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Updated: 01/05/2026 08:35

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Yellow Advisory - Frost

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7:54 a.m. EDT Friday 1 May 2026

Impact Level: Moderate

Forecast Confidence: High

Frost may damage some crops in frost-prone areas.

Patchy frost is expected again tonight as temperatures drop to near or below freezing.

Patchy frost is likely again Saturday night for some areas that remain clear.

Damage to plants, trees, and crops is possible.

Cover up plants, especially those in frost-prone areas.

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.

In effect for:

London - Parkhill - Eastern Middlesex County

Observed at: London Int'l Airport Date: 8:00 AM EDT Friday 1 May 2026
Mostly Cloudy	Temp.: 3 °C Wind: ENE 4 km/h Humidity: 77 % Dew point: -1 °C Pressure: 101.4 kPa Tendency: 0.05 kPa Visibility: 24 km	Sunrise: 6:19 Sunset: 20:26 Normals: Max 17°C Min 5°C

Extended Forecast - Environment Canada
Today Chance of showers Max: 10°C	Sat, 2 May Chance of showers Max: 9°C	Sun, 3 May Chance of showers Max: 15°C	Mon, 4 May Chance of showers Max: 22°C	Tue, 5 May Chance of showers Max: 19°C	Wed, 6 May Chance of showers Max: 12°C	Thu, 7 May Chance of showers Max: 11°C
Tonight Chance of showers Min: -1°C	Night Clear Min: -5°C	Night Chance of showers Min: 7°C	Night Chance of showers Min: 10°C	Night Chance of showers Min: 10°C	Night Chance of showers Min: 4°C

Forecast

London, ON (Issued: 5:00 AM EDT Friday 1 May 2026)

Today: Mainly cloudy with 40 percent chance of showers this morning and early this afternoon. Clearing this afternoon. Wind becoming north 20 km/h gusting to 40 near noon. High 10. UV index 6 or high.
Tonight: Increasing cloudiness early this evening. 30 percent chance of showers this evening. Wind north 20 km/h gusting to 40 becoming light near midnight. Low minus 1 with frost. Wind chill minus 5 overnight.
Sat, 2 May: A mix of sun and cloud. 30 percent chance of showers in the afternoon. Wind up to 15 km/h. High 9. Wind chill minus 5 in the morning. UV index 5 or moderate.
Night: Clear. Low minus 5.
Sun, 3 May: A mix of sun and cloud with 40 percent chance of showers. High 15.
Night: Cloudy with 30 percent chance of showers. Low 7.
Mon, 4 May: A mix of sun and cloud with 30 percent chance of showers. High 22.
Night: Cloudy periods with 40 percent chance of showers. Low 10.
Tue, 5 May: Cloudy with 40 percent chance of showers. High 19.
Night: Cloudy with 30 percent chance of showers. Low 10.
Wed, 6 May: Cloudy with 30 percent chance of showers. High 12.
Night: Cloudy with 30 percent chance of showers. Low plus 4.
Thu, 7 May: Cloudy with 30 percent chance of showers. High 11.

24 Hour Forecast - London, ON

Date/Time	Temp. (°C)	Weather Conditions	LOP †	Wind (km/h)
1 May 2026
9 AM	2	Chance of showers	40	NE 10
10 AM	3	Chance of showers	40	NE 10
11 AM	4	Chance of showers	40	NE 10
12 PM	6	Chance of showers	40	N 20 gust 40
1 PM	8	Chance of showers	40	N 20 gust 40
2 PM	10	Mainly sunny	20	N 20 gust 40
3 PM	10	Mainly sunny	20	N 20 gust 40
4 PM	10	Sunny	20	N 20 gust 40
5 PM	10	Sunny	20	N 20 gust 40
6 PM	9	Mainly sunny	20	N 20 gust 40
7 PM	8	Chance of showers	30	N 20 gust 40
8 PM	7	Chance of showers	30	N 20 gust 40
9 PM	6	Chance of showers	30	N 20 gust 40
10 PM	4	Partly cloudy	10	N 20 gust 40
11 PM	3	Partly cloudy	10	N 20 gust 40
2 May 2026
12 AM	2	Mainly cloudy	10	N 10
1 AM	1	Mainly cloudy	10	N 10
2 AM	0	Mainly cloudy	10	N 10
3 AM	0	Mainly cloudy	10	N 10
4 AM	-1	Mainly cloudy	10	N 10
5 AM	-1	Partly cloudy	10	N 10
6 AM	-1	A mix of sun and cloud	10	N 10
7 AM	-1	A mix of sun and cloud	10	N 10
8 AM	-1	A mix of sun and cloud	10	N 10

† 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