Sunbury has a warm temperate climate with warm summers and mild winters.
Temperatures peak in January and drop to their lowest in July, while rainfall is highest during autumn months.
Humidity remains moderate throughout the year creating cold and damp conditions.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | ☀️ | 28.0°C | 20.3°C | 12.6°C | 44.8°C | 4.7°C | 60% | 52 | 2.6 | 7.16 |
| February | ☀️ | 27.8°C | 20.3°C | 12.8°C | 43.5°C | 6.0°C | 61% | 40 | 2.5 | 6.38 |
| March | ☀️ | 24.9°C | 18.3°C | 11.6°C | 39.8°C | 4.5°C | 65% | 45 | 2.2 | 5.01 |
| April | 🌤️ | 20.2°C | 14.4°C | 8.7°C | 34.1°C | 1.4°C | 73% | 54 | 2.0 | 3.51 |
| May | 🌤️ | 15.7°C | 11.1°C | 6.5°C | 25.8°C | 0.3°C | 82% | 58 | 1.9 | 2.37 |
| June | 🌨️ | 12.1°C | 8.3°C | 4.5°C | 21.1°C | -2.2°C | 88% | 68 | 2.1 | 1.84 |
| July | 🌨️ | 11.3°C | 7.5°C | 3.7°C | 18.3°C | -2.6°C | 88% | 67 | 2.2 | 2.02 |
| August | 🌨️ | 12.7°C | 8.4°C | 4.0°C | 21.7°C | -1.9°C | 85% | 69 | 2.3 | 2.86 |
| September | 🌤️ | 15.3°C | 10.2°C | 5.1°C | 28.6°C | -1.1°C | 80% | 65 | 2.3 | 4.06 |
| October | 🌤️ | 18.5°C | 12.6°C | 6.7°C | 32.4°C | 0.6°C | 75% | 69 | 2.3 | 5.39 |
| November | ☀️ | 22.0°C | 15.5°C | 9.0°C | 40.0°C | 2.3°C | 70% | 68 | 2.4 | 6.38 |
| December | ☀️ | 25.2°C | 17.9°C | 10.6°C | 43.3°C | 3.6°C | 63% | 60 | 2.6 | 7.09 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Early mornings and evenings are most comfortable during this Hot Summer season.
☔ Rainfall is spread across the year with no sharply defined wet season.
Monthly averages · 1981–2025 climate normals · °C
Temperatures rise steadily from spring, peak in January, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Rainfall is concentrated in the autumn months. Humidity stays moderate (around 74%), peaking during summer months, which creates cold and damp conditions.
☔ Rainfall is spread across the year with no sharply defined wet season.
Monthly averages · 1981–2025
Across 45 years of records, Sunbury's temperature has remained relatively stable over the past decade. Its hottest day reached 44.8°C in January 1982, and its coldest dropped to -2.6°C in July 1982. 2019 was the warmest year overall and 1996 the coolest.
The warmest year in Sunbury's recorded history was 2019 (avg: 14.7°C), while the coldest was 1996 (avg: 12.4°C).
Average annual high/low · Last 30 years · °C
Total annual precipitation · Last 30 years · mm/year
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 20.7°C | 14.6°C | 8.6°C | 39.7°C | -0.2°C | 550 | 70% | 2.3 m/s |
2024 | 20.6°C | 14.6°C | 8.6°C | 38.5°C | 0.1°C | 670 | 73% | 2.2 m/s |
2023 | 20.0°C | 14.3°C | 8.6°C | 38.6°C | 0.3°C | 672 | 74% | 2.3 m/s |
2022 | 19.0°C | 13.8°C | 8.7°C | 37.5°C | -1.3°C | 890 | 79% | 2.2 m/s |
2021 | 18.9°C | 13.4°C | 7.8°C | 37.1°C | -0.1°C | 738 | 76% | 2.3 m/s |
2020 | 18.6°C | 13.2°C | 7.8°C | 41.5°C | 0.4°C | 932 | 78% | 2.3 m/s |
2019 🔥 | 21.0°C | 14.7°C | 8.4°C | 44.3°C | -0.3°C | 433 | 69% | 2.4 m/s |
2018 | 20.8°C | 14.6°C | 8.5°C | 41.4°C | -0.8°C | 515 | 70% | 2.4 m/s |
2017 | 20.5°C | 14.5°C | 8.5°C | 38.7°C | -1.9°C | 605 | 72% | 2.2 m/s |
2016 | 19.5°C | 14.0°C | 8.5°C | 41.8°C | -0.8°C | 719 | 75% | 2.4 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), January is typically the hottest month in Sunbury, Victoria, with average high temperatures around 28.0°C.
July is the coldest month in Sunbury, with average low temperatures around 3.7°C.
October receives the most rainfall with approximately 69 mm, while February is the driest with 40 mm.
The highest recorded temperature was 44.8°C in January 1982. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was -2.6°C in July 1982.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
Sunbury receives the most sunlight in January with an average solar radiation of 7.16 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Victoria.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
