January in Ios: expect compromises
Hardest · 2.3/10January averages 15°C (58°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 78 mm, so plan one flexible day in three; you still get about 1 days with 6+ hours of sunshine and 9.8 hours of daylight.
It scores 2.3/10 here, 12th of 12 months, against 9.8/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? June scores 7.5 points higher here — enough to change the trip.
February in Ios: expect compromises
Hardest · 3.7/10February averages 14°C (58°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 51 mm, so plan one flexible day in three; you still get about 7 days with 6+ hours of sunshine and 10.6 hours of daylight.
It scores 3.7/10 here, 10th of 12 months, against 9.8/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Flexible dates? June scores 6.1 points higher here — enough to change the trip.
March in Ios — workable with trade-offs
Trade-offs · 5.5/10Temperatures hover around 15°C (58°F) — the kind of month where neither heat nor cold forces the schedule.
With around 43 mm of rain, any showers tend to pass through rather than settle in; about 18 days with 6+ hours of sunshine and 11.7 hours of daylight fill the rest.
That is 5.5/10 on the same scale — 8th of 12 months, versus 9.8/10 for the best month here.
Expect mid-season pricing, and crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening.
If your dates are flexible, June is materially better in Ios — 4.3 points higher on the same scale.
April in Ios — reliably good (7th best month)
Good · 7.2/10April averages 17°C (63°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 20 mm of rain — occasional showers rather than washed-out days — alongside about 27 days with 6+ hours of sunshine and 12.9 daylight hours.
It scores 7.2/10 here, 7th of 12 months, against 9.8/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack layers you can shed by midday plus one warm layer for the evening.
Flexible dates? June scores 2.6 points higher here — enough to change the trip.
May holds up well in Ios — 6th best month
Good · 8.2/10With 19°C (67°F) on average, May delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
With around 18 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 14 hours of daylight fill the rest.
That is 8.2/10 on the same scale — 6th of 12 months, versus 9.8/10 for the best month here.
Budget for mid-season pricing, and crowds are moderate.
Pack light clothing, swimwear and real sun protection.
If your dates are flexible, June is materially better in Ios — 1.6 points higher on the same scale.
June: the best month of the year in Ios
Best window · 9.8/10June averages 24°C (75°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 11 mm for the month, with about 30 days with 6+ hours of sunshine and 14.5 hours of daylight to work with.
On our climate-comfort scale this is the top-ranked month of the year for Ios at 9.8/10 — the reference point every other month on this page is measured against.
Plan for peak pricing, with crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack light clothing, swimwear and real sun protection.
July ranks 2nd of 12 for Ios — one of the best windows
Best window · 9.8/10July averages 26°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 3 mm for the month, with about 31 days with 6+ hours of sunshine and 14.3 hours of daylight to work with.
A 9.8/10 puts this among the year's best months in Ios (2nd of 12); only June scores higher, at 9.8/10.
Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack light clothing, swimwear and real sun protection.
August ranks 3rd of 12 for Ios — one of the best windows
Best window · 9.8/10Days in August average 26°C (79°F) and humidity near 76% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
At just 6 mm for the month, rain will not shape your plans; you get about 31 days with 6+ hours of sunshine and 13.4 hours of daylight.
On our climate-comfort scale this is one of the strongest months of the year for Ios at 9.8/10 (3rd of 12), just behind June at 9.8/10.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
September is one of the strongest months in Ios (4th)
Best window · 9.8/10With 25°C (77°F) on average, September delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
At just 15 mm for the month, rain will not shape your plans; you get about 25 days with 6+ hours of sunshine and 12.2 hours of daylight.
On our climate-comfort scale this is one of the strongest months of the year for Ios at 9.8/10 (4th of 12), just behind June at 9.8/10.
Expect peak pricing, and crowds are moderate.
Pack light clothing, swimwear and real sun protection.
October in Ios — reliably good (5th best month)
Good · 8.3/10October averages 22°C (71°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 9 mm for the month, with about 15 days with 6+ hours of sunshine and 11 hours of daylight to work with.
It scores 8.3/10 here, 5th of 12 months, against 9.8/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack light clothing, swimwear and real sun protection.
Flexible dates? June scores 1.5 points higher here — enough to change the trip.
November in Ios: mixed conditions, plan around the weather
Trade-offs · 5.1/10November averages 19°C (66°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 51 mm, so plan one flexible day in three; you still get about 4 days with 6+ hours of sunshine and 10 hours of daylight.
It scores 5.1/10 here, 9th of 12 months, against 9.8/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Flexible dates? June scores 4.7 points higher here — enough to change the trip.
December in Ios — the hardest end of the year
Hardest · 3/10Temperatures hover around 17°C (62°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 83 mm of rain this month — a flexible day or two helps — with about 1 days with 6+ hours of sunshine and 9.5 hours of daylight to work around it.
That is 3/10 on the same scale — 11th of 12 months, versus 9.8/10 for the best month here.
Expect low-season pricing, and crowds are light for this destination.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
If your dates are flexible, June is materially better in Ios — 6.8 points higher on the same scale.
