Croatia
Istria in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Istria in December is climatically mixed. The average daily high is around 9 °C, and the sea is about 14 °C. With about 11 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
30/100 · #11
Warmth
#10
Dryness
#8
Sun
#12
Sea warmth
#8
Published best categories: none
Istria · DecemberPhoto: Einaz80 · CC BY-SA 4.0Climate facts
- Average high
- 9 °C
- Average low
- 5 °C
- Sea
- 14 °C
- Rainy days (est.)
- 11 rainy days (est.)
- Sun (est.)
- 1 h/day
- Humidity
- 82 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 13 | 9 | 13 | 131 | 1.8 | 81 | 3.8 | 17 | 36 |
| December (selected) | 9 | 5 | 11 | 100 | 1.4 | 82 | 3.9 | 14 | 30 |
| January | 8 | 4 | 10 | 72 | 1.7 | 82 | 3.8 | 12 | 30 |
How do the previous and next months compare?
Baseline: December (30/100)
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 | +6 | +3.9 °C | +3.7 °C | +1.9 | +31.3 mm | +0.4 h | -0.5 % | ±0 m/s | +2.8 °C |
| January | ±0 | -1.5 °C | -1.4 °C | -1.2 | -27.6 mm | +0.3 h | ±0 % | ±0 m/s | -2.1 °C |
All twelve months in context
Find a place to stay
Where to stay in Istria
Compare available stays, prices and cancellation terms for Istria on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Frequently asked questions
How warm is Istria in December?
The average daily high is around 9 °C, with an average daily low of about 5 °C.
Can you swim in Istria in December?
The sea is about 14 °C (cold).
Does it rain a lot in Istria in December?
The curated estimate is about 11 rainy days per month, not a directly measured long-term average. Total precipitation averages around 100 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Istria?
By the climate score, June, July, August and September are the strongest months for Istria. For a beach trip: June, July, August and September. December is not among them.