December · Greece
Best time to visit Syros in December Weather, crowds & prices
Weather in Syros in December
Average temperature 16°C, 109 mm of rain, about 0 days with 6+ hours of sunshine and 78% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
5.9/10
Ranked #12 of 12 months
- Avg temp
- 16°C
- Rainfall
- 109 mm
- Humidity
- 78%
- Days with 6h+ sun
- 0
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
December in Syros scores 5.9/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 16°C, 109 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Syros is a Cycladic island whose capital, Ermoupoli, is a marble-built neoclassical port city of arcades.
December in Syros — workable with trade-offs
Temperatures hover around 16°C (61°F) — the kind of month where neither heat nor cold forces the schedule.
109 mm of rain signals a properly wet month, with only almost no days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.9/10 on the same scale — 12th of 12 months, versus 9.6/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, April is materially better in Syros — 3.7 points higher on the same scale.
Frequently asked
- What is the weather like in Syros in December?
- In December, Syros averages 16°C, 109 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 5.9/10.
- Is December a good time to visit Syros?
- December earns a 5.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Syros in December?
- Expect about 109 mm of rain in December. Average humidity is 78% and there are about 0 days with 6+ hours of sunshine.
Curated in Syros
Tickets & experiences
Things to do in Syros
Syros, Greece. Live activities and tours from GetYourGuide, matched to this destination.