Porsgrunn in Fall
In fall (September, October and November), Porsgrunn sees average daytime highs around 10°C and overnight lows near 4°C, with 315 mm of precipitation over about 37 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 17°C in early September to 3°C by late November. The sky is clear or mostly clear about 23% of the time across fall, and the air most often feels dry.
Fall is Porsgrunn's 3rd-best season to visit on our travel score. For the whole year in context, see Porsgrunn's year-round climate.
- Avg daytime high
- 10°C
- 2nd-warmest season
- Avg overnight low
- 4°C
- Precipitation
- 315 mm
- 37 wet days
- Avg wind
- 11 km/h
- Travel score
- 2.1
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Porsgrunn in Fall
Over the season highs ease from about 17°C in early September to 3°C by late November.
A typical fall day in Porsgrunn reaches about 10°C and drops to 4°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Porsgrunn
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 39 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Porsgrunn weather by month
How the three fall months (September, October and November) 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 Fall
The sky is clear or mostly clear about 23% of the time across fall.
Chance of precipitation in Fall
Porsgrunn gets around 315 mm of rain and snow over 37 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 11 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 54 min in early September to 6 h 24 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 1.4 kWh/m².
Is fall a good time to visit Porsgrunn?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Porsgrunn.
What to pack for Porsgrunn in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Porsgrunn sees daytime highs around 10°C and nights near 4°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 37 days see rain.
Sea temperature near Porsgrunn in Fall
The nearest coast averages about 12°C across fall — 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 Fall
Clear-sky midday UV across fall averages around 1. 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.