How warm is it in Sydney in August?

Daytime highs averaged 17.9 °C, night-time lows 12.5 °C. The highest value of the past 10 years was 25.5 °C (30 Aug 2024), the lowest 7.5 °C (5 Aug 2020).

How often does it rain in Sydney in August?

On average there were 6.6 rain days (at least 1 mm) with 42.6 mm of precipitation in total.

How warm is the sea in Sydney in August?

The sea temperature averaged 17.8 °C (open-sea point approx. 10 km from the town).

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Sydney weather in August: temperature & rain

Photo: Diliff · CC BY-SA 3.0

🇦🇺 Weather in Sydney in August

This is what the weather in Sydney (New South Wales, Australia) was like in August over the years 2017–2026.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

17.9 °C

16.6 °C – 19.1 °C

Avg. night-time low

12.5 °C

11.1 °C – 14.0 °C

Avg. rain days in period

6.6

21 % of days · ≥ 1.0 mm

Avg. precipitation in period

42.6 mm

12.5 mm – 134 mm

Avg. cloud cover

50 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

17.8 °C

Sea measuring point approx. 10 km from the location

Extremes: Highest temperature 25.5 °C (30 Aug 2024) · Lowest temperature 7.5 °C (5 Aug 2020) · Avg. daily peak wind 21 km/h

Weather mix of all days

77Sunny
116Partly cloudy
28Cloudy
42Light rain
24Rain

Summary

On average 17.9 °C during the day and 12.5 °C at night.
On average 6.6 rain days (Rain day = at least 1.0 mm of precipitation) with 42.6 mm of precipitation in total.
The sea averaged 17.8 °C.
Prevailing weather: Partly cloudy.
Warmest year: 2024 (avg. 19.1 °C), coolest: 2020 (avg. 16.6 °C).
Wettest year: 2025 (134 mm), driest: 2018 (12.5 mm).
Extremes: 25.5 °C on 30 Aug 2024 and 7.5 °C on 5 Aug 2020.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max18.5°Avg. min13.3°
Rain days
8 Rain days
Precipitation
27.2 mm
Avg. cloud cover
–
Sea temperature
17.7 °C
Max 21.2 °C · Min 9.5 °C
2025
Avg. max17.0°Avg. min13.5°
Rain days
14 Rain days
Precipitation
134 mm
Avg. cloud cover
61 % cloudy
Sea temperature
19.4 °C
Max 20.8 °C · Min 10.6 °C
2024
Avg. max19.1°Avg. min14.0°
Rain days
5 Rain days
Precipitation
16.6 mm
Avg. cloud cover
57 % cloudy
Sea temperature
17.6 °C
Max 25.5 °C · Min 9.6 °C
2023
Avg. max18.8°Avg. min13.2°
Rain days
8 Rain days
Precipitation
42.6 mm
Avg. cloud cover
45 % cloudy
Sea temperature
18.1 °C
Max 22.9 °C · Min 10.8 °C
2022
Avg. max17.2°Avg. min12.3°
Rain days
8 Rain days
Precipitation
34.8 mm
Avg. cloud cover
56 % cloudy
Sea temperature
17.8 °C
Max 21.2 °C · Min 9.8 °C
2021
Avg. max18.6°Avg. min12.1°
Rain days
5 Rain days
Precipitation
39.8 mm
Avg. cloud cover
45 % cloudy
Sea temperature
17.5 °C
Max 22.4 °C · Min 9.8 °C
2020
Avg. max16.6°Avg. min11.1°
Rain days
6 Rain days
Precipitation
73.1 mm
Avg. cloud cover
46 % cloudy
Sea temperature
17.3 °C
Max 20.3 °C · Min 7.5 °C
2019
Avg. max17.9°Avg. min11.9°
Rain days
5 Rain days
Precipitation
32.8 mm
Avg. cloud cover
44 % cloudy
Sea temperature
18.2 °C
Max 22.5 °C · Min 8.3 °C
2018
Avg. max17.1°Avg. min11.2°
Rain days
5 Rain days
Precipitation
12.5 mm
Avg. cloud cover
45 % cloudy
Sea temperature
16.3 °C
Max 21.4 °C · Min 8.8 °C
2017
Avg. max17.8°Avg. min12.1°
Rain days
2 Rain days
Precipitation
12.9 mm
Avg. cloud cover
54 % cloudy
Sea temperature
18.5 °C
Max 22.4 °C · Min 10.3 °C

Frequently asked questions

How warm is it in Sydney in August?: Daytime highs averaged 17.9 °C, night-time lows 12.5 °C. The highest value of the past 10 years was 25.5 °C (30 Aug 2024), the lowest 7.5 °C (5 Aug 2020).
How often does it rain in Sydney in August?: On average there were 6.6 rain days (at least 1 mm) with 42.6 mm of precipitation in total.
How warm is the sea in Sydney in August?: The sea temperature averaged 17.8 °C (open-sea point approx. 10 km from the town).

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 10 km from the location (-33.870, 151.320)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)