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Sarnia Weather Forecast

Temperature, wind, rain and more for Sarnia

Ontario, Canada

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 25
Jan		02:00

S
S

 2 / 4 mph 26 / 24°F 93% 1021 mb
Low level cloud: 50%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

NE
NE

 3 / 5 mph 25 / 22°F 91% 1021 mb
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
08:00

ENE
ENE

 0 / 1 mph 26 / 26°F 89% 1021 mb
Low level cloud: 70%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: low
73%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
11:00

ESE
ESE

 2 / 2 mph 29 / 29°F 84% 1022 mb
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 46%
Most Significant Cloud Type: low
85%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
14:00

ENE
ENE

 5 / 5 mph 31 / 26°F 78% 1020 mb
Low level cloud: 76%
Mid level cloud: 0%
High level cloud: 74%
Most Significant Cloud Type: low
84%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
17:00

NE
NE

 8 / 9 mph 31 / 23°F 80% 1019 mb
Low level cloud: 100%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
20:00

ENE
ENE

 11 / 16 mph 28 / 19°F 81% 1019 mb
Low level cloud: 100%
Mid level cloud: 43%
High level cloud: 65%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
23:00

ENE
ENE

 14 / 22 mph 27 / 15°F 82% 1016 mb
Low level cloud: 12%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 26
Jan		02:00

ENE
ENE

 13 / 15 mph 29 / 18°F 82% 1015 mb
Low level cloud: 19%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
05:00

ENE
ENE

 15 / 21 mph 28 / 16°F 85% 1011 mb
Low level cloud: 50%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
08:00

ENE
ENE

 16 / 19 mph 29 / 17°F 94% 1010 mb
Low level cloud: 81%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
11:00

ENE
ENE

 15 / 17 mph 31 / 21°F 95% 1009 mb
Low level cloud: 76%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
14:00

NE
NE

 12 / 14 mph 33 / 24°F 96% 1009 mb
Low level cloud: 82%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.08 In of precipitation over the past 3 hours.
0.08 In
17:00

NE
NE

 10 / 11 mph 33 / 25°F 97% 1010 mb
Low level cloud: 88%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.04 In of precipitation over the past 3 hours.
0.04 In
20:00

NE
NE

 13 / 15 mph 31 / 21°F 92% 1011 mb
Low level cloud: 88%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
23:00

NE
NE

 10 / 12 mph 30 / 21°F 88% 1013 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
The 7 day weather forecast summary for Sarnia:

The forecast for Sarnia in the coming week is predicting the average daytime maximum temperature will be around -1°C, with a high for the week of 5°C expected on the evening of Sunday 31st. The mean minimum temperature will be -6°C, dipping to its lowest on the morning of Saturday 30th at -11°C. Expect the coming week to have some days seeing a little precipitation and some days with rain, sleet or snow. Current predictions suggest Sunday 30th will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be moderate.

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image � it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure