When to go · Isle of Portland
Isle of Portland in December
Avoid month. Listed as a month to avoid: Nov–Feb (wind, rain, many closures).
Key facts
- Verdict
- Avoid
- Temperature
- 10°C (49°F)49°F (10°C) / 6°C (43°F)43°F (6°C)
- average high / low
- Rain days
- 14
- Crowds
- Medium
- United Kingdom overall
- Prices
- High
- United Kingdom overall
Verdict
Listed as a month to avoid: Nov–Feb (wind, rain, many closures).
Is another month better than December?
December is rated avoid. These months rate higher:
Weather in December
- Isle of PortlandHighs around 9.6 °C (49 °F), lows around 6 °C (43 °F), rain on about 14 daysHighs around 49 °F (9.6 °C), lows around 43 °F (6 °C), rain on about 14 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Christmas Day and Boxing Day (substitute 28 Dec) big impact
25–28 Dec 2026 · United Kingdom
No trains or Tube on Christmas Day; reduced service on Boxing Day; most shops and sights closed on the 25th.
Crowds and prices
- Crowds · United Kingdom overall
- Medium
- Prices · United Kingdom overall
- High
United Kingdom overall: Christmas markets and shows; transport stops on the 25th and hotels spike around New Year.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in Isle of Portland, side by side.
Verdict
Dec: Avoid
May: Great (better)
Daytime high
Dec: 9.6 °C (49 °F)49 °F (9.6 °C)
May: 14.5 °C (58 °F)58 °F (14.5 °C)
Night low
Dec: 6 °C (43 °F)43 °F (6 °C)
May: 9.5 °C (49 °F)49 °F (9.5 °C)
Rain days
Dec: 14
May: 9 (better)
Crowds
Dec: Medium
May: Medium
Prices
Dec: High
May: Medium
Festivals listed
Dec: 1
May: 0
December: Listed as a month to avoid: Nov–Feb (wind, rain, many closures).
May: Inside Isle of Portland's best window: May–Sep.
Isle of Portland: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings
- A rain jacket or umbrella and shoes that dry fast