Ireland
Dublin in January: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Dublin in January is climatically mixed. The average daily high is around 8 °C, and the sea is about 9 °C. With about 17 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
15/100 · #11
Warmth
#12
Dryness
#9
Sun
#11
Sea warmth
#9
Published best categories: none
Dublin · JanuaryPhoto: Holger Uwe Schmitt · CC BY-SA 4.0Climate facts
- Average high
- 8 °C
- Average low
- 4 °C
- Sea
- 9 °C
- Rainy days (est.)
- 17 rainy days (est.)
- Sun (est.)
- 1 h/day
- Humidity
- 91 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| December | 8 | 5 | 18 | 102 | 0.7 | 91 | 5.6 | 11 | 14 |
| January (selected) | 8 | 4 | 17 | 87 | 0.9 | 91 | 5.6 | 9 | 15 |
| February | 8 | 4 | 15 | 71 | 1.7 | 90 | 5.5 | 8 | 19 |
How do the previous and next months compare?
Baseline: January (15/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| December | -1 | +0.7 °C | +0.9 °C | +1.6 | +14.7 mm | -0.2 h | +0.3 % | -0.1 m/s | +1.5 °C |
| February | +4 | +0.3 °C | -0.1 °C | -1.9 | -16.2 mm | +0.8 h | -1 % | -0.1 m/s | -1 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Dublin in January?
The average daily high is around 8 °C, with an average daily low of about 4 °C.
Can you swim in Dublin in January?
The sea is about 9 °C (cold).
Does it rain a lot in Dublin in January?
The curated estimate is about 17 rainy days per month, not a directly measured long-term average. Total precipitation averages around 87 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Dublin?
No month in Dublin reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.