5-day weather forecast Sydney 18-05-2026

Weather forecast Sydney Monday, May 18 18.05.2026: cloudy, temperature from 17 °C to 20 °C.

Precipitation probability 62%. Wind up to 3.69 m/s (gusts 5.25 m/s). Air humidity 70–90%, atmospheric pressure 762–765 mm Hg, UV index up to 2.5.

Sunrise 06:42
Sunset 17:01

Waxing Crescent2% illuminated
Moonrise 08:16 · Moonset 17:56

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Table

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

Forecast from 17 °C to 20 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	17	17	17	17	17	17	17	17	17	18	19	19	20	20	20	19	19	19	19	18	18	18	18	17
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0.03	0	0	0.01	0	0	0	0.01	0.1	0.02	0.32	0.31	0	0.05	0.17	0.47

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	69	67	57	58	100	100	83	100	85	50	69	81	65	74	74	83	100	100	74	85	100	100	83	100
Rain chance (%)	0	0	0	0	0	0	0	0	62	0	0	79	0	0	0	70	100	77	100	100	0	78	100	100

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	1.81	1.5	1.5	1	1.5	1.31	1.19	1.81	1.31	1.61	0.69	1.11	2.31	1.39	0.61	1.19	2.11	2.19	2.61	3.31	3.19	3.69	3.5	2.81
Wind gust (m/s)	3.11	2.5	2.53	1.75	2.64	2.19	2	2.94	1.89	2.08	0.86	1.39	2.94	1.78	0.78	1.67	3.06	3.25	3.81	4.89	4.64	5.25	4.97	3.92
Wind direction (°)	NW 312°	NW 309°	WNW 292°	WNW 284°	WNW 299°	WNW 292°	WNW 288°	W 279°	WNW 284°	W 268°	W 269°	NW 309°	W 273°	WSW 256°	SW 235°	ENE 63°	NE 34°	NNE 31°	N 6°	N 8°	NNE 18°	NNE 21°	NNE 12°	N 355°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	88	86	86	86	86	86	86	86	83	79	74	73	71	70	71	74	77	79	81	85	85	86	88	90

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	765	765	765	764	764	764	764	765	765	765	765	764	764	764	763	763	763	763	764	764	763	763	763	762

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.3	1.1	1.6	2.5	1.9	1.6	1	0.4	0.1	0	0	0	0	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	9.2	9.6	9.8	13.2	13.5	13.6	13.6	13	13.4	15.6	18.8	22.8	26	27.4	28.3	29.2	30.1	33.5	40.4	41.3	39	28.5	22.3	16.3
PM10 (µg/m³)	10.9	11.7	11.9	15.2	15.2	15.1	15	14.3	14.6	16.7	19.8	23.8	27.1	28.3	28.8	29.5	30.1	33.5	40.5	41.5	39.2	29.4	23.2	17.1
Ozone (O₃) (µg/m³)	44	45	44	37	26	18	14	12	10	7	5	3	2	1	1	1	1	2	4	7	13	23	37	47
NO₂ (µg/m³)	17.8	18.1	20.2	25.2	32	37.4	39.7	40.7	41.6	43.3	45.1	46.2	46.3	45.8	45	43.8	42.3	41.7	43.3	45.8	46.1	41.8	35.3	30.6
SO₂ (µg/m³)	14.8	14.2	13.9	14.2	14.9	15.6	16.2	16.9	17.3	17.4	17.3	16.9	16.1	15.1	14.3	13.6	13.2	13.9	16.7	20.6	23.5	24.7	25	24.6
CO (µg/m³)	78.9	82.9	88.9	97.9	109.9	117.9	116.9	112.9	116.9	135.9	162.9	185.9	201.9	214.9	225.9	237.9	248.9	254.9	255.9	252.9	242.9	216.9	184.9	168.9

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

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Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.

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