January in Alonnisos — off-season conditions
Hardest · 4.9/10Expect 10°C (50°F) in January. A good month for city streets, viewpoints and long meals; leave swimming for another season.
Budget for roughly 95 mm of rain this month — a flexible day or two helps — with about 23 days with 6+ hours of sunshine and 9.8 hours of daylight to work around it.
That is 4.9/10 on the same scale — 11th of 12 months, versus 10/10 for the best month here.
Budget for low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, June is materially better in Alonnisos — 5.1 points higher on the same scale.
February in Alonnisos: mixed conditions, plan around the weather
Trade-offs · 5.4/10Expect 10°C (50°F) in February. A good month for city streets, viewpoints and long meals; leave swimming for another season.
Budget for roughly 65 mm of rain this month — a flexible day or two helps — with about 21 days with 6+ hours of sunshine and 10.7 hours of daylight to work around it.
That is 5.4/10 on the same scale — 9th of 12 months, versus 10/10 for the best month here.
Expect low-season pricing, and crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
If your dates are flexible, June is materially better in Alonnisos — 4.6 points higher on the same scale.
March in Alonnisos — workable with trade-offs
Trade-offs · 5.5/10March averages 11°C (52°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 70 mm, so plan one flexible day in three; you still get about 26 days with 6+ hours of sunshine and 12 hours of daylight.
It scores 5.5/10 here, 8th of 12 months, against 10/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer.
Flexible dates? June scores 4.5 points higher here — enough to change the trip.
April in Alonnisos — middling scores, decent value
Trade-offs · 6/10Temperatures hover around 14°C (57°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 49 mm of rain this month — a flexible day or two helps — with about 28 days with 6+ hours of sunshine and 13.3 hours of daylight to work around it.
That is 6/10 on the same scale — 7th of 12 months, versus 10/10 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 Alonnisos — 4 points higher on the same scale.
May in Alonnisos — reliably good (5th best month)
Good · 7.5/10May averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Expect 40 mm of rain — occasional showers rather than washed-out days — alongside about 30 days with 6+ hours of sunshine and 14.3 daylight hours.
It scores 7.5/10 here, 5th of 12 months, against 10/10 in the destination's best month.
Figure on 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 2.5 points higher here — enough to change the trip.
June in Alonnisos — the year's strongest window
Best window · 10/10With 24°C (74°F) on average, June delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
With around 20 mm of rain, any showers tend to pass through rather than settle in; about 30 days with 6+ hours of sunshine and 14.9 hours of daylight fill the rest.
On our climate-comfort scale this is the top-ranked month of the year for Alonnisos at 10/10 — the reference point every other month on this page is measured against.
Budget for peak pricing, and 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 Alonnisos — one of the best windows
Best window · 10/10Days in July average 27°C (80°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
With around 32 mm of rain, any showers tend to pass through rather than settle in; about 31 days with 6+ hours of sunshine and 14.6 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Alonnisos at 10/10 (2nd of 12), just behind June at 10/10.
Expect 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.
August in Alonnisos — one of the year's strongest windows (3rd)
Best window · 10/10August averages 26°C (79°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rain is a non-issue at 15 mm for the month, with about 31 days with 6+ hours of sunshine and 13.7 hours of daylight to work with.
A 10/10 puts this among the year's best months in Alonnisos (3rd of 12); only June scores higher, at 10/10.
Plan for 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 the lightest breathable clothing you own, a hat, and more water than feels necessary.
September ranks 4th of 12 for Alonnisos — one of the best windows
Best window · 8.6/10September averages 22°C (72°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 86 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 12.4 hours of daylight.
A 8.6/10 puts this among the year's best months in Alonnisos (4th of 12); only June scores higher, at 10/10.
Plan for mid-season pricing, with crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
October in Alonnisos — reliably good (6th best month)
Good · 7.4/10Temperatures hover around 18°C (65°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 27 days with 6+ hours of sunshine and 11.2 hours of daylight fill the rest.
That is 7.4/10 on the same scale — 6th of 12 months, versus 10/10 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 Alonnisos — 2.6 points higher on the same scale.
November in Alonnisos — middling scores, decent value
Trade-offs · 5.3/10Temperatures hover around 15°C (59°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 77 mm of rain this month — a flexible day or two helps — with about 24 days with 6+ hours of sunshine and 10 hours of daylight to work around it.
That is 5.3/10 on the same scale — 10th of 12 months, versus 10/10 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 Alonnisos — 4.7 points higher on the same scale.
December in Alonnisos — the hardest end of the year
Hardest · 4.7/10December averages 12°C (53°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Monthly rainfall reaches 106 mm — wet for this destination — but about 22 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 4.7/10 here, 12th of 12 months, against 10/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
Flexible dates? June scores 5.3 points higher here — enough to change the trip.
