Portugal

Porto in December: weather, sea & travel advice

This month's data profile

Rain shapes the decision

Porto in December is climatically mixed. The average daily high is around 14 °C, and the sea is about 14 °C. With about 14 rainy days it is wet.

Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.

Rank among 12 monthly averages

33/100 · #11

Warmth

#10

Dryness

#11

Sun

#12

Sea warmth

Published best categories: none

Ribeira waterfront on the Douro in Porto

Porto · DecemberPhoto: Ken & Nyetta · CC BY 2.0

Average high: 14 °C
Average low: 9 °C
Sea: 14 °C
Rainy days (est.): 14 rainy days (est.)
Sun (est.): 2 h/day
Humidity: 85 %

Climate evidence with direct month comparison

The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.

Climate averages for Porto: selected and adjacent months
Month	Avg high °C	Avg low °C	Rainy days (est.)	Precipitation mm	Sun h/day (est.)	Humidity %	Wind m/s	Sea °C	Score
November	16	11	14	142	2.6	83	2.5	16	40
December (selected)	14	9	14	134	2.0	85	2.5	14	33
January	13	8	13	131	2.3	85	2.5	14	33

How do the previous and next months compare?

Baseline: December (33/100)

Positive and negative values show the change from the selected month.

	Score Δ	Average high Δ	Average low Δ	Rainy days Δ	Rain Δ	Sun Δ	Humidity Δ	Wind Δ	Sea Δ
November	+7	+2.1 °C	+2 °C	+0.1	+8 mm	+0.6 h	-1.8 %	-0.1 m/s	+1.3 °C
January	±0	-0.8 °C	-1 °C	-1	-3.3 mm	+0.3 h	-0.6 %	±0 m/s	-0.7 °C

All twelve months in context

JanUnsuitable33 FebUnsuitable41 MarLimited47 AprLimited51 MayLimited61 JunGood78 JulExcellent82 AugExcellent83 SepGood77 OctLimited57 NovUnsuitable40 DecUnsuitable33

Rainy days (estimated)

Sunshine hours (estimated)h/day

Average daily high°C

Sea temperature°C

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Useful next decisions

Porto · Month by month

Mykonos · December Elba · December Puglia · December Menorca · December

Frequently asked questions

How warm is Porto in December?

The average daily high is around 14 °C, with an average daily low of about 9 °C.

Can you swim in Porto in December?

The sea is about 14 °C (cold).

Does it rain a lot in Porto in December?

The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 134 mm for the month. A rainy day does not mean all-day rain.

When is the best time to visit Porto?

By the climate score, June, July, August and September are the strongest months for Porto. For a beach trip: June, July, August and September. December is not among them.