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⚠Yellow Watch - Severe Thunderstorm ▶
12:01 p.m. EDT Tuesday 21 July 2026

Impact Level: Moderate

Forecast Confidence: High


Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.

Hazards:
Torrential downpours. Local rainfall amounts in excess of 50 mm.
Wind gusts of 90 to 110 km/h.
Quarter to ping pong ball size hail.

Timing:
Late this morning through early this evening.

Additional information:
The main hazards will be heavy rainfall and damaging wind gusts. Local rainfall amounts in excess of 50 mm may occur for areas that receive multiple thunderstorms. The greatest likelihood for damaging wind gusts is expected to be over southwestern Ontario. A few instances of large hail are possible.

Local utility outages are possible. Damage to roofs, fences, branches or soft shelters is possible.

When thunder roars, go indoors! Lightning kills and injures Canadians every year.

Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.

Heavy rain can cause flash flooding and significant reductions to visibility.

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 X using #ONStorm.

For more information: https://www.ontario.ca/page/be-prepared-emergency.

In effect for:
  • London - Parkhill - Eastern Middlesex County
Observed at: London Int'l Airport
Date: 12:15 PM EDT Tuesday 21 July 2026
Mist
Mist 		Temp.: 24 °C
Wind: SW 20 gust 34 km/h
Humidity: 90 %
Dew point: 22 °C
Pressure: 100.1 kPa
Tendency: 0.06 kPa
Visibility: 10 km 		Sunrise: 6:05
Sunset: 20:58
Normals:
Max 26°C Min 16°C
 Extended Forecast - Environment Canada
Today
Showers
Showers
Max: 27°C
 Wed, 22 Jul
Clearing
Clearing
Max: 21°C
 Thu, 23 Jul
Sunny
Sunny
Max: 23°C
 Fri, 24 Jul
Sunny
Sunny
Max: 26°C
 Sat, 25 Jul
Chance of showers (30%)
Chance of showers
Max: 28°C
 Sun, 26 Jul
Chance of showers (40%)
Chance of showers
Max: 29°C
 Mon, 27 Jul
Chance of showers (30%)
Chance of showers
Max: 25°C
Tonight
Chance of showers (30%)
Chance of showers
Min: 15°C
 Night
Clear
Clear
Min: 10°C
 Night
Clear
Clear
Min: 12°C
 Night
Cloudy periods
Cloudy periods
Min: 15°C
 Night
Chance of showers (30%)
Chance of showers
Min: 19°C
 Night
Chance of showers (40%)
Chance of showers
Min: 15°C
  

Forecast

London, ON (Issued: 11:00 AM EDT Tuesday 21 July 2026)

Today
Mainly cloudy. 30 percent chance of showers early this afternoon. A few showers beginning this afternoon. Risk of a thunderstorm this afternoon. Hazy early this afternoon. Local amount 10 to 15 mm. Wind southwest 30 km/h gusting to 50. High 27. Humidex 35. UV index 7 or high.
Tonight
A few showers ending this evening then cloudy with 30 percent chance of showers. Risk of a thunderstorm early this evening. Wind northwest 30 km/h gusting to 50. Low 15.
Wed, 22 Jul
Cloudy. Clearing late in the afternoon. Wind northwest 30 km/h gusting to 50. High 21. UV index 5 or moderate.
Night
Clear. Low 10.
Thu, 23 Jul
Sunny. High 23.
Night
Clear. Low 12.
Fri, 24 Jul
Sunny. High 26.
Night
Cloudy periods. Low 15.
Sat, 25 Jul
A mix of sun and cloud with 30 percent chance of showers. High 28.
Night
Cloudy with 30 percent chance of showers. Low 19.
Sun, 26 Jul
Cloudy with 40 percent chance of showers. High 29.
Night
Cloudy periods with 40 percent chance of showers. Low 15.
Mon, 27 Jul
A mix of sun and cloud with 30 percent chance of showers. High 25.

24 Hour Forecast - London, ON

Date/Time Temp.
(°C)
Weather Conditions
LOP †		 Wind
(km/h)
21 July 2026
1 PM 27 Chance of showers. Risk of thunderstorms (30%)  Chance of showers. Risk of thunderstorms 30 SW 30 gust 50
2 PM 27 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 SW 30 gust 50
3 PM 26 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 SW 30 gust 50
4 PM 26 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 SW 30 gust 50
5 PM 25 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 SW 30 gust 50
6 PM 24 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 NW 30 gust 50
7 PM 23 A few showers. Risk of thunderstorms (80%)  A few showers. Risk of thunderstorms 80 NW 30 gust 50
8 PM 22 Chance of showers (30%)  Chance of showers 30 NW 30 gust 50
9 PM 21 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
10 PM 19 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
11 PM 18 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
22 July 2026
12 AM 17 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
1 AM 17 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
2 AM 16 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
3 AM 16 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
4 AM 15 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
5 AM 15 Chance of showers (30%)  Chance of showers 30 NW 20 gust 40
6 AM 15 Cloudy (20%)  Cloudy 20 NW 30 gust 50
7 AM 15 Cloudy (20%)  Cloudy 20 NW 30 gust 50
8 AM 15 Cloudy (20%)  Cloudy 20 NW 30 gust 50
9 AM 16 Cloudy (20%)  Cloudy 20 NW 30 gust 50
10 AM 17 Cloudy (0%)  Cloudy 0 NW 30 gust 50
11 AM 18 Cloudy (0%)  Cloudy 0 NW 30 gust 50
12 PM 19 Cloudy (0%)  Cloudy 0 NW 30 gust 50
 
† Likelihood of Precipitation (LOP) as described in the public forecast as a chance of measurable precipitation for a period of time.
  Nil: 0%
  Low: 40% or below
  Medium: 60% or 70%
  High: Above 70%

Environment Canada