December brings 22°C daytime highs, 82mm of precipitation across about 9 wet days and 14.2 hours of daylight — best for hiking, cycling and reliable sunshine. The strongest run of the year is November to January. June is the quietest month: quiet and local, and still good for low-angle light and quiet and local.
Long-run climate normals for Blue Mountains. Month ratings compare months within Blue Mountains only — they are not a ranking of Blue Mountains against other destinations, and they are not a forecast for a specific year.
Last updated: · Live forecast data refreshes hourly.
| Best month | December — Hiking, Cycling, Reliable sunshine |
| Best 3-month window | November–January |
| Quietest month | June — Quiet and local |
| Driest month | August — 45mm |
| Wettest month | February — 108mm |
| Warmest / coolest | January 24°C / August 10°C |
| Seasonality | Fairly even across the year |
| Annual rainfall | 998mm over roughly 102 rain days |
June gets roughly 15% more precipitation than December — 94mm against 82mm. That difference, more than temperature, is what changes how a day here feels.
Daytime highs only move 14°C across the whole year (10–24°C), so timing matters far less here than rainfall does.
December gives you 14.2 hours of daylight against just 9.8 in June — a 4-hour difference in how much you can actually fit into a day.
August is the driest month at 45mm across roughly 5 wet days, while February peaks at 108mm.
November is almost as good as December, but usually quieter and cheaper. If your dates are flexible, it is the easier trip.
Blue Mountains stays fairly consistent all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Ratings compare months within Blue Mountains, not against destinations worldwide: five stars means the best time to be here, not that Blue Mountains beats anywhere else. Tags describe what the conditions actually suit.
| Month | Rating | High / Low | Precipitation | Wet days | Sun | Daylight | Best for |
|---|---|---|---|---|---|---|---|
| January | ★★★★☆ | 24°C / 14°C | 102mm | 11 | 7h | 14h | Hiking · Cycling |
| February | ★★★★☆ | 24°C / 14°C | 108mm | 12 | 7h | 13.2h | Hiking · Cycling |
| March | ★★★☆☆ | 22°C / 12°C | 98mm | 11 | 5h | 12.2h | Hiking · Cycling |
| April | ★★★☆☆ | 19°C / 10°C | 78mm | 9 | 4h | 11.1h | Hiking · Cycling · Autumn colour |
| May | ★★☆☆☆ | 15°C / 7°C | 72mm | 8 | 6h | 10.2h | Hiking · Cycling · Autumn colour |
| June | ★★☆☆☆ | 12°C / 5°C | 94mm | 10 | 5h | 9.8h | Low-angle light · Quiet and local |
| July | ★★☆☆☆ | 10°C / 3°C | 52mm | 6 | 3h | 10h | Low-angle light · Quiet and local |
| August | ★★☆☆☆ | 10°C / 3°C | 45mm | 5 | 5h | 10.8h | Low-angle light · Quiet and local |
| September | ★★★☆☆ | 12°C / 5°C | 45mm | 5 | 5h | 11.8h | Spring greenery |
| October | ★★★★☆ | 15°C / 7°C | 68mm | 8 | 9h | 12.9h | Hiking · Cycling · Reliable sunshine |
| November | ★★★★★ | 19°C / 10°C | 72mm | 8 | 10h | 13.8h | Hiking · Cycling · Reliable sunshine |
| December | ★★★★★ | 22°C / 12°C | 82mm | 9 | 11h | 14.2h | Hiking · Cycling · Reliable sunshine |
| You are planning | Pick | Why |
|---|---|---|
| Sun & beach days | December | 11h daily sunshine, 22°C highs and only 9 rain days. |
| City walking & sightseeing | December | 22°C highs with 14.2h of daylight — long days without heat fatigue. |
| Photography & light | December | 11h of sun and 14.2h daylight give the widest window for golden-hour work. |
| Value & fewer crowds | October | Scores 69/100 — close to peak conditions but outside the busiest window. |
| Cooler-weather travel | May | 15°C highs and 7°C nights suit anyone who dislikes heat. |
Each month in Blue Mountains is described from long-run climate normals and then rated relative to the other eleven months in the same city. A five-star January in a cold destination means January is one of the best times to be there — not that it beats a Mediterranean summer.
| Factor | Weight | What it measures |
|---|---|---|
| Temperature | Described | Average daytime high and overnight low for the month, shown as measured rather than judged. |
| Precipitation | Described | Monthly millimetres and wet-day count, labelled as snow or rain/snow where temperatures make that the likely phase. |
| Sunshine & daylight | Described | Average daily sunshine hours and astronomical daylight length at mid-month, from the city’s latitude. |
| “Best for” tags | Derived | Applied only when the conditions genuinely support the activity — snow depth-friendly cold for skiing, 13–24°C and low rain risk for hiking, dark evenings at high latitude for aurora. A month with few strong use cases gets fewer tags rather than padded ones. |
| Star rating | Relative | Ranks the month against the other eleven months in the same city. Never a comparison between cities. |
Figures are long-run climate averages, not a forecast for a specific year. Where a month lacks sourced rainfall or humidity, the value is modelled from temperature range and rain frequency.
December is the best all-round month in Blue Mountains: 22°C highs, 82mm of precipitation and 14.2 hours of daylight, which suits hiking, cycling and reliable sunshine. The strongest three-month window is November to January.
June — 12°C highs, 94mm of precipitation over roughly 10 days and 9.8 hours of daylight. It is the cheapest and least crowded time to go, and it still works for low-angle light and quiet and local.
August is the driest month at 45mm over about 5 rain days, against 108mm in February. Across the year Blue Mountains records around 998mm.
Yes — conditions in Blue Mountains stay fairly even all year, so there is no month you need to avoid. What you plan to do matters more than when you go.
Daylight ranges from 9.8 hours in June to 14.2 hours in December, calculated from the city's latitude.