Avg High
Adelaide in December
Avg Low
Rain
Daylight
14h
What to expect
In Adelaide, December sits in early summer, with a clear seasonal rhythm running through the month. Most days feel warm without being relentless, with evenings that ease back comfortably. You get long daylight windows for full-day exploring. Comfort is usually predictable, so a standard day plan works well.
December in context
How it compares to the rest of the year in Adelaide.
Hottest (avg)
#3 / 12
Wettest (avg)
#9 / 12
Daylight Hours
#1 / 12
Windiest (avg)
#4 / 12
Highest UV
#1 / 12
Most Humid
#11 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 14.5 h
- UV index (max)
- 9
- Typical sun hours
- 05:57 - 20:24
Rain & Snow
- Total rain
-
- Rainy days
- 6 days
- Cloud cover (avg)
- 42%
Humidity & Wind
- Humidity (avg)
- 55%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for December. Typical high 26.0°C and low 14.4°C.
Typical disruptions in December
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in December.
Heat High impact
Hot days Measures: Hot days (>=30C). Observed about 22% of days (6.8 days/month) in December. Historical risk signal only, not a day-by-day forecast.
6.8 days / month
~22% of days
Why this matters
- Expected days 6.8 days / month
- Probability ~22% of days
- Intensity Up to ~38°C (P95)
Hot days are possible on ~7 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 7% of days (2.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
2.0 days / month
~7% of days
Why this matters
- Expected days 2.0 days / month
- Probability ~7% of days
- Intensity Up to ~80km/h (P95)
Strong gusts are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Heat High impact
Very hot days Measures: Very hot days (>=35C). Observed about 6% of days (1.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.9 days / month
~6% of days
Why this matters
- Expected days 1.9 days / month
- Probability ~6% of days
- Intensity Up to ~39°C (P95)
Very hot days are possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Very hot feels-like Measures: Very hot feels-like days (>=35C). Observed about 5% of days (1.7 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.7 days / month
~5% of days
Why this matters
- Expected days 1.7 days / month
- Probability ~5% of days
- Intensity Up to ~40°C (P95)
Very hot feels-like conditions are possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 4% of days (1.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.4 days / month
~4% of days
Why this matters
- Expected days 1.4 days / month
- Probability ~4% of days
- Intensity Up to ~27mm (P95)
Washout conditions are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Heat Moderate
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 14% of days (4.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
4.3 days / month
~14% of days
Why this matters
- Expected days 4.3 days / month
- Probability ~14% of days
- Intensity Up to ~39°C (P95)
Feels-like heat >=32C is possible on ~4 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Show all disruptions (20 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 2% of days (0.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~2% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~2% of days
- Intensity Up to ~30mm (P95)
Heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 1% of days (0.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~84km/h (P95)
Stormy conditions are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.3 days/month in December. Historical risk signal only, not a day-by-day forecast.
0.3 days / month
Probability unavailable
Why this matters
- Expected days 0.3 days / month
- Probability —
- Intensity Up to ~30mm (P95)
Multi-day washout runs are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Wind disruption Measures: Disruptive wind days. Observed about 1% of days (0.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~82km/h (P95)
Disruptive wind is possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 5% of days (1.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.5 days / month
~5% of days
Why this matters
- Expected days 1.5 days / month
- Probability ~5% of days
- Intensity Up to ~27mm (P95)
Rain disruption risk appears on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 53% of days (16.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
16.5 days / month
~53% of days
Why this matters
- Expected days 16.5 days / month
- Probability ~53% of days
- Intensity Up to ~67km/h (P95)
Gusty conditions are possible on ~17 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 31% of days (9.7 days/month) in December. Historical risk signal only, not a day-by-day forecast.
9.7 days / month
~31% of days
Why this matters
- Expected days 9.7 days / month
- Probability ~31% of days
- Intensity Up to ~99% (P95)
Cloudy skies are possible on ~10 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 28% of days (8.7 days/month) in December. Historical risk signal only, not a day-by-day forecast.
8.7 days / month
~28% of days
Why this matters
- Expected days 8.7 days / month
- Probability ~28% of days
- Intensity Up to ~11mm (P95)
Measurable rain is possible on ~9 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 18% of days (5.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
5.5 days / month
~18% of days
Why this matters
- Expected days 5.5 days / month
- Probability ~18% of days
- Intensity Up to ~16h (P95)
Several rainy hours are possible on ~6 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 12% of days (3.6 days/month) in December. Historical risk signal only, not a day-by-day forecast.
3.6 days / month
~12% of days
Why this matters
- Expected days 3.6 days / month
- Probability ~12% of days
- Intensity Up to ~100% (P95)
Mostly cloudy skies are possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 10% of days (3.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
3.0 days / month
~10% of days
Why this matters
- Expected days 3.0 days / month
- Probability ~10% of days
- Intensity Up to ~18h (P95)
Wet-most-of-day conditions are possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 8% of days (2.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
2.5 days / month
~8% of days
Why this matters
- Expected days 2.5 days / month
- Probability ~8% of days
- Intensity Up to ~36km/h (P95)
Breezy conditions are possible on ~3 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 5% of days (1.6 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.6 days / month
~5% of days
Why this matters
- Expected days 1.6 days / month
- Probability ~5% of days
- Intensity Up to ~26°C (P95)
Warm nights are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 4% of days (1.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.1 days / month
~4% of days
Why this matters
- Expected days 1.1 days / month
- Probability ~4% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Heatwave run Measures: Heatwave runs (>=3 hot days). Observed about 0.8 days/month in December. Historical risk signal only, not a day-by-day forecast.
0.8 days / month
Probability unavailable
Why this matters
- Expected days 0.8 days / month
- Probability —
- Intensity Up to ~38°C (P95)
Heatwave runs are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 2% of days (0.6 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
~2% of days
Why this matters
- Expected days 0.6 days / month
- Probability ~2% of days
- Intensity Up to ~87% (P95)
High humidity is possible on ~1 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Heat Minor
Hot nights Measures: Hot nights (min >=25C). Observed about 2% of days (0.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~2% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~2% of days
- Intensity Up to ~28°C (P95)
Hot nights are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.5 days/month in December. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
Probability unavailable
Why this matters
- Expected days 0.5 days / month
- Probability —
- Intensity Up to ~40°C (P95)
Feels-like heatwave runs are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Wind Minor
Windy days Measures: Windy days (mean wind >=35 km/h). Observed about 1% of days (0.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~37km/h (P95)
Strong mean winds are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 1% of days (0.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~20°C (P95)
Humid conditions are possible on ~0 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Frequently asked questions
Is December a good time to visit Adelaide?
Typical December days in Adelaide reach highs of 26°C (79°F) with nights around 15°C (59°F). It usually feels warm by day and mild after dark. Overall, December sits in the middle of the Adelaide climate range.
What are temperatures like in December?
Daytime temperatures in December typically peak near 26°C (79°F), while nights drop to around 15°C (59°F). Expect warm afternoons and mild evenings.
How much does it rain in December?
Rainfall in December averages 24 mm (0.94 in) across roughly 6 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in December?
You can expect about 14 hours of daylight in December. Sunrise is typically around 05:57 and sunset near 20:24. You get long days with comfortable amounts of daylight.
How strong is the sun in December?
UV levels frequently reach very high levels (around 9), so strong sun protection is essential, especially around midday.
Is it windy in December?
In December, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 56 km/h (35 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.