Saint Peter Port in Summer
In summer (June, July and August), Saint Peter Port sees average daytime highs around 16°C and overnight lows near 15°C, with 128 mm of rain over about 23 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 14°C in early June to 17°C by late August. The sky is clear or mostly clear about 36% of the time across summer, and the air most often feels comfortable.
Summer is Saint Peter Port's best season of the year to visit on our travel score. For the whole year in context, see Saint Peter Port's year-round climate.
- Avg daytime high
- 16°C
- warmest season of the year
- Avg overnight low
- 15°C
- Rainfall
- 128 mm
- 23 wet days
- Avg wind
- 22 km/h
- Travel score
- 5.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Saint Peter Port in Summer
Over the season highs climb from about 14°C in early June to 17°C by late August.
A typical summer day in Saint Peter Port reaches about 16°C and drops to 15°C overnight. The warmest of the three months is August, the coolest June.
Saint Peter Port weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 10° / 8° | 98 | 15.7 | 8.4 | 1.8 |
| Feb | 9° / 7° | 74 | 13.3 | 9.8 | 1.7 |
| Mar | 10° / 8° | 58 | 11.5 | 11.5 | 2.0 |
| Apr | 11° / 9° | 50 | 9.7 | 13.4 | 2.6 |
| May | 13° / 11° | 45 | 7.9 | 15.1 | 3.6 |
| Jun | 15° / 13° | 42 | 7.5 | 16 | 4.7 |
| Jul | 17° / 15° | 36 | 6.9 | 15.6 | 5.7 |
| Aug | 17° / 16° | 50 | 8.6 | 14.2 | 5.9 |
| Sep | 17° / 15° | 57 | 9.4 | 12.4 | 5.5 |
| Oct | 15° / 14° | 107 | 15 | 10.5 | 4.1 |
| Nov | 13° / 11° | 121 | 17.7 | 8.9 | 2.8 |
| Dec | 11° / 9° | 121 | 17 | 8 | 2.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 36% of the time across summer.
Chance of precipitation in Summer
Saint Peter Port gets around 128 mm of rain over 23 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 22 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 42 min in early June to 13 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.9 kWh/m².
Hazard calendar for Saint Peter Port
None of Saint Peter Port's seasonal hazards peak in summer. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Saint Peter Port's rainy season runs September–March, when most of the year's rain falls.
Is summer a good time to visit Saint Peter Port?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Saint Peter Port for sightseeing.
What to pack for Saint Peter Port in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Saint Peter Port sees daytime highs around 16°C and nights near 15°C. Pack sun protection. Worth having: a warm layer, rain gear and a windbreaker. About 23 days see rain.
Sea temperature near Saint Peter Port in Summer
The nearest coast averages about 15°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in September at about 17°C and coldest in March near 9°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 10 | 10 | 9 | 10 | 12 | 14 | 16 | 17 | 17 | 16 | 14 | 12 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 10 | Bracing |
| Feb | 10 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 12 | Bracing |
| Jun | 14 | Bracing |
| Jul | 16 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 16 | Cool |
| Nov | 14 | Bracing |
| Dec | 12 | Bracing |
UV index in Saint Peter Port in Summer
Clear-sky midday UV across summer averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint Peter Port peaks around August 12 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 5 | 6 | 6 | 6 | 7 | 5 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 5 | Moderate |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 7 | High |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Saint Peter Port?
Saint Peter Port sits at 49.5°N, 2.5°W, 10 m above sea level, in Guernsey. The nearest listed city is Saint Helier, 43 km away.
Topography around Saint Peter Port
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint Peter Port.
Within 3 km, the terrain around Saint Peter Port has only modest variations in elevation — a maximum elevation change of 105 m around an average of 24 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 108 m; within 80 km, only modest variations in elevation — a maximum elevation change of 191 m.
The land around Saint Peter Port is covered by water (41%) and trees (25%) within 3 km, water (91%) within 16 km, and water (88%) within 80 km.
Guernsey travel facts
- Power plugs
- Type G
- 230 V · 50 Hz
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Saint Peter Port (49.4598°, -2.5353°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.