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Sarnia, Ontario

Latitude 43.0° N | Longitude 82.3° W

Past 24 Hour Conditions

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Date / Time
(EDT)		 Conditions Temperature
(°C)		 Wind
(km/h)		 Humidex Relative
humidity
(%)		 Dew
point
(°C)		 Pressure
(kPa)		 Visibility
(km)
18 July 2025
09:00 n/a 18  (17.8) E 12 * 71 13 102.3 n/a
08:00 n/a 16  (15.9) E 8 * 77 12 102.3 n/a
07:00 n/a 13  (13.3) SE 8 * 88 11 102.2 n/a
06:00 n/a 12  (12.3)   SE 4 * 89 11 102.2 n/a
05:00 n/a 13  (12.7) E 6 * 86 11 102.1 n/a
04:00 n/a 14  (13.7) SE 5 * 82 11 102.1 n/a
03:00 n/a 15  (14.8) E 7 * 81 12 102.1 n/a
02:00 n/a 17  (16.9) NNE 16 * 78 13 102.0 n/a
01:00 n/a 17  (16.6) NNE 14 * 75 12 102.0 n/a
00:00 n/a 17  (16.8) NNE 20 gusts 29 * 74 12 102.0 n/a
17 July 2025
23:00 n/a 17  (16.9) NNE 23 gusts 31 * 75 13 102.0 n/a
22:00 n/a 17  (17.3) N 24 gusts 35 * 75 13 102.0 n/a
21:00 n/a 17  (17.3) NNE 25 * 80 14 101.9 n/a
20:00 n/a 17  (17.1) NNE 26 * 89 15 101.8 n/a
19:00 n/a 18  (17.9) NNE 25 gusts 38 * 90 16 101.7 n/a
18:00 n/a 19  (19.3) N 25 gusts 34 * 88 17 101.6 n/a
17:00 n/a 22  (22.4) NW 21 gusts 29 28 71 17 101.5 n/a
16:00 n/a 24  (23.5) NW 20 29 69 17 101.5 n/a
15:00 n/a 24  (23.8) WNW 17 gusts 32 30 70 18 101.4 n/a
14:00 n/a 24  (24.4)   WNW 22 31 69 18 101.3 n/a
13:00 n/a 24  (23.7) WNW 20 gusts 30 30 70 18 101.3 n/a
12:00 n/a 24  (23.5) WNW 22 gusts 31 30 76 19 101.2 n/a
11:00 n/a 22  (22.0) NW 27 gusts 38 28 79 18 101.2 n/a
10:00 n/a 22  (21.6) WNW 31 28 83 19 101.1 n/a
09:00 n/a 22  (21.8) W 18 gusts 28 29 88 20 100.8 n/a
Legend
n/a: not available
*: value not significant

This table displays weather elements available for this station

Highest temperature
Lowest temperature

Equal temperature values are all highlighted

This is an automated product, generated using preliminary data.

If you require additional historical weather information, please visit Climate website.

Highlighting criteria

Significant Weather Conditions

To highlight potentially dangerous weather conditions the following are displayed in bold characters:

  • Tornado
  • Funnel Cloud
  • Thunderstorm
  • Lightning
  • Hail
  • Freezing precipitation
  • Heavy precipitation
  • Any other weather condition, if the visibility is 1.0 km0.6 miles or less

In addition some weather elements are displayed in bold characters when they reach the following values:

Temperatures:

  • Hot: 30.0°C86°F and higher
  • Cold: -30.0°C-22°F and lower
Humidex:
  • Values of 3595 and more
Wind chill
  • Values of -35-31 and below

Winds:

  • Mean speed of 60 km/h37 mph or more
  • Gust speed of 90 km/h56 mph or more

Visibility:

  • 1.0 km0.6 miles or less along with the weather conditions

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