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Weather in Sarnia for July 2026

Your guide to Sarnia weather in July - trends and predictions

    Temperatures

  • So far, July 2026 in Sarnia shows a warmer trend than usual by 3.4 °C.

  • The forecast for the upcoming days in Sarnia predicts a temperature of 27.3 °C, which is slightly above the historical average.

  • In general, the average temperature in Sarnia at the beginning of July is 26.9 °C. As the month progressed, temperatures tended to remain steady, reaching an average of 26.9 °C by the end of July.

    • Rain 🌧️

  • Sarnia experiences heavy rainfall in July, with over 20 rainy days and an average total precipitation 144.5 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
6
Dry days
Average rainy days
25
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/17°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Sarnia Weather July

Move between months or click on a day
June
August
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
27°
2
Moderate or heavy rain shower
28°
3
Moderate rain at times
27°
4
Overcast
28°
5
Patchy rain possible
28°
6
Light rain shower
26°
7
Sunny
24°
8
Patchy rain possible
26°
9
Moderate or heavy rain shower
25°
10
Overcast
24°
11
Moderate or heavy rain shower
26°
12
Overcast
27°
13
Patchy rain possible
28°
14
Cloudy
30°
15
Sunny
29°
16
Patchy rain possible
28°
17
Overcast
25°
18
Overcast
24°
19
Sunny
24°
20
Sunny
30°
21
Patchy rain possible
27°
22
Sunny
22°
23
Sunny
24°
24
Sunny
27°
25
Sunny
29°
26
Sunny
30°
27
Patchy rain possible
29°
28
Sunny
22°
29
Sunny
23°
30
Sunny
25°
31
Sunny
30°

Temperatures trend during July in Sarnia

See the weather trend as well as the moving average line

July weather in Sarnia day by day

Click on a date for more information
June August
Date Weather Temperatures Rain UV More
1 Jul. Patchy rain possible
Patchy rain possible
 27° /18° 3.1 mm 7
2 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
 28° /17° 4 mm 7
3 Jul. Moderate rain at times
Moderate rain at times
 27° /18° 2.7 mm 7
4 Jul. Overcast
Overcast
 28° /17° 1.5 mm 7
5 Jul. Patchy rain possible
Patchy rain possible
 28° /18° 10.9 mm 6
6 Jul. Light rain shower
Light rain shower
 26° /18° 8 mm 7
7 Jul. Sunny
Sunny
 24° /16° 0 mm 7
8 Jul. Patchy rain possible
Patchy rain possible
 26° /16° 1.6 mm 7
9 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /18° 12.3 mm 7
10 Jul. Overcast
Overcast
 24° /17° 14.3 mm 7
11 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /17° 4.7 mm 7
12 Jul. Overcast
Overcast
 27° /17° 31.3 mm 7
13 Jul. Patchy rain possible
Patchy rain possible
 28° /17° 5.5 mm 7
14 Jul. Cloudy
Cloudy
 30° /18° 1.6 mm 7
15 Jul. Sunny
Sunny
 29° /20° 3.3 mm 8
16 Jul. Patchy rain possible
Patchy rain possible
 28° /18° 4.2 mm 7
17 Jul. Overcast
Overcast
 25° /17° 0.2 mm 7
18 Jul. Overcast
Overcast
 24° /16° 2.7 mm 7
19 Jul. Sunny
Sunny
 24° /14° 3.3 mm 7
20 Jul. Sunny
Sunny
 30° /12° 0 mm 7.8
21 Jul. Patchy rain possible
Patchy rain possible
 27° /17° 12.7 mm 7.3
22 Jul. Sunny
Sunny
 22° /14° 0.2 mm 7.6
23 Jul. Sunny
Sunny
 24° /13° 0 mm 7.5
24 Jul. Sunny
Sunny
 27° /16° 0 mm 7
25 Jul. Sunny
Sunny
 29° /19° 0 mm 7
26 Jul. Sunny
Sunny
 30° /18° 0 mm 7
27 Jul. Patchy rain possible
Patchy rain possible
 29° /20° 4.9 mm 7
28 Jul. Sunny
Sunny
 22° /17° 0.9 mm 6
29 Jul. Sunny
Sunny
 23° /15° 0 mm 6
30 Jul. Sunny
Sunny
 25° /15° 0 mm 7
31 Jul. Sunny
Sunny
 30° /16° 0 mm 8
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Important Notice
Our weather forecast for Sarnia in July is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Sarnia forecast closer to your planned date for the most up-to-date weather information.
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Sarnia in July - FAQ

What are the expected maximum and minimum temperatures in Sarnia during July?
During July, expect a variety of temperatures with highs around 26° and lows near 17°, suitable for diverse activities and preferences.

How much rainfall should be expected in Sarnia during July?
Significant rainfall exceeding 144.5 mm is expected in Sarnia during July, occurring over more than 25 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Sarnia during July?
The average wind speed in Sarnia during July is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

July rainfall patterns in Sarnia

Explore the daily rainfall trends and prepare for Sarnias July weather 💧
Typically, Sarnia has 25 rainy days in July with a total of 144.5 mm of rainfall.

UV exposure in Sarnia during July

Stay informed about UV levels for safe outdoor activities throughout the month of July ☀️

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Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.

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