Best time to visit Hydra
Re-score for me — drag the dial — every chart recolours live for your heat & sea limits 27°C · sea 29°C
Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.
Default 29 °C is the Beach Climate Index "bathtub" line (Morgan et al.) — where the sea stops being refreshing and starts feeling like a warm bath.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.
Compare with another destination
Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.
Similar climatesAthens98% · Spetses98% · Nafplio97%
Other destinations with the most-alike year-round climate to Hydra (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Hydra's. Based on the 2020-2024 climatology, not this year's actual weather.
Month-by-month
| Month | Temp °C | Feels °C | Rain days | Rain h | Rain h/day | Humidity | Wind km/h | Sun h | UV | Interest | Score |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 9–14 | 11 | 8 | 79 | 9.9 | 63% | 22 | 175 | 2 | Quiet | 8 |
| Feb | 9–15 | 12 | 5 | 67 | 13.4 | 60% | 20 | 186 | 3 | Quiet | 8 |
| Mar | 10–16 | 13 | 8 | 78 | 9.8 | 55% | 19 | 223 | 4 | Quiet | 8 |
| Apr | 13–20 | 18 | 5 | 52 | 10.4 | 48% | 19 | 248 | 6 | Quiet | 10 |
| May | 17–25 | 23 | 4 | 45 | 11.3 | 45% | 16 | 279 | 7 | Quiet | 10 |
| Jun | 22–30 | 30 | 3 | 25 | 8.3 | 41% | 17 | 302 | 9 | Quiet | 9 |
| Jul | 26–34 | 33 | 1 | 12 | 12.0 | 33% | 20 | 314 | 9 | Quiet | 6 |
| Aug | 25–33 | 33 | 2 | 21 | 10.5 | 38% | 18 | 299 | 8 | Peak | 6 |
| Sep | 22–29 | 29 | 4 | 39 | 9.8 | 46% | 18 | 255 | 6 | Busy | 9 |
| Oct | 18–24 | 23 | 3 | 45 | 15.0 | 52% | 18 | 228 | 4 | Moderate | 10 |
| Nov | 14–19 | 18 | 6 | 67 | 11.2 | 61% | 20 | 182 | 3 | Peak | 9 |
| Dec | 11–16 | 14 | 9 | 100 | 11.1 | 68% | 20 | 169 | 2 | Moderate | 8 |
UV Index in Hydra by Month
UV index in Hydra peaks at 9 (very high) in July, dropping to 2 (low) in December. June, July, August reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.
Best months in detail
October
10/1018–24°C (feels 23°C) · 3 rain days (45h) · 228 sun hours · 52% humidity · Moderate crowd · UV 4 (moderate)
May
10/1017–25°C (feels 23°C) · 4 rain days (45h) · 279 sun hours · 45% humidity · Quiet crowd · UV 7 (high) · sunniest 1 in 10 days reach 8 (very high)
April
10/1013–20°C (feels 18°C) · 5 rain days (52h) · 248 sun hours · 48% humidity · Quiet crowd · UV 6 (moderate) · sunniest 1 in 10 days reach 7 (high)
Every month
Show the other 9 months in detail
January
8/109–14°C (feels 11°C) · 8 rain days (79h) · 175 sun hours · 63% humidity · Quiet crowd · UV 2 (low)
February
8/109–15°C (feels 12°C) · 5 rain days (67h) · 186 sun hours · 60% humidity · Quiet crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)
March
8/1010–16°C (feels 13°C) · 8 rain days (78h) · 223 sun hours · 55% humidity · Quiet crowd · UV 4 (moderate)
June
9/1022–30°C · 3 rain days (25h) · 302 sun hours · 41% humidity · Quiet crowd · UV 9 (very high)
July
6/1026–34°C · 1 rain days (12h) · 314 sun hours · 33% humidity · Quiet crowd · UV 9 (very high)
August
6/1025–33°C · 2 rain days (21h) · 299 sun hours · 38% humidity · Peak crowd · UV 8 (very high)
September
9/1022–29°C · 4 rain days (39h) · 255 sun hours · 46% humidity · Busy crowd · UV 6 (high)
November
9/1014–19°C (feels 18°C) · 6 rain days (67h) · 182 sun hours · 61% humidity · Peak crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)
December
8/1011–16°C (feels 14°C) · 9 rain days (100h) · 169 sun hours · 68% humidity · Moderate crowd · UV 2 (low)
Frequently asked questions about visiting Hydra
When is the best time to visit Hydra?
October is the highest-scoring month (10/10 on the Holiday Climate Index). Typical conditions: 18–24°C (3 rainy days). The top three months by score are October, May, April.
What is the worst time to visit Hydra?
July is the lowest-scoring month (6/10, capped by extreme heat). Typical conditions: 26–34°C (1 rainy day).
Is Hydra too hot in summer?
2 months (July, August) trip the heat deal-breaker in our scoring: apparent temperature crosses the comfort cap, so even with clear skies and low rain the score is held down. Plan around it if heat tolerance is low.
When are crowds lowest in Hydra?
Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in November. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.
Which months in Hydra have good weather but fewer tourists?
April (climate 10/10, crowd index 14) and May (climate 10/10, crowd index 16) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.
What is the UV index in Hydra by month?
UV peaks at 9 (very high) in July and is lowest in December at 2 (low). Monthly peak values: Jan 2, Feb 3, Mar 4, Apr 6, May 7, Jun 9, Jul 9, Aug 8, Sep 6, Oct 4, Nov 3, Dec 2. June, July, August reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.
What is the UV index in Hydra in July?
July is the peak UV month in Hydra, with a daily-peak UV index of 9 (very high). At this level, sunburn can occur in under 20 minutes on unprotected fair skin. Apply SPF 50+, wear protective clothing and a hat, and avoid direct midday sun (11:00–17:00).
How high can UV get in Hydra on the sunniest days?
Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. May is the worst case: typical days average UV 7 (high), but the top 10% of days reach UV 8 (very high) — and even higher. Months where the sunniest days routinely exceed the typical reading: February, April, May, November. Plan sun protection for the worst case, not the average.
Is air quality in Hydra bad for travelers?
PM2.5 (fine-particle pollution) exceeds the WHO sensitive-group guideline (15 µg/m³) in 1 month: July. The worst month is July with a typical-day mean of 10 µg/m³ (moderate); on the worst 10% of days PM2.5 reaches 16 µg/m³ (unhealthy for sensitive) and higher. People with asthma, heart conditions, or sensitive children may want to avoid these months or limit outdoor activity. Source: CAMS via Open-Meteo.