Saint Peter Port weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: June – September
What is the weather like in Saint Peter Port in August?
In August, Saint Peter Port is mild: daytime highs average 18 °C, and nights cool down to about 16 °C. The sea averages 17.1 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 49 mm. It is often windy, with gusts of around 30 km/h. All in all, August is an excellent month for a holiday in Saint Peter Port.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 83 | 82 | 76 |
| Day | 17° | 18° | 17° |
| Night | 15° | 16° | 16° |
| Sea | 16° | 17° | 17° |
| Sun | 8 h | 7 h | 6 h |
| Rain days | 7 | 9 | 9 |
More details for August
- Daylight
- 14 h 30 min06:00 – 20:30
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 30 km/haverage daily peakAll months
- Cloud cover
- 57 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/Guernsey
How the score comes together
- Temperatureweight 50 %95 %
- Sunshineweight 20 %73 %
- Few rainy daysweight 30 %67 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
- Windproof jacket
Saint Peter Port in August: quick answers
Is Saint Peter Port hot in August?
No. In August, Saint Peter Port is mild: daytime highs average 18 °C and nights drop to about 16 °C.
Can you swim in Saint Peter Port in August?
Only if you don't mind cold water: in August the sea averages just 17.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Saint Peter Port in August?
Rain falls on about 9 days, adding up to 49 mm.
Saint Peter Port month by month
The whole year in Saint Peter PortAll destinations: GuernseyWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences