Perth weather in December
December in Perth: hot, dry, with clean air — an excellent time to visit.
#5 of 12 months in Perth · #35 of 604 destinations to visit in December · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Perth climate normals — December
| Daytime high | 31°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 65°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 2 mm / 0.1 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 48% | 🍃 comfortable |
| Dew point | 11°C / 51°F | |
| Sunshine | 13.1 h/day | |
| Daylight | 14.2 h | |
| Wind | 29 km/h / 18 mph | |
| Air quality (US AQI) | 27 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Perth in December — FAQ
- Is December a good time to visit Perth?
- December in Perth: hot, dry, with clean air — an excellent time to visit. It ranks #5 of 12 months for Perth on SeasonMap's comfort score (89/100).
- What is the weather like in Perth in December?
- In December, Perth averages a daily high of 30.8°C and a low of 18.5°C, with about 2.2 mm of rain over roughly 0.8 rainy days.
- What is the air quality in Perth in December?
- Perth has a mean US Air Quality Index of about 27 in December.