Weather in Sarnia

Ontario, 185 m · continuously updated

–^°C

– –

Wind: –
Humidity: –
Rain ahead: –
Sunset: –

Temperature · last 4 and next 28 hours

Sarnia weather: the next 24 hours

Updated hourly.

Sarnia 14-day forecast

Two-week trend.

Rain radar

Sun and golden hours

Sunrise –, golden light until –

Sunset –, golden light from –

–

Air quality

–

European index, measured continuously.

UV index

–

Daily maximum — protection advised from 3.

Freezing level

–

Snow settles about 300 m below it.

Around Sarnia

Neighbouring towns, as the crow flies.

Corunna11 km Camlachie21 km Petrolia23 km Wallaceburg43 km Lambton Shores44 km Strathroy64 km Chatham65 km Belle River80 km

7-day forecast for Sarnia

Today (Thursday 15 Oct) in Sarnia: overcast, 11 to 15 °C, precipitation 0.0 mm (45 %), wind up to 18 km/h. Tomorrow: light snow, 7 to 18 °C.

Day	Weather	Min	Max	Precip.	Wind
Today	overcast	11 °C	15 °C	0.0 mm	18 km/h
Tomorrow	light snow	7 °C	18 °C	17.6 mm	36 km/h
Sat 17 Oct	rain	2 °C	11 °C	4.4 mm	37 km/h
Sun 18 Oct	sunny	4 °C	16 °C	0.0 mm	28 km/h
Mon 19 Oct	overcast	7 °C	19 °C	0.0 mm	21 km/h
Tue 20 Oct	overcast	9 °C	18 °C	0.0 mm	11 km/h
Wed 21 Oct	overcast	9 °C	16 °C	0.0 mm	15 km/h

Forecast updated on 15.10.2026 at 11:44 (Open-Meteo model, elevation 185 m). The live block at the top of the page is refreshed hourly and covers 14 days.

Tomorrow's weather in Sarnia

Tomorrow, Friday 16 Oct, in Sarnia: light snow, from 7 to 18 °C, 17.6 mm of precipitation (probability 81 %), wind up to 36 km/h.

Hour	Weather	Temp.	Precip.	Chance	Wind
00:00	overcast	14 °C	0.0 mm	53 %	18 km/h
03:00	overcast	17 °C	0.0 mm	22 %	22 km/h
06:00	overcast	18 °C	0.0 mm	19 %	22 km/h
09:00	overcast	15 °C	0.0 mm	13 %	22 km/h
12:00	overcast	13 °C	0.0 mm	10 %	19 km/h
15:00	heavy drizzle	10 °C	1.1 mm	17 %	28 km/h
18:00	overcast	9 °C	0.0 mm	16 %	29 km/h
21:00	drizzle	8 °C	0.7 mm	24 %	30 km/h

Frequently asked questions

Will it rain tomorrow in Sarnia?

Yes: 17.6 mm expected, probability 81 %.

How warm will it be tomorrow in Sarnia?

Between 7 and 18 °C.

The weekend

This weekend in Sarnia: Saturday rain, 2 to 11 °C, Sunday sunny, 4 to 16 °C.

Day	Weather	Min	Max	Precip.	Wind
Sat 17 Oct	rain	2 °C	11 °C	4.4 mm	37 km/h
Sun 18 Oct	sunny	4 °C	16 °C	0.0 mm	28 km/h

Hour by hour

The next 48 hours in Sarnia, hour by hour: temperature from 2 to 18 °C, 22.0 mm of rain expected.

Hour	Weather	Temp.	Precip.	Chance	Wind
11:00	overcast	12 °C	0.0 mm	0 %	12 km/h
12:00	overcast	13 °C	0.0 mm	0 %	12 km/h
13:00	overcast	14 °C	0.0 mm	1 %	9 km/h
14:00	overcast	14 °C	0.0 mm	1 %	11 km/h
15:00	overcast	15 °C	0.0 mm	1 %	13 km/h
16:00	overcast	15 °C	0.0 mm	2 %	12 km/h
17:00	overcast	15 °C	0.0 mm	5 %	12 km/h
18:00	overcast	15 °C	0.0 mm	10 %	14 km/h
19:00	overcast	14 °C	0.0 mm	26 %	11 km/h
20:00	overcast	13 °C	0.0 mm	36 %	14 km/h
21:00	overcast	13 °C	0.0 mm	38 %	14 km/h
22:00	overcast	13 °C	0.0 mm	38 %	16 km/h
23:00	overcast	13 °C	0.0 mm	45 %	18 km/h
00:00	overcast	14 °C	0.0 mm	53 %	18 km/h
01:00	drizzle	15 °C	0.7 mm	68 %	21 km/h
02:00	overcast	16 °C	0.0 mm	47 %	18 km/h
03:00	overcast	17 °C	0.0 mm	22 %	22 km/h
04:00	overcast	18 °C	0.0 mm	16 %	19 km/h
05:00	overcast	18 °C	0.0 mm	11 %	18 km/h
06:00	overcast	18 °C	0.0 mm	19 %	22 km/h
07:00	overcast	17 °C	0.0 mm	12 %	24 km/h
08:00	overcast	16 °C	0.0 mm	12 %	24 km/h
09:00	overcast	15 °C	0.0 mm	13 %	22 km/h
10:00	overcast	14 °C	0.0 mm	6 %	22 km/h
11:00	overcast	14 °C	0.0 mm	4 %	20 km/h
12:00	overcast	13 °C	0.0 mm	10 %	19 km/h
13:00	light drizzle	12 °C	0.4 mm	24 %	15 km/h
14:00	drizzle	11 °C	0.7 mm	19 %	25 km/h
15:00	heavy drizzle	10 °C	1.1 mm	17 %	28 km/h
16:00	light rain	9 °C	1.4 mm	28 %	28 km/h
17:00	drizzle	9 °C	0.7 mm	24 %	29 km/h
18:00	overcast	9 °C	0.0 mm	16 %	29 km/h
19:00	overcast	8 °C	0.0 mm	19 %	28 km/h
20:00	rain	8 °C	4.7 mm	25 %	31 km/h
21:00	drizzle	8 °C	0.7 mm	24 %	30 km/h
22:00	light snow	7 °C	7.2 mm	21 %	29 km/h
23:00	overcast	7 °C	0.0 mm	81 %	36 km/h
00:00	light drizzle	5 °C	0.4 mm	81 %	34 km/h
01:00	rain	4 °C	4.0 mm	81 %	37 km/h
02:00	overcast	4 °C	0.0 mm	81 %	34 km/h
03:00	mostly sunny	4 °C	0.0 mm	24 %	30 km/h
04:00	sunny	3 °C	0.0 mm	24 %	28 km/h
05:00	sunny	3 °C	0.0 mm	24 %	29 km/h
06:00	overcast	3 °C	0.0 mm	24 %	27 km/h
07:00	overcast	2 °C	0.0 mm	24 %	25 km/h
08:00	sunny	2 °C	0.0 mm	24 %	24 km/h
09:00	sunny	4 °C	0.0 mm	8 %	21 km/h
10:00	sunny	5 °C	0.0 mm	8 %	22 km/h

Location of Sarnia

Sarnia lies at 185 m, 19 m below the average of the 187 places we cover in Ontario (204 m). That makes it the 80th lowest of the 187. The main town, Toronto, lies 256 km to the east. The nearest places we cover are Corunna (11 km to the south), Camlachie (21 km to the east), Petrolia (23 km to the south-east) and Wallaceburg (43 km to the south). With about 72,125 inhabitants according to GeoNames, Sarnia is the 41st largest of the 187 places we cover in Ontario.