Avg High
Cairns in September
Avg Low
Rain
Daylight
12h
What to expect
In Cairns, September sits in early spring, a shoulder-season month where the feel can shift as the season turns. Most days feel warm without being relentless, and relatively steady temperatures through the day. Comfort is usually predictable, so a standard day plan works well. Daylight is moderate, so steady pacing works well.
September in context
How it compares to the rest of the year in Cairns.
Hottest (avg)
#9 / 12
Wettest (avg)
#12 / 12
Daylight Hours
#7 / 12
Windiest (avg)
#6 / 12
Highest UV
#7 / 12
Most Humid
#12 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 12 h
- UV index (max)
- 9
- Typical sun hours
- 06:11 - 18:11
Rain & Snow
- Total rain
-
- Rainy days
- 8 days
- Cloud cover (avg)
- 46%
Humidity & Wind
- Humidity (avg)
- 75%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for September. Typical high 25.9°C and low 19.6°C.
Typical disruptions in September
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in September.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 8% of days (2.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.4 days / month
~8% of days
Why this matters
- Expected days 2.4 days / month
- Probability ~8% of days
- Intensity Up to ~76km/h (P95)
Strong gusts are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 3% of days (1.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.0 days / month
~3% of days
Why this matters
- Expected days 1.0 days / month
- Probability ~3% of days
- Intensity Up to ~21mm (P95)
Washout conditions are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Humidity Moderate
Muggy days Measures: Muggy days (dew point >=20C). Observed about 15% of days (4.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
4.5 days / month
~15% of days
Why this matters
- Expected days 4.5 days / month
- Probability ~15% of days
- Intensity Up to ~23°C (P95)
Muggy conditions are possible on ~5 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Moderate
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 6% of days (1.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.9 days / month
~6% of days
Why this matters
- Expected days 1.9 days / month
- Probability ~6% of days
- Intensity Up to ~35°C (P95)
Feels-like heat >=32C is possible on ~2 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 3% of days (1.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.0 days / month
~3% of days
Why this matters
- Expected days 1.0 days / month
- Probability ~3% of days
- Intensity Up to ~21mm (P95)
Rain disruption risk appears on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Show all disruptions (17 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~44mm (P95)
Heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.2 days/month in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
Probability unavailable
Why this matters
- Expected days 0.2 days / month
- Probability —
- Intensity Up to ~22mm (P95)
Multi-day washout runs are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 50% of days (14.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
14.9 days / month
~50% of days
Why this matters
- Expected days 14.9 days / month
- Probability ~50% of days
- Intensity Up to ~66km/h (P95)
Gusty conditions are possible on ~15 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 48% of days (14.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
14.3 days / month
~48% of days
Why this matters
- Expected days 14.3 days / month
- Probability ~48% of days
- Intensity Up to ~22°C (P95)
Humid conditions are possible on ~14 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 39% of days (11.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
11.6 days / month
~39% of days
Why this matters
- Expected days 11.6 days / month
- Probability ~39% of days
- Intensity Up to ~6.8mm (P95)
Measurable rain is possible on ~12 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 34% of days (10.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
10.1 days / month
~34% of days
Why this matters
- Expected days 10.1 days / month
- Probability ~34% of days
- Intensity Up to ~89% (P95)
High humidity is possible on ~10 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 30% of days (8.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
8.9 days / month
~30% of days
Why this matters
- Expected days 8.9 days / month
- Probability ~30% of days
- Intensity Up to ~94% (P95)
Cloudy skies are possible on ~9 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 28% of days (8.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
8.4 days / month
~28% of days
Why this matters
- Expected days 8.4 days / month
- Probability ~28% of days
- Intensity Up to ~21h (P95)
Several rainy hours are possible on ~8 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 18% of days (5.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
5.5 days / month
~18% of days
Why this matters
- Expected days 5.5 days / month
- Probability ~18% of days
- Intensity Up to ~23h (P95)
Wet-most-of-day conditions are possible on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 8% of days (2.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.4 days / month
~8% of days
Why this matters
- Expected days 2.4 days / month
- Probability ~8% of days
- Intensity Up to ~98% (P95)
Mostly cloudy skies are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 6% of days (1.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.8 days / month
~6% of days
Why this matters
- Expected days 1.8 days / month
- Probability ~6% of days
- Intensity Up to ~24°C (P95)
Warm nights are possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
Convective risk Measures: Convective storm risk proxy. Observed about 3% of days (0.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.9 days / month
~3% of days
Why this matters
- Expected days 0.9 days / month
- Probability ~3% of days
- Intensity Up to ~23°C (P95)
Convective risk signal appears on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 2% of days (0.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~2% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~2% of days
- Intensity Up to ~99% (P95)
Overcast skies are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Hot days Measures: Hot days (>=30C). Observed about 1% of days (0.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.3 days / month
~1% of days
Why this matters
- Expected days 0.3 days / month
- Probability ~1% of days
- Intensity Up to ~31°C (P95)
Hot days are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Very hot feels-like Measures: Very hot feels-like days (>=35C). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~36°C (P95)
Very hot feels-like conditions are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Heat stress risk Measures: High heat stress days. Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~36°C (P95)
Heat stress is possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.2 days/month in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
Probability unavailable
Why this matters
- Expected days 0.2 days / month
- Probability —
- Intensity Up to ~35°C (P95)
Feels-like heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Frequently asked questions
Is September a good time to visit Cairns?
Typical September days in Cairns reach highs of 25°C (77°F) with nights around 21°C (70°F). It usually feels warm by day and mild after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in September?
In September, you can usually expect highs of 25°C (77°F) and lows near 21°C (70°F). That means warm days and mild nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 23 mm (0.91 in) across roughly 8 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in September?
You can expect about 12 hours of daylight in September. Sunrise is typically around 06:11 and sunset near 18:11. Daylight is fairly typical, with enough time for sightseeing.
How strong is the sun in September?
UV levels frequently reach very high levels (around 9), so strong sun protection is essential, especially around midday.
Is it windy in September?
In September, average wind speeds are around 12 km/h (7 mph), with gusts on the windiest days reaching about 70 km/h (43 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.