5-day weather forecast Niagara Falls 15-08-2026

Weather forecast Niagara Falls Saturday, August 15 15.08.2026: sunny, temperature from 15 °C to 25 °C.

Precipitation probability 37%. Wind up to 3.5 m/s (gusts 5.75 m/s). Air humidity 43–88%, atmospheric pressure 765–769 mm Hg, UV index up to 7.

Weather Alerts

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ModerateAug 12, 12:03 PM — Aug 13, 01:02 AMTranslate with Google

yellow watch - severe thunderstorm - in effect

thunderstorm

Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain. What: Wind gusts near 100 km/h. Toonie sized hail. Heavy rain in excess of 40 mm. When: This afternoon into this evening. Additional Information: The highest rainfall amounts are expected for areas that receive multiple thunderstorms. ### Local utility outages are possible. Fast-moving and rapidly rising water can sweep vehicles away and damage infrastructure. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #ONStorm. For more information: https://www.ontario.ca/page/be-prepared-emergency.

When thunder roars, go indoors! Lightning kills and injures Canadians every year. Secure loose objects. Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.

SevereAug 12, 12:08 PM — Aug 13, 02:00 AMTranslate with Google

squall watch in effect

squall

Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail. Thunderstorms are expected to track east over the lakes this afternoon and evening. ### Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

5 days at a glance — tap a day to open it

Sunrise 06:22
Sunset 20:19

Waxing Crescent11% illuminated
Moonrise 09:40 · Moonset 21:35

Chart

Table

← Fri, Aug 14

Sat, Aug 15, 2026

Sun, Aug 16 →

Forecast from 15 °C to 25 °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)	18	17	17	16	16	16	15	16	17	19	21	22	24	24	24	25	24	23	22	21	21	21	20	19
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.02	0.07	0.06	0.45

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 (%)	4	6	4	3	21	16	12	1	0	6	20	21	26	17	30	14	51	47	50	47	78	72	65	63
Rain chance (%)	11	12	13	13	14	13	13	11	8	5	4	3	3	2	3	2	4	6	7	7	12	17	17	37

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	2.39	2.31	2.31	2.61	2.31	2.5	2.31	2.5	3.11	2.81	2.5	2.5	2.61	2.61	2.39	1.31	1.69	2.19	2	1.19	0.81	1.69	3.5
Wind gust (m/s)	5.75	4.42	4.25	4.25	4.83	4.39	4.86	4.31	3.97	3.97	3.31	2.89	2.89	3	3	2.75	1.61	2.39	3.39	3.42	2.17	1.33	2.67	5.28
Wind direction (°)	E 96°	ESE 104°	ESE 102°	E 101°	E 100°	ESE 107°	ESE 108°	ESE 112°	ESE 106°	ESE 107°	ESE 106°	E 94°	ENE 73°	ENE 65°	ENE 71°	ENE 67°	NE 43°	NE 38°	NE 47°	NNE 28°	NNE 19°	W 279°	SW 218°	SSW 206°

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 (%)	85	87	88	88	88	88	87	84	77	66	58	50	46	45	44	43	46	54	58	61	61	60	62	70

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)	767	768	768	768	768	768	768	769	769	769	769	769	768	768	767	767	767	766	765	765	765	766	765	765

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	0.1	0.6	1.7	3.4	5.4	7	7	4.1	2.1	1.2	1.1	0.1	0.1	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)	4.5	4.5	4.4	4.3	4.2	4.4	4.5	4.7	4.3	3.6	2.8	2.4	2.3	2.2	2.3	2.4	2.7	3	3.6	3.8	3.6	3.1	2.8	2.9
PM10 (µg/m³)	4.5	4.5	4.5	4.3	4.3	4.4	4.6	4.8	4.4	3.6	2.9	2.5	2.4	2.3	2.4	2.5	2.8	3.1	3.7	3.9	3.7	3.2	2.9	2.9
Ozone (O₃) (µg/m³)	65	62	60	58	56	55	53	51	52	58	68	76	81	84	87	92	98	100	95	87	79	73	67	62
NO₂ (µg/m³)	8	8	7.9	7.7	7.5	7.3	7.4	7.5	7	5.4	3.2	1.6	1.1	1.1	1.3	1.3	1.5	2.2	4	6.4	8	7.9	7.1	6.5
SO₂ (µg/m³)	0.9	0.7	0.6	0.6	0.6	0.7	0.8	0.9	0.9	0.9	0.8	0.7	0.7	0.7	0.7	0.8	1	1.1	1.2	1.3	1.3	1.1	0.8	0.6
CO (µg/m³)	241	242	235	210	176	153	151	158	162	154	142	133	129	128	127	125	124	124	128	134	138	140	140	141

← Fri, Aug 14

Sat, Aug 15, 2026

Sun, Aug 16 →

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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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