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Weather in Sarnia for July 2025

Your guide to Sarnia weather in July - trends and predictions
  • In general, the average temperature in Sarnia at the beginning of July is 24.6 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 25.7 °C by the end of July.

  • Sarnia experiences an exceptionally high level of rainfall in July, with more than 20 rainy days on average.

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Average dry days
10
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/17°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
80 %
Avg humidity

Sarnia in July average weather

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Temperatures trend during July in Sarnia

See the weather trend as well as the moving average line

July weather day by day

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Date Weather Temperatures Rain UV More
1 Jul. Patchy rain possible
Patchy rain possible
22° /15° 0.1 mm 6
2 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
23° /15° 7.7 mm 5
3 Jul. Moderate rain at times
Moderate rain at times
25° /17° 1.9 mm 6
4 Jul. Overcast
Overcast
27° /16° 0.7 mm 6
5 Jul. Patchy rain possible
Patchy rain possible
28° /18° 2.9 mm 6
6 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
24° /17° 13.3 mm 6
7 Jul. Sunny
Sunny
23° /16° 0.1 mm 6
8 Jul. Heavy rain at times
Heavy rain at times
25° /17° 2.9 mm 6
9 Jul. Overcast
Overcast
23° /18° 8.3 mm 6
10 Jul. Overcast
Overcast
25° /16° 25.8 mm 6
11 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
24° /17° 9.5 mm 6
12 Jul. Overcast
Overcast
22° /15° 4.8 mm 5
13 Jul. Patchy rain possible
Patchy rain possible
25° /16° 9.3 mm 6
14 Jul. Cloudy
Cloudy
27° /17° 3.3 mm 6
15 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
26° /20° 6.6 mm 6
16 Jul. Patchy rain possible
Patchy rain possible
27° /19° 8.4 mm 6
17 Jul. Overcast
Overcast
23° /17° 0.3 mm 5
18 Jul. Overcast
Overcast
21° /14° 0.3 mm 5
19 Jul. Cloudy
Cloudy
23° /14° 0 mm 6
20 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
25° /16° 4.1 mm 6
21 Jul. Overcast
Overcast
23° /16° 1.1 mm 5
22 Jul. Patchy rain possible
Patchy rain possible
24° /16° 0.5 mm 6
23 Jul. Patchy rain possible
Patchy rain possible
27° /17° 2.4 mm 6
24 Jul. Overcast
Overcast
24° /17° 3.2 mm 6
25 Jul. Overcast
Overcast
25° /16° 0 mm 6
26 Jul. Moderate rain at times
Moderate rain at times
26° /17° 3.8 mm 6
27 Jul. Overcast
Overcast
26° /17° 0.6 mm 7
28 Jul. Patchy rain possible
Patchy rain possible
29° /18° 0.2 mm 7
29 Jul. Moderate or heavy rain shower
Moderate or heavy rain shower
24° /18° 10.9 mm 6
30 Jul. Cloudy
Cloudy
25° /18° 3.4 mm 6
31 Jul. Patchy rain possible
Patchy rain possible
25° /17° 1.9 mm 6
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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.

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 25° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sarnia during July?
Significant rainfall exceeding 145.4 mm is expected in Sarnia during July, occurring over more than 21 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 💧

UV exposure in Sarnia during July

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

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Location coordinates Where is Sarnia?

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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