Cairns in September
In September, Cairns averages 26°C (80°F) during the day and 20°C (67°F) at night, with frequent rain — about 16 days of the month see precipitation (33 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
September offers comfortable temperatures in Cairns, with some rain to plan around.
How September compares to the rest of the year in Cairns
September is in the middle of the year for warmth in Cairns (8th of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 1°C below the annual average (28°C). September runs 2°C warmer than August (25°C) and warms a further 2°C into October (28°C).
September sunrise & sunset in Cairns
Times shown for Cairns local time (Australia/Brisbane), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Cairns — September
Golden-hour and blue-hour windows for the 15th of September, in Cairns's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Cairns in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Cairns's popularity.
Crowds & pricing — September in Cairns
Cairns is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — September in Cairns
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Cairns — September
Across the year Cairns's sea swings from 23.3°C (August) to 30.1°C (January) — September sits at 24.6°C.
Cairns in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 30°C / 86°F | 24°C / 76°F | 375 mm | 28 | — |
| February | 30°C / 87°F | 25°C / 76°F | 293 mm | 24 | — |
| March | 29°C / 85°F | 24°C / 75°F | 293 mm | 25 | — |
| April | 28°C / 82°F | 23°C / 73°F | 199 mm | 25 | — |
| May | 26°C / 79°F | 21°C / 70°F | 81 mm | 19 | — |
| June | 25°C / 76°F | 19°C / 67°F | 63 mm | 19 | — |
| July | 24°C / 75°F | 18°C / 65°F | 42 mm | 15 | — |
| August | 25°C / 77°F | 18°C / 65°F | 32 mm | 13 | — |
| September | 26°C / 80°F | 20°C / 67°F | 33 mm | 16 | — |
| October | 28°C / 83°F | 21°C / 70°F | 47 mm | 16 | — |
| November | 30°C / 85°F | 23°C / 73°F | 55 mm | 21 | — |
| December | 30°C / 86°F | 24°C / 75°F | 259 mm | 22 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Cairns in September →
Frequently asked questions
How hot is Cairns in September?
In September, Cairns averages a high of 26°C (80°F) and a low of 20°C (67°F) — generally warm.
Does it rain a lot in Cairns in September?
September is quite rainy in Cairns, with about 16 rainy days on average.
Is September a good time to visit Cairns?
September is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Cairns in September?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full September packing list for Cairns for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.