Climate averages 1991–2020
Blue Mountains weather
by month.
See how the year changes. January has the highest average daily maximum; July has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Blue Mountains averages a daytime high of 16.9°C and a nighttime low of 7.1°C, with about 995 mm of rain on roughly 128 days. January is the warmest month (average high 23.6°C) and July the coolest (9.9°C). February is the wettest month with 148 mm; July is the driest with 37 mm.
The annual picture
A year in Blue Mountains
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Blue Mountains climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 23.6°C12.8°C | 12.8°C | 126 | 15.5 | 14.114 h |
| February | 22.2°C12.6°C | 12.6°C | 148 | 15.4 | 13.313 h |
| March | 19.9°C10.8°C | 10.8°C | 115 | 15.1 | 12.312 h |
| April | 16.8°C7.7°C | 7.7°C | 56 | 9.1 | 11.311 h |
| May | 13.3°C4.6°C | 4.6°C | 48 | 6.6 | 10.410 h |
| June | 10.4°C2.7°C | 2.7°C | 62 | 7.7 | 10.010 h |
| July | 9.9°C1.5°C | 1.5°C | 37 | 6.3 | 10.110 h |
| August | 11.5°C1.8°C | 1.8°C | 46 | 6.7 | 10.911 h |
| September | 15.0°C4.3°C | 4.3°C | 53 | 8.3 | 11.912 h |
| October | 18.0°C6.6°C | 6.6°C | 75 | 10.5 | 12.913 h |
| November | 20.1°C8.9°C | 8.9°C | 109 | 13.7 | 13.814 h |
| December | 22.1°C11.0°C | 11.0°C | 121 | 13.5 | 14.314 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- SydneyAustralia · 83 kmHigh 20.9°C · Low 14.4°C · 850 mm rain a year
- WollongongAustralia · 95 kmHigh 20.4°C · Low 14.9°C · 1,043 mm rain a year
- Central CoastAustralia · 101 kmHigh 21.1°C · Low 15.4°C · 864 mm rain a year
- MaitlandAustralia · 158 kmHigh 23.0°C · Low 13.7°C · 678 mm rain a year
- Newcastle, AustraliaAustralia · 160 kmHigh 21.3°C · Low 15.5°C · 961 mm rain a year
- CanberraAustralia · 206 kmHigh 18.2°C · Low 7.5°C · 551 mm rain a year
- TuggeranongAustralia · 222 kmHigh 18.2°C · Low 7.5°C · 740 mm rain a year
- Coffs HarbourAustralia · 462 kmHigh 22.4°C · Low 16.3°C · 1,214 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+10, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -33.70°, 150.30° (3 km from the city centre), adjusted down by 1.8°C for the difference between the city's elevation (978 m) and the cell's (706 m). Rain comes from the 0.25° cell at -33.75°, 150.25°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.