Sea Temperature in Portstewart in December

Complete information on the sea temperature range in the Irish Sea in Portstewart in December. Historical daily data. Climate details for December. Tips on swimming conditions and beach relaxation in Portstewart. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature Range in Portstewart in December

9°C

MINIMUN

11°C

AVERAGE

13°C

MAXIMUM

Historical Data of Water Temperature in December in Portstewart

Water Temperature Chart for Irish Sea in Portstewart in December

Sea Temperature Table in Portstewart in December Over the Past Years

Day	2024	2023	2022	Average
Dec 1	11°C	12°C	12°C	11.5°C
Dec 2	12°C	12°C	12°C	12.0°C
Dec 3	12°C	12°C	12°C	11.8°C
Dec 4	11°C	12°C	12°C	11.5°C
Dec 5	11°C	12°C	12°C	11.5°C
Dec 6	11°C	12°C	12°C	11.5°C
Dec 7	11°C	11°C	12°C	11.0°C
Dec 8	11°C	11°C	11°C	11.3°C
Dec 9	11°C	11°C	11°C	11.0°C
Dec 10	11°C	11°C	12°C	11.3°C
Dec 11	11°C	11°C	12°C	11.0°C
Dec 12	11°C	11°C	11°C	11.0°C
Dec 13	11°C	11°C	11°C	11.0°C
Dec 14	10°C	11°C	11°C	10.8°C
Dec 15	10°C	10°C	11°C	10.3°C
Dec 16	10°C	10°C	11°C	10.3°C
Dec 17	10°C	11°C	11°C	10.8°C
Dec 18	10°C	10°C	11°C	10.3°C
Dec 19	10°C	11°C	11°C	10.5°C
Dec 20	11°C	10°C	11°C	10.5°C
Dec 21	11°C	10°C	11°C	10.5°C
Dec 22	10°C	10°C	11°C	10.3°C
Dec 23	9°C	10°C	11°C	10.0°C
Dec 24	9°C	10°C	10°C	9.8°C
Dec 25	9°C	10°C	10°C	9.8°C
Dec 26	9°C	11°C	10°C	10.0°C
Dec 27	9°C	11°C	10°C	10.0°C
Dec 28	9°C	11°C	10°C	10.0°C
Dec 29	9°C	11°C	10°C	10.0°C
Dec 30	9°C	10°C	10°C	9.8°C

Portstewart Climate and Swimming Opportunities in December

8°C

Average Day Air Temperature

3°C

Average Night Air Temperature

121 mm

Precipitation Amount per Month

18 days

Number of Rainy Days

7 hrs

Daylight
per Day

1 hrs

Sunshine
per Day

20 km/h

Average Wind Speed

91%

Average
humidity

Portstewart lies within the Northen Ireland in United Kingdom. The average daytime temperature in Portstewart in December is 8°C (46°F), while the nighttime average is 3°C (37°F). There are typically 18 rainy days during the month, with a total precipitation of 121 mm (4.8 inches). The daylight duration in December in Portstewart is 7 hours, with an average of 1 hours of sunshine per day. The average wind speed in December is 20 km/h (12 mph), and the humidity level is around 91%.

The water temperature in Portstewart in December ranges from 9°C to 12°C (48°F to 54°F). At the beginning of the month, the average temperature is around 12°C (54°F), shifting to 11°C (52°F) by mid-December and reaching 10°C (50°F) in the last ten days. Overall, the average sea temperature in Portstewart for December is 11°C (52°F). The water is still cold, but for short swims, it can be manageable. Warm clothes are necessary after swimming.

Sea Temperature in December in Nearby Cities

Frequently Asked Questions About Water Temperatures in December in Portstewart

What is the sea temperature in Portstewart in December?

The water temperature in the Irish Sea in Portstewart in December ranges from 9°C to 12°C (48°F to 54°F).

Is it possible to swim in the Irish Sea in Portstewart in December?

The average sea temperature in Portstewart in December is 11°C (52°F), and the air temperature is 8°C (46°F), so the water is still cold, but for short swims, it can be manageable. Warm clothes are necessary after swimming.