Geelong in December
December is right in the heart of summer for Geelong, and the weather has a definite personality this time of year.
Daytime highs average 25.7 degrees, dropping to 13.4 degrees overnight. That's a 12-degree swing between day and night. That's solidly pleasant territory. Great for being outdoors.
At 25.7 degrees, December runs 5.7 degrees above Geelong's annual average of 20.0 degrees.
You're looking at 34mm of rain across 7 days in a typical December. Nothing dramatic.
Sunshine-wise, December delivers around 25.3 MJ/m2 of daily solar radiation. UV sits in the extreme category. Sunscreen, hat, and sunnies are all essential. You can burn in under 10 minutes.
December earns a 9.7/10 on our Comfort Score. This is prime time.
Packing tip: bring a mix of short and long sleeves, something warmer for mornings and evenings, and serious sun protection.
The full data breakdown is below. You can also see how other Australian cities compare in December.
December at a Glance
Temperature Range
Daily temperature range in December. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- Comfortable casual wear suitable for warm days
- A light rain jacket just in case
- Strong sun protection including a hat and SPF 50+
Coming From Overseas?
How December in Geelong stacks up against major cities around the world.
About 18 degrees warmer and considerably drier.
About 20 degrees warmer and considerably drier.
About 14 degrees warmer and considerably drier.
How December Compares
Geelong's monthly climate at a glance. December is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 24.2 | 14.7 | 49mm | 10.0 |
| Feb | 26.4 | 13.9 | 1mm | 9.8 |
| Mar | 25.3 | 13.2 | 16mm | 9.9 |
| Apr | 18.3 | 10.0 | 66mm | 5.4 |
| May | 16.8 | 8.6 | 36mm | 4.4 |
| Jun | 13.6 | 6.3 | 16mm | 2.2 |
| Jul | 12.8 | 6.2 | 56mm | 1.0 |
| Aug | 17.1 | 7.8 | 38mm | 4.7 |
| Sep | 16.7 | 8.6 | 43mm | 4.6 |
| Oct | 19.5 | 9.4 | 63mm | 7.2 |
| Nov | 23.2 | 12.0 | 84mm | 9.8 |
| Dec | 25.7 | 13.4 | 34mm | 9.7 |