Weather in Gawler in December

A good month. December is a solid month to be in Gawler. Highs average 30.6 °C, lows 14.6 °C, and rain falls on 4 days — nothing in the month is working against you.

December ranks 7 of 12 in Gawler: past the worst of the year but short of October, which is the month to book if the dates are open.

Rain falls on only 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 30.6 °C days and 14.6 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 8 days clear 35 °C, so a serious heatwave is normal rather than notable; the day swings 16 °C from low to high, which means one bag has to cover both. Across the twenty years measured, the hottest December day reached 47.7 °C and the coldest night fell to 7.5 °C, and the wettest single day dropped 35 mm — roughly 146% of the month's rain in one day.

This is the volatile part. December rainfall has ranged from 0 mm to 103 mm across the twenty years measured — a 103 mm spread around an average of 24 mm. The average is real but almost no individual December looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 12 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 48%.

How December sits in the year

The month is on the way up: 2.3 °C warmer than November, and January adds another 3 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in December

December is at or near the longest days of Gawler's year: 14.4 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

With no coast nearby, the year swings a fair way — 27.4 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. Within December itself the daily swing is 16 °C, so mornings and afternoons need different clothes.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Gawler versus nearby

If Gawler is one option among several, the nearby comparison is worth making. Adelaide is a better bet in December — 2.7 °C cooler, the same number of rain days. Whyalla is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: December works, with October the better month by 16 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Gawler

See all twelve months in Gawler, or where else to go in December.