Sarnia
July
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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10
Dry days
21
Rainy days
0
Snow days
25°/17°
Temperatures
18 km/h
Avg max wind
80 %
Avg humidity
Sarnia in July average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2  23° | 3 25° | 4  27° | 5 28° | 6 24° | |
| 7  23° | 8  25° | 9 23° | 10 25° | 11 24° | 12 22° | 13 25° |
| 14  27° | 15 26° | 16 27° | 17 23° | 18 21° | 19 23° | 20 25° |
| 21 23° | 22 24° | 23 27° | 24 24° | 25 25° | 26 26° | 27 26° |
| 28 29° | 29 24° | 30 25° | 31 25° |
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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 | 22° /15° | 0.1 mm | 6 | |
| 2 Jul. | Moderate or heavy rain shower | 23° /15° | 7.7 mm | 5 | |
| 3 Jul. | Moderate rain at times | 25° /17° | 1.9 mm | 6 | |
| 4 Jul. | Overcast | 27° /16° | 0.7 mm | 6 | |
| 5 Jul. | Patchy rain possible | 28° /18° | 2.9 mm | 6 | |
| 6 Jul. | Moderate or heavy rain shower | 24° /17° | 13.3 mm | 6 | |
| 7 Jul. | Sunny | 23° /16° | 0.1 mm | 6 | |
| 8 Jul. | Heavy rain at times | 25° /17° | 2.9 mm | 6 | |
| 9 Jul. | Overcast | 23° /18° | 8.3 mm | 6 | |
| 10 Jul. | Overcast | 25° /16° | 25.8 mm | 6 | |
| 11 Jul. | Moderate or heavy rain shower | 24° /17° | 9.5 mm | 6 | |
| 12 Jul. | Overcast | 22° /15° | 4.8 mm | 5 | |
| 13 Jul. | Patchy rain possible | 25° /16° | 9.3 mm | 6 | |
| 14 Jul. | Cloudy | 27° /17° | 3.3 mm | 6 | |
| 15 Jul. | Moderate or heavy rain shower | 26° /20° | 6.6 mm | 6 | |
| 16 Jul. | Patchy rain possible | 27° /19° | 8.4 mm | 6 | |
| 17 Jul. | Overcast | 23° /17° | 0.3 mm | 5 | |
| 18 Jul. | Overcast | 21° /14° | 0.3 mm | 5 | |
| 19 Jul. | Cloudy | 23° /14° | 0 mm | 6 | |
| 20 Jul. | Moderate or heavy rain shower | 25° /16° | 4.1 mm | 6 | |
| 21 Jul. | Overcast | 23° /16° | 1.1 mm | 5 | |
| 22 Jul. | Patchy rain possible | 24° /16° | 0.5 mm | 6 | |
| 23 Jul. | Patchy rain possible | 27° /17° | 2.4 mm | 6 | |
| 24 Jul. | Overcast | 24° /17° | 3.2 mm | 6 | |
| 25 Jul. | Overcast | 25° /16° | 0 mm | 6 | |
| 26 Jul. | Moderate rain at times | 26° /17° | 3.8 mm | 6 | |
| 27 Jul. | Overcast | 26° /17° | 0.6 mm | 7 | |
| 28 Jul. | Patchy rain possible | 29° /18° | 0.2 mm | 7 | |
| 29 Jul. | Moderate or heavy rain shower | 24° /18° | 10.9 mm | 6 | |
| 30 Jul. | Cloudy | 25° /18° | 3.4 mm | 6 | |
| 31 Jul. | 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.
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