Glenbrook Weather in December
What's the weather like in Glenbrook (New South Wales) in December 2025?
The climate in Glenbrook during December can be summarized as warm and a little damp.
December is in the summer in Glenbrook and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 14°C (58°F) is normal.
| Daytime temperature | 27.7°C 81.8°F |
|---|---|
| Nightly temperature | 14.4°C 57.8°F |
| Average temperature | 21°C 69.8°F |
| Daily sunshine | 8.5 hrs |
| Avg rainfall | 88 mm 3.5 ins |
| Rainy days | 10 days |
| Sea temperature | 22.2°C 72°F |
| Humidity | 55% |
| Windspeed | 13kph 8 mph |
On average December is the 5th wettest month of the year in Glenbrook with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.5 hours of sunshine per day.
December temperatures in Glenbrook
December rainfall
December hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Glenbrook in December 2025.
Other monthly averages
Best places to visit in December
Glenbrook weather stats
| Hottest month: | January | 27.9°C 82.2°F |
|---|---|---|
| Driest month: | September | 46mm 1.8ins |
| Sunniest month: | August | 7.7hrs |
| Coldest month: | July | 15.8°C 60.4°F |
| Wettest month: | February | 149mm 5.9ins |
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