Portsmouth
August
Weather in Portsmouth for August 2025
Your guide to Portsmouth weather in August - trends and predictions
In general, the average temperature in Portsmouth at the beginning of August is 19.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 19 °C by the end of August.
Portsmouth experiences an exceptionally high level of rainfall in August, with more than 20 rainy days on average.
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10
Dry days
21
Rainy days
0
Snow days
19°/14°
Temperatures
26 km/h
Avg max wind
79 %
Avg humidity
Portsmouth in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2 20° | 3 21° | ||||
| 4  18° | 5 19° | 6 19° | 7 19° | 8 19° | 9 21° | 10  21° |
| 11 21° | 12 21° | 13 19° | 14  20° | 15 19° | 16 21° | 17 21° |
| 18 21° | 19 19° | 20 20° | 21  19° | 22 20° | 23 21° | 24 20° |
| 25  18° | 26 19° | 27 19° | 28 20° | 29 19° | 30  19° | 31  19° |
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Temperatures trend during August in Portsmouth
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. | Moderate rain at times | 22° /16° | 3.2 mm | 5 | |
| 2 Aug. | Moderate or heavy rain shower | 20° /15° | 5.2 mm | 5 | |
| 3 Aug. | Moderate rain at times | 21° /14° | 1.8 mm | 5 | |
| 4 Aug. | Patchy rain possible | 18° /12° | 0.1 mm | 5 | |
| 5 Aug. | Moderate or heavy rain shower | 19° /14° | 4.2 mm | 5 | |
| 6 Aug. | Patchy rain possible | 19° /13° | 1.1 mm | 5 | |
| 7 Aug. | Patchy rain possible | 19° /13° | 0.3 mm | 4 | |
| 8 Aug. | Patchy rain possible | 19° /13° | 0.7 mm | 4 | |
| 9 Aug. | Patchy rain possible | 21° /15° | 0.2 mm | 6 | |
| 10 Aug. | Partly cloudy | 21° /16° | 0 mm | 6 | |
| 11 Aug. | Patchy rain possible | 21° /17° | 0.3 mm | 6 | |
| 12 Aug. | Patchy rain possible | 21° /16° | 0.9 mm | 5 | |
| 13 Aug. | Patchy rain possible | 19° /15° | 0.2 mm | 5 | |
| 14 Aug. | Heavy rain at times | 20° /15° | 2.9 mm | 5 | |
| 15 Aug. | Patchy rain possible | 19° /14° | 0.1 mm | 4 | |
| 16 Aug. | Patchy rain possible | 21° /15° | 0.7 mm | 5 | |
| 17 Aug. | Patchy rain possible | 21° /14° | 0.2 mm | 6 | |
| 18 Aug. | Heavy rain at times | 21° /15° | 4.3 mm | 6 | |
| 19 Aug. | Patchy rain possible | 19° /15° | 0.7 mm | 5 | |
| 20 Aug. | Patchy rain possible | 20° /15° | 1.9 mm | 5 | |
| 21 Aug. | Sunny | 19° /14° | 0 mm | 5 | |
| 22 Aug. | Patchy rain possible | 20° /16° | 0.5 mm | 5 | |
| 23 Aug. | Partly cloudy | 21° /15° | 0.7 mm | 5 | |
| 24 Aug. | Moderate or heavy rain shower | 20° /14° | 9.7 mm | 5 | |
| 25 Aug. | Cloudy | 18° /13° | 0.3 mm | 4 | |
| 26 Aug. | Light rain shower | 19° /14° | 1.4 mm | 4 | |
| 27 Aug. | Patchy rain possible | 19° /14° | 0.1 mm | 5 | |
| 28 Aug. | Patchy rain possible | 20° /14° | 0.1 mm | 5 | |
| 29 Aug. | Patchy rain possible | 19° /12° | 0.4 mm | 5 | |
| 30 Aug. | Overcast | 19° /12° | 0.2 mm | 5 | |
| 31 Aug. | Moderate rain | 19° /13° | 13.6 mm | 5 | |
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Important Notice
Our weather forecast for Portsmouth 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 Portsmouth forecast closer to your planned date for the most up-to-date weather information.
Portsmouth in August - FAQ
What are the expected maximum and minimum temperatures in Portsmouth during August?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Portsmouth during August?
Moderate rainfall is anticipated in Portsmouth during August, with a total of 80.4 mm spread over approximately 21 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Portsmouth during August?
The average wind speed in Portsmouth during August is 26 km/h, suggesting breezy to windy conditions, depending on your activities.
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