5-day weather forecast Niagara 18-05-2026

Weather forecast Niagara tomorrow 18.05.2026: light rain shower, temperature from 9 °C to 24 °C.

Precipitation probability 100%. Wind up to 6.19 m/s (gusts 8.5 m/s). Air humidity 68–100%, atmospheric pressure 754–758 mm Hg, UV index up to 6.6.

Sunrise 05:17
Sunset 20:20

Waxing Crescent2% illuminated
Moonrise 06:15 · Moonset 23:23

Chart

Table

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

Forecast from 9 °C to 24 °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)	9	10	10	11	12	13	14	14	16	18	19	20	20	22	23	24	23	23	22	20	18	16	15	14
Precipitation (mm/hr)	0.1	0.06	0	0	1.59	2.78	0.82	1.95	0	0	0	1.71	0.08	0.02	1.38	0.05	1.29	0.5	0.03	0.15	0	1.71	0.1	0.24

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 (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	98	55	76	87	79	79	88	100	100	100	100
Rain chance (%)	100	100	0	0	100	100	100	100	0	0	0	100	100	80	100	100	100	100	68	100	0	100	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)	3.19	3.11	2.89	2.61	3.39	3.39	2.31	1.39	2.31	3.5	4.69	4.89	5	5	6.19	5.89	5.39	4.19	4.31	3.81	1.81	3.11	2.61	2.5
Wind gust (m/s)	5.14	5.5	5.31	4.97	6.11	5.69	4.22	2.69	4.14	4.97	6.33	7.08	7.31	8.39	8.5	7.22	7.75	6.03	6.72	5.81	3.58	4.67	4.03	3.53
Wind direction (°)	ESE 110°	ESE 120°	SE 126°	SE 133°	SSE 152°	S 172°	SSW 192°	SSW 192°	SSE 150°	S 174°	S 190°	SSW 199°	SSW 206°	SW 218°	SW 214°	SW 221°	SW 226°	WSW 242°	WSW 245°	WSW 248°	W 273°	NNW 327°	NNW 335°	N 1°

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 (%)	99	99	99	99	100	99	99	99	100	97	94	93	91	89	85	68	74	86	82	83	92	96	98	97

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)	758	758	757	756	755	755	755	755	755	754	754	754	754	755	755	755	755	755	755	755	756	757	758	758

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	0.2	0.6	1.6	1.8	1.9	5	2.4	6.6	4.5	3.8	2.2	1	0.3	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)	8.2	6.2	5.3	5.1	5.5	5.1	4.8	4.9	4.7	4.2	3.9	3.9	3.8	3.9	4.1	4.2	4.3	5.7	6.8	5	3.4	3.4	3.1	3.5
PM10 (µg/m³)	8.5	6.6	5.8	5.7	6.5	6	5.5	5.6	6	5.3	4.9	5.2	4.9	4.9	4.9	5.2	5.3	6.3	7.2	5.2	3.5	3.6	3.3	3.7
Ozone (O₃) (µg/m³)	84	81	78	78	79	80	81	81	82	83	85	86	86	84	83	82	82	80	76	71	67	64	62	60
NO₂ (µg/m³)	3.9	3.8	3.6	3.1	2.5	2	1.8	1.8	1.8	1.7	1.7	1.7	1.9	2.1	2.5	3	3.7	4.2	4.5	4.7	4.7	4.5	4.2	3.9
SO₂ (µg/m³)	2	1.9	1.8	1.8	1.7	1.7	1.6	1.6	1.5	1.4	1.4	1.3	1.3	1.2	1.2	1.2	1.3	1.3	1.3	1.4	1.4	1.4	1.4	1.4
CO (µg/m³)	156.9	152.9	148.9	145.9	143.9	141.9	140.9	140.9	141.9	143.9	146.9	149.9	152.9	155.9	157.9	158.9	159.9	160.9	163.9	167.9	169.9	168.9	166.9	162.9

← Sun, May 17

Mon, May 18, 2026

Tue, May 19 →

Niagara on the map

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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