Sarpsborg, Norway — Weather in September 2026

Climate Overview

Sarpsborg, Norway in September has mild conditions, with highs averaging 16.4°C (62°F) and noticeably cooler mornings. Rain falls on about 12 days this month. Sea temperature stays cool at 16.8°C (62°F).

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 19°C (65°F) at the start to 14°C (58°F) by month's end.

September sees fairly even rainfall, totalling about 95 mm across the month.

Expect around 9.4h of sunshine at the start of September, decreasing to 6.0h by the end.

Wind speeds pick up through the month, from 16 km/h (10 mph) to 21 km/h (13 mph).

The warmest days tend to fall around the 1th, averaging 18.6°C (65°F).

Compared to August, this month is about 3°C cooler with 1 fewer rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

16°C / 11°C

Feels Like

15°C / 9°C

Rain

12 days · 94 mm

Sunshine

7.7h / day

Humidity

80% — Very Humid

Wind

19 km/h

Wind Direction

S (187°)

Gusts

40 km/h

Daylight

12.8 h

Cloud Cover

65%

Clear Sky Days

UV Index

3 — Moderate

Sea Temperature

17°C

Dew Point

10°C — Comfortable

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

High Low

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:44

Daylight 12.9h

Sunset 19:36

What to Expect

Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	1°C / -4°C	-4°C / -8°C	11days (71 mm) Wet	2.6h Poor	85% Humid	0.5 Low	Poor	View Details
February	2°C / -3°C	-2°C / -7°C	10days (58 mm) Wet	4.8h Fair	83% Humid	1.1 Low	Poor	View Details
March	6°C / -1°C	1°C / -5°C	9days (50 mm) Wet	7.2h Good	78% Humid	2.3 Moderate	Poor	View Details
April	11°C / 2°C	7°C / -2°C	7days (43 mm) Good	10.4h Excellent	68% Muggy	3.7 Moderate	Fair	View Details
May best	16°C / 8°C	14°C / 5°C	9days (51 mm) Wet	12.5h Excellent	66% Muggy	5.1 High	Fair	View Details
June best	20°C / 12°C	19°C / 11°C	11days (73 mm) Wet	13.4h Excellent	69% Muggy	5.7 High	Good	View Details
July best	21°C / 14°C	20°C / 13°C	12days (92 mm) Wet	13h Excellent	72% Muggy	5 Moderate	Excellent	View Details
August best	20°C / 13°C	18°C / 12°C	13days (91 mm) Wet	10.7h Excellent	77% Humid	4.3 Moderate	Excellent	View Details
September best	16°C / 11°C	15°C / 9°C	12days (94 mm) Wet	7.7h Good	80% Humid	3 Moderate	Good	View Details
October	10°C / 6°C	7°C / 3°C	13days (93 mm) Wet	4.9h Fair	84% Humid	1.5 Low	Poor	View Details
November	5°C / 2°C	2°C / -2°C	12days (78 mm) Wet	2.5h Poor	88% Very Muggy	0.6 Low	Poor	View Details
December	2°C / -2°C	-2°C / -6°C	13days (70 mm) Wet	1.7h Poor	89% Very Muggy	0.3 Low	Poor	View Details

What to Wear

Bundle up with a warm coat, scarf, and closed-toe shoes. Thermal layers underneath give flexibility between indoors and outdoors.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Layered clothingLight jacketUmbrellaWaterproof jacketComfortable walking shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Sarpsborg?

September is typically good for visiting Sarpsborg, with average highs of 16°C (62°F) and around 12 rainy days. Sarpsborg, Norway in September has mild conditions, with highs averaging 16.4°C (62°F) and noticeably cooler mornings. R

Does it rain a lot in Sarpsborg in September?

Sarpsborg typically sees around 12 rainy days in September with 94 mm (3.7 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Sarpsborg in September?

Nights in Sarpsborg during September are cool at around 11°C (51°F). Bring a jacket or sweater for evenings.

What should I pack for Sarpsborg in September?

With highs of 16°C (62°F) and lows of 11°C (51°F) in September, we recommend: Layered clothing, Light jacket, Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Sarpsborg?

Yes, September offers some of the best weather conditions in Sarpsborg with comfortable temperatures and lower chances of rain.

What is the UV index in Sarpsborg in September?

The average UV index in Sarpsborg during September is 3 (moderate). Sunscreen and sunglasses are recommended during midday hours.

How many hours of daylight are there in Sarpsborg in September?

Sarpsborg gets approximately 13 hours of daylight per day in September, with around 8 hours of sunshine.

Does it snow in Sarpsborg in September?

Snow is uncommon in Sarpsborg during September based on 10-year climate averages.

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