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Best time to go

When is the best time to visit Porsgrunn?

Find the best time to travel to Porsgrunn, Norway, with month-by-month weather, temperatures and precipitation. Also compare the local tourist crowds and the activities to do on-site.

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Check your ideal travel criteria and find the best time to go to Porsgrunn according to your preferences.
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When is the best time to visit Porsgrunn?

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Porsgrunn : best time to go in brief
Most pleasant sea
above 17.6°C
August
Best time to go

Best time to go to Porsgrunn

Our tips and advice for choosing the best time to travel to Porsgrunn.

The maximum temperature in Porsgrunn is on average 10°C over the year, with values generally ranging between -1°C in January and 20°C in July. Precipitation is fairly high, with about 1,121 mm per year. It ranges from 43 mm in April to 123 mm in October.

The climate is suitable for a trip to Porsgrunn in: May, June, July, August and September. Nevertheless, the months when the weather is really pleasant are June, July, August and September.

For swimming, the most favorable period for water temperature is August, with a water temperature above 17.6°C.

However, the best time to fully enjoy the beach and swimming is June, July and August.

For winter sports and snow, the best months are January, February and December.

In terms of crowd levels, the quietest periods are in November and December, while crowding is high in August and July.

Climate

Climate of Porsgrunn, Norway

Temperatures, rain, sunshine and humidity allow you to quickly read the climate month by month in Porsgrunn.

Climate charts in Porsgrunn

Temperatures

Average curve and range between monthly minima and maxima.
Average Min / max

Precipitation

Average monthly rainfall observed each month.
Average rainfall Days with significant precipitation (>5 mm) Days with precipitation

Average daily sunshine

Average sunshine hours per day by month.
Sunshine hours

Relative humidity

Average humidity observed over the months.
Average humidity

What is the climate type in Porsgrunn?

Porsgrunn has a humid continental climate, which is a type of continental climate. More precisely, according to the Köppen-Geiger classification, it is a warm-summer humid continental climate (without dry season) (Dfb).

Activities

What to do in Porsgrunn and the best time to go depending on your interests?

Identify the best times for each travel desire in Porsgrunn and the activities you wish to do there.

Activity calendar

Each dot indicates, month by month, whether conditions are more or less favorable in Porsgrunn.

Very favorable Potentially favorable Unfavourable
Activity Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec.
Winter sports and snow
Beach and swimming
Nature and landscapes
Boat trip and cruise
Visitor numbers

Crowd levels and tourist seasons

Compare the busiest periods and the quieter months to plan your trip to Porsgrunn according to the atmosphere you seek.

Peak crowds
July
High season
August
Mid-season
JanuaryFebruaryMarchAprilMayJuneSeptemberOctober
Quieter period
NovemberDecember
Crowds at a glance

How do visitor numbers change in Porsgrunn?

Visitor numbers in Porsgrunn vary significantly depending on the time of year. The choice of month can therefore really change the atmosphere of the trip: livelier in high season, more relaxed and quieter in low season.

The high season is concentrated mainly in July and August, with more visitors, a livelier atmosphere and often increased demand for accommodations.

To travel with fewer crowds, the months of January, February, March, April, May, June, September, October, November and December are generally the most interesting in terms of crowds.

Updated on 15/09/2026

Visitor index month by month

An index from 0 to 100 to visualize how visitor numbers vary over the year.
Average score
42/100
Nearby

Destinations near Porsgrunn

Compare cities and destinations near Porsgrunn to find an alternative travel time, plan the rest of your stay, or spot an alternative destination.

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Fredrikstad

Frequently asked questions

Best time to go to Porsgrunn: Frequently asked questions

Short answers to the questions we most often ask ourselves before booking.

The best weather conditions in Porsgrunn are concentrated over 4 months: June, July, August and September. It is during this period that the weather is considered good to ideal.

Regarding weather, the least favorable months in Porsgrunn are the following: January, February, March, April, October, November and December. Travel remains possible, but expect less pleasant conditions and a more flexible itinerary.

Precipitation is concentrated mainly in these months: July, August, September, October and November. The peak occurs in October, with about 123 mm of precipitation spread over approximately 6 wet days. Conversely, the driest month is April, with about 43 mm.

The hottest month in Porsgrunn is July, with an average of 20°C during the day and 16°C at night. The coolest is January, with -1°C during the day and -3°C at night.

Swimming is most pleasant when the water temperature exceeds 18°C, that is during these months: August. The peak is reached in August, with about 18°C on average.

The sun is at its most generous in June, with about 16.6 hours of sunshine per day. The darkest month is December, with 4.0 hours per day.

Visitor levels are significantly higher during these months: July and August. For a quieter trip, aim for January, February, March, April, May, June, September, October, November and December. Over the year, the average visitor index is 42/100.

We detail the month-by-month weather of 12 nearby destinations, including Skien, Larvik and Sandefjord. Compare them to build a coherent itinerary: conditions can vary from one city to another, even over short distances.
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