Avg High
Darwin in September
Avg Low
Rain
Daylight
12h
What to expect
Darwin is in early spring during September, a shoulder-season stretch where conditions can nudge warmer or cooler week to week. Midday heat can feel intense, and a gentle drop-off once the sun goes down. Conditions tend to feel steady, which makes planning simple. You get a comfortable daylight window for day trips and sightseeing.
September in context
How it compares to the rest of the year in Darwin.
Hottest (avg)
#2 / 12
Wettest (avg)
#8 / 12
Daylight Hours
#7 / 12
Windiest (avg)
#10 / 12
Highest UV
#7 / 12
Most Humid
#8 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 12 h
- UV index (max)
- 9
- Typical sun hours
- 06:40 - 18:42
Rain & Snow
- Total rain
-
- Rainy days
- 8 days
- Cloud cover (avg)
- 41%
Humidity & Wind
- Humidity (avg)
- 66%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for September. Typical high 32.9°C and low 23.4°C.
Typical disruptions in September
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in September.
Heat High impact
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 94% of days (28.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
28.1 days / month
~94% of days
Why this matters
- Expected days 28.1 days / month
- Probability ~94% of days
- Intensity Up to ~39°C (P95)
Feels-like heat >=32C is possible on ~28 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Hot days Measures: Hot days (>=30C). Observed about 90% of days (26.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
26.9 days / month
~90% of days
Why this matters
- Expected days 26.9 days / month
- Probability ~90% of days
- Intensity Up to ~35°C (P95)
Hot days are possible on ~27 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Very hot feels-like Measures: Very hot feels-like days (>=35C). Observed about 68% of days (20.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
20.5 days / month
~68% of days
Why this matters
- Expected days 20.5 days / month
- Probability ~68% of days
- Intensity Up to ~39°C (P95)
Very hot feels-like conditions are possible on ~20 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat High impact
Heat stress risk Measures: High heat stress days. Observed about 60% of days (18.1 days/month) in September. Historical risk signal only, not a day-by-day forecast.
18.1 days / month
~60% of days
Why this matters
- Expected days 18.1 days / month
- Probability ~60% of days
- Intensity Up to ~39°C (P95)
Heat stress is possible on ~18 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Humidity High impact
Muggy days Measures: Muggy days (dew point >=20C). Observed about 52% of days (15.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
15.6 days / month
~52% of days
Why this matters
- Expected days 15.6 days / month
- Probability ~52% of days
- Intensity Up to ~24°C (P95)
Muggy conditions are possible on ~16 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat High impact
Very hot days Measures: Very hot days (>=35C). Observed about 2% of days (0.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.7 days / month
~2% of days
Why this matters
- Expected days 0.7 days / month
- Probability ~2% of days
- Intensity Up to ~36°C (P95)
Very hot days are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Show all disruptions (19 more)
Rain High impact
Washout risk Measures: Washout day risk. Observed about 2% of days (0.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
~2% of days
Why this matters
- Expected days 0.6 days / month
- Probability ~2% of days
- Intensity Up to ~16mm (P95)
Washout conditions are possible on ~1 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 ~15mm (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.
Heat Moderate
Heatwave run Measures: Heatwave runs (>=3 hot days). Observed about 1.3 days/month in September. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
Probability unavailable
Why this matters
- Expected days 1.3 days / month
- Probability —
- Intensity Up to ~34°C (P95)
Heatwave runs are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Moderate
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 1.3 days/month in September. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
Probability unavailable
Why this matters
- Expected days 1.3 days / month
- Probability —
- Intensity Up to ~37°C (P95)
Feels-like heatwave runs are possible on ~1 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 (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 ~18mm (P95)
Rain disruption risk appears on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). 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 ~22mm (P95)
Heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Moderate
Strong gusts Measures: Strong gust days (>=60 km/h). 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 ~61km/h (P95)
Strong gusts are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 78% of days (23.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
23.4 days / month
~78% of days
Why this matters
- Expected days 23.4 days / month
- Probability ~78% of days
- Intensity Up to ~26°C (P95)
Warm nights are possible on ~23 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 78% of days (23.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
23.3 days / month
~78% of days
Why this matters
- Expected days 23.3 days / month
- Probability ~78% of days
- Intensity Up to ~23°C (P95)
Humid conditions are possible on ~23 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 40% of days (11.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
11.9 days / month
~40% of days
Why this matters
- Expected days 11.9 days / month
- Probability ~40% of days
- Intensity Up to ~6.6mm (P95)
Measurable rain is possible on ~12 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 29% of days (8.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.
8.8 days / month
~29% of days
Why this matters
- Expected days 8.8 days / month
- Probability ~29% of days
- Intensity Up to ~58km/h (P95)
Gusty conditions are possible on ~9 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 23% of days (6.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
6.9 days / month
~23% of days
Why this matters
- Expected days 6.9 days / month
- Probability ~23% of days
- Intensity Up to ~96% (P95)
Cloudy skies are possible on ~7 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 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 ~13h (P95)
Several rainy hours are possible on ~6 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Heat Minor
Hot nights Measures: Hot nights (min >=25C). Observed about 12% of days (3.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
3.6 days / month
~12% of days
Why this matters
- Expected days 3.6 days / month
- Probability ~12% of days
- Intensity Up to ~26°C (P95)
Hot nights are possible on ~4 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 9% of days (2.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.7 days / month
~9% of days
Why this matters
- Expected days 2.7 days / month
- Probability ~9% of days
- Intensity Up to ~98% (P95)
Mostly cloudy skies are possible on ~3 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 7% of days (2.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.2 days / month
~7% of days
Why this matters
- Expected days 2.2 days / month
- Probability ~7% of days
- Intensity Up to ~14h (P95)
Wet-most-of-day conditions are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
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 ~24°C (P95)
Convective risk signal appears on ~1 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 2% of days (0.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
~2% of days
Why this matters
- Expected days 0.6 days / month
- Probability ~2% of days
- Intensity Up to ~87% (P95)
High humidity is possible on ~1 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
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.
Frequently asked questions
Is September a good time to visit Darwin?
Typical September days in Darwin reach highs of 33°C (91°F) with nights around 23°C (73°F). It usually feels very hot by day and warm after dark. Overall, September sits in the middle of the Darwin climate range.
What are temperatures like in September?
In September, you can usually expect highs of 33°C (91°F) and lows near 23°C (73°F). That means very hot days and warm nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 20 mm (0.79 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 06:40 and sunset near 18:42. 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 9 km/h (6 mph), with gusts on the windiest days reaching about 47 km/h (29 mph). On the ground, it is it often feels breezy, especially in more exposed spots or along the coast.