Porsgrunn in Summer
In summer (June, July and August), Porsgrunn sees average daytime highs around 19°C and overnight lows near 11°C, with 299 mm of rain over about 38 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 19°C. The sky is clear or mostly clear about 23% of the time across summer, and the air most often feels dry.
Summer is Porsgrunn's best season of the year to visit on our travel score. For the whole year in context, see Porsgrunn's year-round climate.
- Avg daytime high
- 19°C
- warmest season of the year
- Avg overnight low
- 11°C
- Rainfall
- 299 mm
- 38 wet days
- Avg wind
- 9 km/h
- Travel score
- 5.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Porsgrunn in Summer
Across summer, daytime highs hold fairly steady around 19°C.
A typical summer day in Porsgrunn reaches about 19°C and drops to 11°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Porsgrunn
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Porsgrunn 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 | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 0° / -5° | 92 | 12.2 | 10.3 | 6.6 | 0.0 |
| Feb | 1° / -5° | 62 | 9.3 | 8.4 | 8.8 | 0.0 |
| Mar | 5° / -3° | 63 | 8.7 | 6.6 | 11.3 | 0.2 |
| Apr | 10° / 1° | 59 | 9.4 | 3.5 | 14.1 | 2.1 |
| May | 15° / 6° | 74 | 10.8 | 0.6 | 16.6 | 4.3 |
| Jun | 18° / 10° | 94 | 12.5 | 0 | 18 | 5.5 |
| Jul | 20° / 12° | 99 | 12.5 | 0 | 17.4 | 5.9 |
| Aug | 20° / 12° | 106 | 13.4 | 0 | 15.2 | 5.7 |
| Sep | 15° / 8° | 101 | 11.5 | 0 | 12.6 | 4.4 |
| Oct | 10° / 4° | 107 | 12.5 | 1.5 | 9.8 | 1.9 |
| Nov | 5° / 0° | 108 | 13 | 5.3 | 7.4 | 0.1 |
| Dec | 1° / -3° | 84 | 12.2 | 8 | 5.9 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 23% of the time across summer.
Chance of precipitation in Summer
Porsgrunn gets around 299 mm of rain over 38 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 9 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 17 h 36 min in early June to 13 h 54 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 5.1 kWh/m².
Is summer a good time to visit Porsgrunn?
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 Porsgrunn for sightseeing.
What to pack for Porsgrunn in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Porsgrunn sees daytime highs around 19°C and nights near 11°C. Worth packing: rain gear and sun protection. About 38 days see rain.
Sea temperature near Porsgrunn in Summer
The nearest coast averages about 17°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 30 km away) is warmest in August at about 18°C and coldest in February near 3°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) | 5 | 3 | 4 | 6 | 11 | 15 | 17 | 18 | 15 | 12 | 9 | 6 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 5 | Bracing |
| Feb | 3 | Bracing |
| Mar | 4 | Bracing |
| Apr | 6 | Bracing |
| May | 11 | Bracing |
| Jun | 15 | Bracing |
| Jul | 17 | Cool |
| Aug | 18 | Cool |
| Sep | 15 | Cool |
| Oct | 12 | Bracing |
| Nov | 9 | Bracing |
| Dec | 6 | Bracing |
UV index in Porsgrunn in Summer
Clear-sky midday UV across summer averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Porsgrunn peaks around July 20 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 1 | 2 | 3 | 4 | 4 | 5 | 5 | 3 | 1 | 0 | 0 |
| Level | Low | Low | Low | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 1 | Low |
| Mar | 2 | Low |
| Apr | 3 | Moderate |
| May | 4 | Moderate |
| Jun | 4 | Moderate |
| Jul | 5 | Moderate |
| Aug | 5 | Moderate |
| Sep | 3 | Moderate |
| Oct | 1 | Low |
| Nov | 0 | Low |
| Dec | 0 | Low |
Where is Porsgrunn?
Porsgrunn sits at 59.1°N, 9.7°E, 9 m above sea level, in Norway. The nearest listed city is Skien, 8.0 km away.
Topography around Porsgrunn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Porsgrunn.
Within 3 km, the terrain around Porsgrunn has significant variations in elevation — a maximum elevation change of 254 m around an average of 48 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 548 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,422 m.
The land around Porsgrunn is covered by trees (46%) and artificial surfaces (23%) within 3 km, trees (73%) within 16 km, and trees (59%) and water (31%) within 80 km.
Norway travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 91% of US
- price level, 2025
- GDP per capita
- $94,594
- 2025
- Happiness
- 7.2 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 2.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 613
- Religion
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 Porsgrunn (59.1405°, 9.6561°, elevation 9 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.