Guernsey Weather in August
Guernsey in August sees pleasant temperatures, with highs around 19°C (66°F) and overnight lows of 16°C (61°F). Around 56 mm (2.2 in) of rainfall is typical, so a light rain jacket is a sensible addition to your bag.
Rainfall in Guernsey in August
You can typically expect 11 days of rain this month, averaging around 56 mm (2.2 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Guernsey in August
If you're visiting Guernsey in August, expect highs of 19°C (66°F) and overnight lows around 16°C (61°F). The difference between afternoon and evening temperatures is usually noticeable. Nights drop to around 16°C (61°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. On average, it is the month with the highest temperature of the year.
Sunshine in Guernsey in August
With approximately 232 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If you're a fan of comfortable temperatures and drier conditions, August is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Guernsey's climate page.
Guernsey Temperature in August
Min Temperature
16°C (61°F)
Max Temperature
19°C (66°F)
Chance of Rain
37%
Precipitation
56 mm (2.2 in)
Rainy days
11 days
Sunshine
232 hours
Percentage Sunshine
52%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Guernsey typically stay consistent throughout August, with daily highs averaging around 19°C (66°F). Nights are pleasant, with lows around 14°C (57°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Guernsey in August
Browse day-by-day weather records for Guernsey spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Guernsey historical weather extremes in August
The extremes listed below come from historical weather data collected in Guernsey from 1976 through 2025.
- On August 9, 2003, temperatures climbed to 34°C (93°F), marking the warmest August day on record.
- On August 3, 1986, Guernsey saw its coldest August day with temperatures maxing out at 14°C (57°F).
- Nighttime temperatures dropped to 10°C (50°F) on August 20, 1986, marking the coldest August night on record.
Best Places in the United Kingdom in August
Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month. See all of the United Kingdom in August →
perfect weather
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tolerable
unpleasant
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What to Wear in Guernsey in August
Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Guernsey in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Guernsey's climate page.
See the full Guernsey climate overview or explore weather in the United Kingdom.
