Darwin weather in September
In September, Darwin sees average daytime highs of 34°C and overnight lows near 22°C, with 16 mm of rain across 3.8 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.
Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 47% of the time in September, and the air most often feels muggy.
Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Darwin's 5th-clearest and 10th-windiest month. For the whole year in context, see Darwin's year-round climate.
- Daytime high
- 34°
- 2nd warmest
- Overnight low
- 22°
- 4th coldest
- Rainfall
- 16 mm
- 3.8 wet days
- Daylight
- 11 h 54 min
- 6:43 AM – 6:39 PM
- Cloud cover
- 43%
- 5th clearest
- Wind
- 8 km/h
- 10th windiest
- Solar energy
- 6.56 kWh/m²
- Travel score
- 3.6
- out of 10
Darwin is capital city of the Northern Territory, Australia, and the surrounding area.
- Air quality
- Good
- PM2.5 9.1 µg/m³ · 2019
- Density
- 3,443/km²
- people per km²
- Founded
- 1869
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 34°C through the month.
A typical September day in Darwin reaches about 34°C in the afternoon and slips back to 22°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 36°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 |
| Avg low (°C) | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 20 |
| 2 | 33 | 20 |
| 3 | 34 | 21 |
| 4 | 34 | 21 |
| 5 | 34 | 21 |
| 6 | 34 | 21 |
| 7 | 34 | 21 |
| 8 | 34 | 21 |
| 9 | 34 | 21 |
| 10 | 34 | 21 |
| 11 | 34 | 21 |
| 12 | 34 | 22 |
| 13 | 34 | 22 |
| 14 | 34 | 22 |
| 15 | 34 | 22 |
| 16 | 34 | 22 |
| 17 | 34 | 22 |
| 18 | 34 | 22 |
| 19 | 34 | 22 |
| 20 | 34 | 22 |
| 21 | 34 | 22 |
| 22 | 34 | 23 |
| 23 | 34 | 23 |
| 24 | 34 | 23 |
| 25 | 34 | 23 |
| 26 | 34 | 23 |
| 27 | 34 | 23 |
| 28 | 34 | 23 |
| 29 | 34 | 23 |
| 30 | 34 | 23 |
How September really feels in Darwin
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Darwin weather by month
How September compares with the rest of the year at a glance. September is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 26° | 438 | 27.6 | 12.7 | 2.6 |
| Feb | 31° / 26° | 376 | 25.6 | 12.4 | 2.6 |
| Mar | 32° / 25° | 300 | 24.4 | 12.1 | 2.7 |
| Apr | 33° / 24° | 100 | 10.1 | 11.7 | 3.4 |
| May | 33° / 22° | 14 | 2.4 | 11.4 | 4.2 |
| Jun | 32° / 20° | 2 | 0.4 | 11.3 | 5.2 |
| Jul | 32° / 19° | 1 | 0.3 | 11.3 | 5.3 |
| Aug | 33° / 19° | 2 | 0.5 | 11.6 | 4.7 |
| Sep | 34° / 22° | 16 | 3.8 | 11.9 | 3.6 |
| Oct | 34° / 24° | 76 | 11.2 | 12.3 | 3.0 |
| Nov | 33° / 25° | 180 | 20.8 | 12.6 | 2.6 |
| Dec | 32° / 26° | 323 | 24.9 | 12.7 | 2.6 |
Cloud cover in September
The sky is clear or mostly clear about 47% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 25% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 75 | 75 | 75 | 75 | 75 | 74 | 74 | 73 | 73 | 72 | 72 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 71 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 72 |
| Cloudier (%) | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 27 | 27 | 28 | 28 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 75 | 25 |
| 2 | 75 | 25 |
| 3 | 75 | 25 |
| 4 | 75 | 25 |
| 5 | 75 | 25 |
| 6 | 74 | 26 |
| 7 | 74 | 26 |
| 8 | 73 | 27 |
| 9 | 73 | 27 |
| 10 | 72 | 28 |
| 11 | 72 | 28 |
| 12 | 71 | 29 |
| 13 | 71 | 29 |
| 14 | 71 | 29 |
| 15 | 71 | 29 |
| 16 | 70 | 30 |
| 17 | 70 | 30 |
| 18 | 70 | 30 |
| 19 | 71 | 29 |
| 20 | 70 | 30 |
| 21 | 70 | 30 |
| 22 | 71 | 29 |
| 23 | 71 | 29 |
| 24 | 71 | 29 |
| 25 | 71 | 29 |
| 26 | 71 | 29 |
| 27 | 71 | 29 |
| 28 | 71 | 29 |
| 29 | 71 | 29 |
| 30 | 72 | 28 |
Chance of precipitation in September
Darwin gets around 16 mm of rain over 3.8 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 13% and peaks near 22% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 16 | 17 | 17 | 18 | 19 | 20 | 20 | 21 | 22 |
| Rain chance (%) | |
|---|---|
| 1 | 5 |
| 2 | 6 |
| 3 | 6 |
| 4 | 7 |
| 5 | 7 |
| 6 | 8 |
| 7 | 8 |
| 8 | 9 |
| 9 | 9 |
| 10 | 10 |
| 11 | 10 |
| 12 | 11 |
| 13 | 11 |
| 14 | 12 |
| 15 | 13 |
| 16 | 13 |
| 17 | 14 |
| 18 | 14 |
| 19 | 15 |
| 20 | 15 |
| 21 | 16 |
| 22 | 16 |
| 23 | 17 |
| 24 | 17 |
| 25 | 18 |
| 26 | 19 |
| 27 | 20 |
| 28 | 20 |
| 29 | 21 |
| 30 | 22 |
Humidity in September
Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the muggy band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 70% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 13 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 11 | 11 | 10 | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 |
| Humid (%) | 26 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 21 | 21 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 16 | 16 | 15 | 14 | 14 | 13 | 12 | 11 | 11 | 10 | 10 |
| Muggy (%) | 38 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 41 | 41 | 42 | 42 | 43 | 43 | 44 | 44 | 44 | 43 | 42 | 42 | 40 | 39 | 38 |
| Oppressive (%) | 12 | 13 | 14 | 16 | 17 | 18 | 19 | 21 | 22 | 23 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 36 | 37 | 39 | 41 | 43 | 45 | 47 | 48 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 13 | 11 | 26 | 38 | 12 | 0 |
| 2 | 12 | 11 | 25 | 39 | 13 | 0 |
| 3 | 11 | 10 | 24 | 40 | 14 | 0 |
| 4 | 11 | 10 | 24 | 40 | 16 | 0 |
| 5 | 10 | 9 | 23 | 40 | 17 | 0 |
| 6 | 10 | 9 | 23 | 40 | 18 | 0 |
| 7 | 9 | 9 | 22 | 40 | 19 | 0 |
| 8 | 9 | 9 | 22 | 40 | 21 | 0 |
| 9 | 9 | 8 | 21 | 40 | 22 | 0 |
| 10 | 8 | 8 | 21 | 40 | 23 | 0 |
| 11 | 8 | 8 | 20 | 40 | 23 | 0 |
| 12 | 8 | 8 | 20 | 40 | 24 | 0 |
| 13 | 7 | 7 | 20 | 40 | 25 | 0 |
| 14 | 7 | 7 | 20 | 40 | 26 | 1 |
| 15 | 6 | 7 | 19 | 40 | 27 | 1 |
| 16 | 6 | 6 | 19 | 41 | 28 | 1 |
| 17 | 5 | 6 | 18 | 41 | 29 | 1 |
| 18 | 4 | 5 | 18 | 42 | 30 | 1 |
| 19 | 4 | 5 | 17 | 42 | 31 | 1 |
| 20 | 3 | 4 | 16 | 43 | 32 | 1 |
| 21 | 2 | 4 | 16 | 43 | 33 | 2 |
| 22 | 2 | 4 | 15 | 44 | 34 | 2 |
| 23 | 1 | 3 | 14 | 44 | 36 | 2 |
| 24 | 1 | 3 | 14 | 44 | 37 | 2 |
| 25 | 1 | 2 | 13 | 43 | 39 | 2 |
| 26 | 0 | 2 | 12 | 42 | 41 | 2 |
| 27 | 0 | 2 | 11 | 42 | 43 | 2 |
| 28 | 0 | 1 | 11 | 40 | 45 | 2 |
| 29 | 0 | 1 | 10 | 39 | 47 | 3 |
| 30 | 0 | 1 | 10 | 38 | 48 | 3 |
Wind in September
Winds average 8 km/h in September.
Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 8 | calm |
| 3 | 8 | calm |
| 4 | 8 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over September. Sunrise moves from 6:54 AM to 6:33 AM, and sunset from 6:39 PM to 6:39 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 |
| Sunrise (AM) | 6:54 | 6:53 | 6:52 | 6:52 | 6:51 | 6:50 | 6:49 | 6:49 | 6:48 | 6:47 | 6:47 | 6:46 | 6:45 | 6:44 | 6:44 | 6:43 | 6:42 | 6:42 | 6:41 | 6:40 | 6:39 | 6:39 | 6:38 | 6:37 | 6:36 | 6:36 | 6:35 | 6:34 | 6:34 | 6:33 |
| Sunset (PM) | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 | 6:39 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 6:54 | 6:39 |
| 2 | 11.8 | 6:53 | 6:39 |
| 3 | 11.8 | 6:52 | 6:39 |
| 4 | 11.8 | 6:52 | 6:39 |
| 5 | 11.8 | 6:51 | 6:39 |
| 6 | 11.8 | 6:50 | 6:39 |
| 7 | 11.8 | 6:49 | 6:39 |
| 8 | 11.8 | 6:49 | 6:39 |
| 9 | 11.8 | 6:48 | 6:39 |
| 10 | 11.9 | 6:47 | 6:39 |
| 11 | 11.9 | 6:47 | 6:39 |
| 12 | 11.9 | 6:46 | 6:39 |
| 13 | 11.9 | 6:45 | 6:39 |
| 14 | 11.9 | 6:44 | 6:39 |
| 15 | 11.9 | 6:44 | 6:39 |
| 16 | 11.9 | 6:43 | 6:39 |
| 17 | 11.9 | 6:42 | 6:39 |
| 18 | 12.0 | 6:42 | 6:39 |
| 19 | 12.0 | 6:41 | 6:39 |
| 20 | 12.0 | 6:40 | 6:39 |
| 21 | 12.0 | 6:39 | 6:39 |
| 22 | 12.0 | 6:39 | 6:39 |
| 23 | 12.0 | 6:38 | 6:39 |
| 24 | 12.0 | 6:37 | 6:39 |
| 25 | 12.0 | 6:36 | 6:39 |
| 26 | 12.1 | 6:36 | 6:39 |
| 27 | 12.1 | 6:35 | 6:39 |
| 28 | 12.1 | 6:34 | 6:39 |
| 29 | 12.1 | 6:34 | 6:39 |
| 30 | 12.1 | 6:33 | 6:39 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.56 kWh/m².
For context, solar energy here swings from a low near 5.21 kWh/m² to a high of 6.81 kWh/m² in October across the year — September's 6.56 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.3 | 6.4 | 6.4 | 6.4 | 6.4 | 6.4 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.3 | Intense |
| 2 | 6.4 | Intense |
| 3 | 6.4 | Intense |
| 4 | 6.4 | Intense |
| 5 | 6.4 | Intense |
| 6 | 6.4 | Intense |
| 7 | 6.5 | Intense |
| 8 | 6.5 | Intense |
| 9 | 6.5 | Intense |
| 10 | 6.5 | Intense |
| 11 | 6.5 | Intense |
| 12 | 6.5 | Intense |
| 13 | 6.5 | Intense |
| 14 | 6.6 | Intense |
| 15 | 6.6 | Intense |
| 16 | 6.6 | Intense |
| 17 | 6.6 | Intense |
| 18 | 6.6 | Intense |
| 19 | 6.6 | Intense |
| 20 | 6.6 | Intense |
| 21 | 6.6 | Intense |
| 22 | 6.6 | Intense |
| 23 | 6.7 | Intense |
| 24 | 6.7 | Intense |
| 25 | 6.7 | Intense |
| 26 | 6.7 | Intense |
| 27 | 6.7 | Intense |
| 28 | 6.7 | Intense |
| 29 | 6.7 | Intense |
| 30 | 6.7 | Intense |
Hazard calendar for Darwin
None of Darwin's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Darwin sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Darwin's monsoon runs December–March, when most of the year's rain falls.
Is September a good time to visit Darwin?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Darwin. The water and warmth also suit a beach or pool day.
What to pack for Darwin in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Darwin sees daytime highs around 34°C and nights near 22°C. Pack light clothes and sun protection. About 4 days see rain.
Sea temperature near Darwin in September
The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in December at about 31°C and coldest in July near 26°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 30 | 30 | 30 | 30 | 29 | 27 | 26 | 26 | 28 | 30 | 31 | 31 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 30 | Tropical |
| Feb | 30 | Tropical |
| Mar | 30 | Tropical |
| Apr | 30 | Tropical |
| May | 29 | Tropical |
| Jun | 27 | Warm |
| Jul | 26 | Warm |
| Aug | 26 | Warm |
| Sep | 28 | Warm |
| Oct | 30 | Tropical |
| Nov | 31 | Tropical |
| Dec | 31 | Tropical |
UV index in Darwin in September
Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Darwin peaks around February 20 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 9 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 16 | 16 | 13 | 10 | 9 | 9 | 11 | 13 | 14 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 16 | Extreme |
| Mar | 16 | Extreme |
| Apr | 13 | Extreme |
| May | 10 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 11 | Extreme |
| Sep | 13 | Extreme |
| Oct | 14 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in Darwin in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Darwin is worst in June — around 17 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (March, 5 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Darwin's WHO annual average of 9.1 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 6 | 5 | 6 | 14 | 17 | 12 | 14 | 9 | 7 | 7 | 6 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 6 | Good |
| Mar | 5 | Good |
| Apr | 6 | Good |
| May | 14 | Moderate |
| Jun | 17 | Moderate |
| Jul | 12 | Moderate |
| Aug | 14 | Moderate |
| Sep | 9 | Good |
| Oct | 7 | Good |
| Nov | 7 | Good |
| Dec | 6 | Good |
Where is Darwin?
Darwin sits at 12.5°S, 130.8°E, 31 m above sea level, in Australia. The nearest listed city is Palmerston, 16 km away.
Topography around Darwin
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Darwin.
Within 3 km, the terrain around Darwin has only modest variations in elevation — a maximum elevation change of 40 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 51 m; within 80 km, only modest variations in elevation — a maximum elevation change of 227 m.
The land around Darwin is covered by water (62%) within 3 km, water (46%) and trees (24%) within 16 km, and water (44%) and trees (38%) within 80 km.
Australia travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type I
- 230 V · 50 Hz
- Prices
- ≈ 90% of US
- price level, 2025
- GDP per capita
- $65,130
- 2025
- Happiness
- 6.9 / 10
- World Happiness, 2025
- Homicide rate
- 0.9
- per 100k, 2023
- Road deaths
- 4.9
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Darwin (-12.4611°, 130.8418°, elevation 31 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).