Swimming: June to late September.
- Walking and quiet: April–May and October.
- Day trip from Athens: all year, if you check weather and sailings first.
Getting there: ferry from Athens to Hydra. More: Greece weather by month.
FAQ
What is the weather like on Hydra in October? 17–23°C, sea about 21°C and around 6 rain days, good for walking and swimming on warm days.
Can you swim on Hydra in September? Yes, the sea averages about 24°C, as warm as August.
Are Hydra boats cancelled in winter? Sometimes, on days with strong wind. Check your sailing on the day.
How hot is Hydra in August? On average up to 32°C by day and about 25°C at night.
