Karratha weather in December
In December, Karratha sees average daytime highs of 31°C and overnight lows near 26°C, with 20 mm of rain across 1.2 wet days and about 13.2 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.
Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 83% of the time in December, and the air most often feels oppressive.
Daylight stretches from about 13 h 12 min at the start of December to 13 h 12 min by month's end. Set against the rest of the year, December is Karratha's 6th-clearest and 2nd-windiest month. For the whole year in context, see Karratha's year-round climate.
- Daytime high
- 31°
- 4th warmest
- Overnight low
- 26°
- 9th coldest
- Rainfall
- 20 mm
- 1.2 wet days
- Daylight
- 13 h 18 min
- 5:31 AM – 6:46 PM
- Cloud cover
- 19%
- 6th clearest
- Wind
- 21 km/h
- 2nd windiest
- Solar energy
- 7.94 kWh/m²
- Travel score
- 5.8
- out of 10
Karratha is town in Western Australia.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 31°C through the month.
A typical December day in Karratha reaches about 31°C in the afternoon and slips back to 26°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°C. Set against its neighbours, December runs about 1°C warmer than November and on par with January.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| Avg low (°C) | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 31 | 26 |
| 2 | 31 | 26 |
| 3 | 31 | 26 |
| 4 | 31 | 26 |
| 5 | 31 | 26 |
| 6 | 31 | 26 |
| 7 | 31 | 26 |
| 8 | 31 | 26 |
| 9 | 31 | 26 |
| 10 | 31 | 26 |
| 11 | 31 | 26 |
| 12 | 31 | 26 |
| 13 | 31 | 26 |
| 14 | 31 | 26 |
| 15 | 31 | 26 |
| 16 | 31 | 26 |
| 17 | 31 | 26 |
| 18 | 31 | 27 |
| 19 | 31 | 27 |
| 20 | 31 | 27 |
| 21 | 31 | 27 |
| 22 | 31 | 27 |
| 23 | 31 | 27 |
| 24 | 31 | 27 |
| 25 | 32 | 27 |
| 26 | 32 | 27 |
| 27 | 32 | 27 |
| 28 | 32 | 27 |
| 29 | 32 | 27 |
| 30 | 32 | 27 |
| 31 | 32 | 27 |
How December really feels in Karratha
Once humidity and wind are folded in, December averages 31 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 December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Karratha weather by month
How December compares with the rest of the year at a glance. December is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 32° / 27° | 45 | 3.9 | 13.1 | 5.0 |
| Feb | 32° / 28° | 81 | 4.9 | 12.7 | 4.8 |
| Mar | 32° / 28° | 68 | 3.4 | 12.1 | 4.8 |
| Apr | 31° / 26° | 25 | 1.7 | 11.5 | 5.8 |
| May | 28° / 22° | 25 | 2.6 | 11 | 7.8 |
| Jun | 25° / 19° | 31 | 2.7 | 10.8 | 8.7 |
| Jul | 24° / 18° | 12 | 1.3 | 10.9 | 9.3 |
| Aug | 25° / 19° | 3 | 0.5 | 11.3 | 9.5 |
| Sep | 27° / 20° | 2 | 0.2 | 11.9 | 9.1 |
| Oct | 29° / 23° | 1 | 0.2 | 12.5 | 7.7 |
| Nov | 30° / 25° | 1 | 0.2 | 13 | 6.8 |
| Dec | 31° / 26° | 20 | 1.2 | 13.2 | 5.8 |
Cloud cover in December
The sky is clear or mostly clear about 83% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 6% of December, with mostly cloudy or overcast conditions the remaining 11%. 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 94 | 94 | 94 | 93 | 93 | 91 | 91 | 90 | 90 | 89 | 89 | 88 | 88 | 88 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 |
| Cloudier (%) | 6 | 6 | 6 | 7 | 7 | 9 | 9 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 94 | 6 |
| 2 | 94 | 6 |
| 3 | 94 | 6 |
| 4 | 93 | 7 |
| 5 | 93 | 7 |
| 6 | 91 | 9 |
| 7 | 91 | 9 |
| 8 | 90 | 10 |
| 9 | 90 | 10 |
| 10 | 89 | 11 |
| 11 | 89 | 11 |
| 12 | 88 | 12 |
| 13 | 88 | 12 |
| 14 | 88 | 12 |
| 15 | 87 | 13 |
| 16 | 87 | 13 |
| 17 | 87 | 13 |
| 18 | 87 | 13 |
| 19 | 87 | 13 |
| 20 | 87 | 13 |
| 21 | 87 | 13 |
| 22 | 87 | 13 |
| 23 | 87 | 13 |
| 24 | 87 | 13 |
| 25 | 87 | 13 |
| 26 | 87 | 13 |
| 27 | 87 | 13 |
| 28 | 87 | 13 |
| 29 | 87 | 13 |
| 30 | 87 | 13 |
| 31 | 87 | 13 |
Chance of precipitation in December
Karratha gets around 20 mm of rain over 1.2 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 4% and peaks near 6% on the wettest days.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 6 | 6 |
| Rain chance (%) | |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 2 |
| 6 | 3 |
| 7 | 3 |
| 8 | 3 |
| 9 | 3 |
| 10 | 4 |
| 11 | 4 |
| 12 | 4 |
| 13 | 4 |
| 14 | 4 |
| 15 | 4 |
| 16 | 4 |
| 17 | 4 |
| 18 | 4 |
| 19 | 4 |
| 20 | 4 |
| 21 | 4 |
| 22 | 4 |
| 23 | 4 |
| 24 | 4 |
| 25 | 4 |
| 26 | 5 |
| 27 | 5 |
| 28 | 5 |
| 29 | 5 |
| 30 | 6 |
| 31 | 6 |
Humidity in December
Most of December feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the oppressive band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 80% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Humid (%) | 29 | 27 | 26 | 25 | 24 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 16 | 15 | 14 | 14 | 13 | 13 | 12 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 7 |
| Muggy (%) | 38 | 39 | 39 | 39 | 39 | 38 | 38 | 37 | 37 | 36 | 35 | 34 | 33 | 33 | 32 | 31 | 30 | 30 | 29 | 29 | 28 | 28 | 28 | 27 | 26 | 26 | 25 | 24 | 24 | 23 | 22 |
| Oppressive (%) | 20 | 22 | 23 | 25 | 26 | 28 | 30 | 32 | 33 | 35 | 36 | 37 | 39 | 40 | 41 | 41 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 44 | 45 | 45 | 46 |
| Miserable (%) | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 5 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 23 | 24 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 10 | 29 | 38 | 20 | 2 |
| 2 | 1 | 10 | 27 | 39 | 22 | 2 |
| 3 | 1 | 9 | 26 | 39 | 23 | 2 |
| 4 | 1 | 9 | 25 | 39 | 25 | 2 |
| 5 | 1 | 8 | 24 | 39 | 26 | 3 |
| 6 | 1 | 8 | 22 | 38 | 28 | 3 |
| 7 | 1 | 7 | 21 | 38 | 30 | 3 |
| 8 | 1 | 6 | 20 | 37 | 32 | 4 |
| 9 | 1 | 6 | 19 | 37 | 33 | 5 |
| 10 | 1 | 5 | 18 | 36 | 35 | 5 |
| 11 | 1 | 5 | 17 | 35 | 36 | 6 |
| 12 | 1 | 5 | 16 | 34 | 37 | 6 |
| 13 | 1 | 4 | 16 | 33 | 39 | 7 |
| 14 | 1 | 4 | 15 | 33 | 40 | 8 |
| 15 | 0 | 4 | 14 | 32 | 41 | 9 |
| 16 | 0 | 4 | 14 | 31 | 41 | 10 |
| 17 | 0 | 3 | 13 | 30 | 42 | 11 |
| 18 | 0 | 3 | 13 | 30 | 42 | 12 |
| 19 | 0 | 3 | 12 | 29 | 43 | 13 |
| 20 | 0 | 3 | 12 | 29 | 43 | 14 |
| 21 | 0 | 2 | 11 | 28 | 43 | 15 |
| 22 | 0 | 2 | 11 | 28 | 43 | 16 |
| 23 | 0 | 2 | 10 | 28 | 43 | 17 |
| 24 | 0 | 2 | 10 | 27 | 43 | 18 |
| 25 | 0 | 2 | 9 | 26 | 43 | 19 |
| 26 | 0 | 2 | 9 | 26 | 43 | 20 |
| 27 | 0 | 2 | 8 | 25 | 44 | 21 |
| 28 | 0 | 2 | 8 | 24 | 44 | 22 |
| 29 | 0 | 2 | 7 | 24 | 45 | 23 |
| 30 | 0 | 2 | 7 | 23 | 45 | 23 |
| 31 | 0 | 2 | 7 | 22 | 46 | 24 |
Wind in December
Winds average 21 km/h in December.
Across December, daily wind ranges from about 20 km/h on the calmest days to 21 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 21 | breezy |
| 2 | 21 | breezy |
| 3 | 21 | breezy |
| 4 | 21 | breezy |
| 5 | 21 | breezy |
| 6 | 21 | breezy |
| 7 | 21 | breezy |
| 8 | 21 | breezy |
| 9 | 21 | breezy |
| 10 | 21 | breezy |
| 11 | 21 | breezy |
| 12 | 21 | breezy |
| 13 | 21 | breezy |
| 14 | 21 | breezy |
| 15 | 21 | breezy |
| 16 | 21 | breezy |
| 17 | 21 | breezy |
| 18 | 21 | breezy |
| 19 | 21 | breezy |
| 20 | 21 | breezy |
| 21 | 21 | breezy |
| 22 | 21 | breezy |
| 23 | 20 | breezy |
| 24 | 20 | breezy |
| 25 | 20 | breezy |
| 26 | 20 | breezy |
| 27 | 20 | breezy |
| 28 | 20 | breezy |
| 29 | 20 | breezy |
| 30 | 20 | breezy |
| 31 | 20 | breezy |
Sunrise & sunset in December
Daylight runs from about 13 h 12 min at the start of December to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over December. Sunrise moves from 5:27 AM to 5:38 AM, and sunset from 6:37 PM to 6:53 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.2 | 13.2 | 13.2 |
| Sunrise (AM) | 5:27 | 5:27 | 5:28 | 5:28 | 5:28 | 5:28 | 5:28 | 5:29 | 5:29 | 5:29 | 5:29 | 5:30 | 5:30 | 5:30 | 5:31 | 5:31 | 5:32 | 5:32 | 5:32 | 5:33 | 5:33 | 5:34 | 5:34 | 5:35 | 5:35 | 5:36 | 5:36 | 5:37 | 5:37 | 5:38 | 5:38 |
| Sunset (PM) | 6:37 | 6:38 | 6:39 | 6:39 | 6:40 | 6:41 | 6:41 | 6:42 | 6:42 | 6:43 | 6:44 | 6:44 | 6:45 | 6:45 | 6:46 | 6:46 | 6:47 | 6:47 | 6:48 | 6:48 | 6:49 | 6:49 | 6:50 | 6:50 | 6:51 | 6:51 | 6:52 | 6:52 | 6:52 | 6:53 | 6:53 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.2 | 5:27 | 6:37 |
| 2 | 13.2 | 5:27 | 6:38 |
| 3 | 13.2 | 5:28 | 6:39 |
| 4 | 13.2 | 5:28 | 6:39 |
| 5 | 13.2 | 5:28 | 6:40 |
| 6 | 13.2 | 5:28 | 6:41 |
| 7 | 13.2 | 5:28 | 6:41 |
| 8 | 13.2 | 5:29 | 6:42 |
| 9 | 13.2 | 5:29 | 6:42 |
| 10 | 13.2 | 5:29 | 6:43 |
| 11 | 13.2 | 5:29 | 6:44 |
| 12 | 13.2 | 5:30 | 6:44 |
| 13 | 13.2 | 5:30 | 6:45 |
| 14 | 13.2 | 5:30 | 6:45 |
| 15 | 13.2 | 5:31 | 6:46 |
| 16 | 13.3 | 5:31 | 6:46 |
| 17 | 13.3 | 5:32 | 6:47 |
| 18 | 13.3 | 5:32 | 6:47 |
| 19 | 13.3 | 5:32 | 6:48 |
| 20 | 13.3 | 5:33 | 6:48 |
| 21 | 13.3 | 5:33 | 6:49 |
| 22 | 13.3 | 5:34 | 6:49 |
| 23 | 13.3 | 5:34 | 6:50 |
| 24 | 13.3 | 5:35 | 6:50 |
| 25 | 13.3 | 5:35 | 6:51 |
| 26 | 13.3 | 5:36 | 6:51 |
| 27 | 13.3 | 5:36 | 6:52 |
| 28 | 13.3 | 5:37 | 6:52 |
| 29 | 13.2 | 5:37 | 6:52 |
| 30 | 13.2 | 5:38 | 6:53 |
| 31 | 13.2 | 5:38 | 6:53 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 7.94 kWh/m².
For context, solar energy here swings from a low near 4.19 kWh/m² to a high of 8.16 kWh/m² in November across the year — December's 7.94 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 8.1 | 8.1 | 8.1 | 8.1 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 7.9 | 7.9 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 |
| 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 | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 8.1 | Intense |
| 2 | 8.1 | Intense |
| 3 | 8.1 | Intense |
| 4 | 8.1 | Intense |
| 5 | 8.0 | Intense |
| 6 | 8.0 | Intense |
| 7 | 8.0 | Intense |
| 8 | 8.0 | Intense |
| 9 | 8.0 | Intense |
| 10 | 8.0 | Intense |
| 11 | 8.0 | Intense |
| 12 | 8.0 | Intense |
| 13 | 8.0 | Intense |
| 14 | 8.0 | Intense |
| 15 | 8.0 | Intense |
| 16 | 7.9 | Intense |
| 17 | 7.9 | Intense |
| 18 | 8.0 | Intense |
| 19 | 8.0 | Intense |
| 20 | 8.0 | Intense |
| 21 | 8.0 | Intense |
| 22 | 8.0 | Intense |
| 23 | 8.0 | Intense |
| 24 | 8.0 | Intense |
| 25 | 8.0 | Intense |
| 26 | 8.0 | Intense |
| 27 | 8.0 | Intense |
| 28 | 8.0 | Intense |
| 29 | 8.0 | Intense |
| 30 | 8.0 | Intense |
| 31 | 8.0 | Intense |
Hazard calendar for Karratha
In December, Karratha sits inside its cyclone season. The full year is below, with each hazard's peak months called out.
Karratha sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Is December a good time to visit Karratha?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit Karratha for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Karratha in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, Karratha sees daytime highs around 31°C and nights near 26°C. Pack light clothes and sun protection. Worth having: a windbreaker.
Sea temperature near Karratha in December
The nearest coast averages about 28°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 km away) is warmest in March at about 30°C and coldest in August near 23°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) | 29 | 30 | 30 | 29 | 27 | 24 | 23 | 23 | 24 | 25 | 27 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing | Refreshing | Refreshing | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 30 | Tropical |
| Mar | 30 | Tropical |
| Apr | 29 | Tropical |
| May | 27 | Warm |
| Jun | 24 | Warm |
| Jul | 23 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 24 | Refreshing |
| Oct | 25 | Warm |
| Nov | 27 | Warm |
| Dec | 28 | Warm |
UV index in Karratha in December
Clear-sky midday UV in December peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Karratha peaks around December 23 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 7 (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 | 14 | 13 | 10 | 8 | 7 | 7 | 8 | 10 | 12 | 13 | 15 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | Very high | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 14 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 8 | Very high |
| Jun | 7 | High |
| Jul | 7 | Very high |
| Aug | 8 | Very high |
| Sep | 10 | Extreme |
| Oct | 12 | Extreme |
| Nov | 13 | Extreme |
| Dec | 15 | Extreme |
Air quality in Karratha in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in Karratha is worst in December — around 49 µg/m³ PM2.5 (poor), about 7.0× the cleanest month (July, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 43 | 31 | 23 | 11 | 9 | 8 | 7 | 7 | 11 | 20 | 32 | 49 |
| Level | Poor | Moderate | Moderate | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 43 | Poor |
| Feb | 31 | Moderate |
| Mar | 23 | Moderate |
| Apr | 11 | Good |
| May | 9 | Good |
| Jun | 8 | Good |
| Jul | 7 | Good |
| Aug | 7 | Good |
| Sep | 11 | Good |
| Oct | 20 | Moderate |
| Nov | 32 | Moderate |
| Dec | 49 | Poor |
Where is Karratha?
Karratha sits at 20.7°S, 116.8°E, 20 m above sea level, in Australia. The nearest listed city is Port Hedland, 190 km away.
Topography around Karratha
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Karratha.
Within 3 km, the terrain around Karratha has only modest variations in elevation — a maximum elevation change of 123 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, significant variations in elevation — a maximum elevation change of 377 m.
The land around Karratha is covered by grassland (54%) within 3 km, grassland (51%) and water (31%) within 16 km, and grassland (48%) and water (44%) 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 Karratha (-20.7376°, 116.8463°, elevation 20 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).