Verdict: Good month
Sintra Weather in December
December is mild-to-cool in Sintra, topping out near 15°C (59°F) — comfortable with a layer on. Expect showers on roughly 13 days of the month — rarely trip-ruining, worth planning around. Overall, December is a solid month to visit Sintra.
Average high
15°C / 59°F
Average low
10°C / 50°F
Rain days
~13
Precipitation
116 mm
What to pack for Sintra in December
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 13 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
December against the rest of the year
Warmest in Sintra: Jul (25°C / 77°F) · Coolest: Jan (14°C / 57°F) · Wettest: Dec (~13 rain days)
14°
8°
Jan
16°
9°
Feb
17°
10°
Mar
18°
11°
Apr
21°
13°
May
22°
15°
Jun
25°
16°
Jul
25°
17°
Aug
24°
16°
Sep
22°
15°
Oct
18°
12°
Nov
15°
10°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)