Sydney Weather: December
 |
Average Day Temperature: | 34.6°F |
|
Average Night Temperature: | 31.4°F |
|
Sea Water Temperature: | 39.0°F |
|
Number of Sunny Days: | 3 days |
| Sunshine Hours: | 8.6 - 8.9 hours | |
|
Number of Rainy Days: | 6 days |
| Precipitation Totals: | 3.2 in | |
|
Number of Snowy Days: | 1 day |
| detailed information | ||
forecast
| Sydney |
Temperature
| Sydney |
Air Temperature in December, °F
The highest day temperature in December 2025 was 49°F. The lowest night temperature was 16°F. The average values for day and night temperatures during December were 31.4°F и 27.3°F respectivly.
Sydney Water Sea Temperature in December, °F
The average sea surface temperature in December 2025 for Sydney was 38.0°F. The maximum and minimum values were 34.4°F and 43.2°F respectively.
Most of the days in December are gloomy but you can also expect sunny days.
Precipitation Totals in December, in
Precipitation total in December for Sydney is 3.2 in. It makes december one of the most rainy months of the year.
The average wind speed in December is 12.4 mph. It makes December the most windy month of the year for Sydney.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Sydney in December is 2.6 hours.
Sydney on the Weather Map
| Halifax |  |
+40 |
| Kingston |  |
+42 |
| Moncton | |
+40 |
| Montreal | |
+46 |
| Niagara Falls | |
+52 |
| Ottawa | |
+44 |
| Prince Edward Island | |
+38 |
| Quebec | |
+36 |
| Saint John |  |
+36 |
| St. John's | |
+32 |
| Sydney | |
+34 |
| Toronto | |
+52 |
| Vancouver | |
+34 |
| Victoria | |
+34 |
| Winnipeg | |
-12 |
| 0300 |  |
34°F | NE 17 mph |
| 0600 | |
36°F | NE 16 mph |
| 0900 | |
36°F | NE 10 mph |
| 1200 |  |
46°F | E 8 mph |
| 1500 | |
50°F | SE 6 mph |
| 1800 |  |
42°F | SW 6 mph |
| 2100 | |
34°F | SW 6 mph |
| 0000 | |
32°F | SW 4 mph |