St. John's
August
Weather in St. John's for August 2025
Your guide to St. John's weather in August - trends and predictions
In general, the average temperature in St. John's at the beginning of August is 18.7 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 18.9 °C by the end of August.
Expect significant rainfall in St. John's during August, with an average of 17 rainy days.
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14
Dry days
17
Rainy days
0
Snow days
17°/13°
Temperatures
22 km/h
Avg max wind
87 %
Avg humidity
St. John's in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2 19° | 3 20° | ||||
| 4  20° | 5 19° | 6  17° | 7  16° | 8 16° | 9 16° | 10 18° |
| 11 20° | 12 22° | 13 19° | 14 16° | 15 17° | 16 18° | 17 18° |
| 18  19° | 19 17° | 20 22° | 21 20° | 22 17° | 23 16° | 24 17° |
| 25  19° | 26 20° | 27 17° | 28 19° | 29 18° | 30  19° | 31  20° |
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Temperatures trend during August in St. John's
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. | Overcast | 20° /15° | 0 mm | 5 | |
| 2 Aug. | Overcast | 19° /12° | 2.9 mm | 5 | |
| 3 Aug. | Overcast | 20° /12° | 0 mm | 6 | |
| 4 Aug. | Cloudy | 20° /13° | 0.2 mm | 5 | |
| 5 Aug. | Overcast | 19° /14° | 0.1 mm | 5 | |
| 6 Aug. | Moderate or heavy rain shower | 17° /13° | 10.2 mm | 4 | |
| 7 Aug. | Patchy rain possible | 16° /12° | 0.3 mm | 4 | |
| 8 Aug. | Patchy rain possible | 16° /12° | 0.3 mm | 4 | |
| 9 Aug. | Patchy rain possible | 16° /11° | 0.2 mm | 4 | |
| 10 Aug. | Moderate or heavy rain shower | 18° /13° | 7.2 mm | 4 | |
| 11 Aug. | Patchy rain possible | 20° /15° | 4.3 mm | 5 | |
| 12 Aug. | Moderate or heavy rain shower | 22° /16° | 6 mm | 5 | |
| 13 Aug. | Overcast | 19° /13° | 3.6 mm | 4 | |
| 14 Aug. | Patchy rain possible | 16° /12° | 4 mm | 4 | |
| 15 Aug. | Overcast | 17° /11° | 0.9 mm | 5 | |
| 16 Aug. | Patchy rain possible | 18° /12° | 0.3 mm | 5 | |
| 17 Aug. | Overcast | 18° /12° | 0 mm | 5 | |
| 18 Aug. | Partly cloudy | 19° /13° | 0 mm | 6 | |
| 19 Aug. | Moderate rain at times | 17° /14° | 9.3 mm | 4 | |
| 20 Aug. | Moderate rain at times | 22° /15° | 5 mm | 5 | |
| 21 Aug. | Patchy rain possible | 20° /14° | 4.9 mm | 5 | |
| 22 Aug. | Moderate or heavy rain shower | 17° /13° | 15 mm | 4 | |
| 23 Aug. | Moderate or heavy rain shower | 16° /11° | 12.8 mm | 4 | |
| 24 Aug. | Overcast | 17° /13° | 0.6 mm | 4 | |
| 25 Aug. | Sunny | 19° /12° | 0 mm | 6 | |
| 26 Aug. | Overcast | 20° /13° | 0 mm | 5 | |
| 27 Aug. | Partly cloudy | 17° /13° | 5.9 mm | 5 | |
| 28 Aug. | Light rain shower | 19° /14° | 3 mm | 5 | |
| 29 Aug. | Sunny | 18° /12° | 3.5 mm | 5 | |
| 30 Aug. | Moderate rain | 19° /11° | 13.6 mm | 5 | |
| 31 Aug. | Heavy rain | 20° /14° | 83.2 mm | 6 | |
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Important Notice
Our weather forecast for St. John's in August 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 St. John's forecast closer to your planned date for the most up-to-date weather information.
St. John's in August - FAQ
What are the expected maximum and minimum temperatures in St. John's during August?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in St. John's during August?
Significant rainfall exceeding 312.2 mm is expected in St. John's during August, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in St. John's during August?
The average wind speed in St. John's during August is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
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