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Weather in Sarpsborg - 14-day forecast

Detailed weather forecast for Sarpsborg, Norway: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Sarpsborg
today🌧️ 18°💧 0.5 mm
Sun☁️ 23°💧 0.1 mm
Mon🌧️ 17°💧 9.1 mm
Tue🌧️ 16°💧 2.8 mm
Wed🌧️ 14°💧 19.3 mm
Thu🌧️ 16°💧 5.5 mm
Fri🌧️ 14°💧 3.3 mm
Sat🌧️ 13°💧 2.2 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in Sarpsborg, the forecast high is 23°C. Typical daytime temperatures at this time of year range from 14°C to 18°C, so it will be exceptionally warm. It is warmer than 99% of similar days.

18°Cwarmer than usual
usually 15°C–19°C
warmer than 71% of similar days
night: exceptionally warm rain: typical rainfall wind: exceptionally light
23°Cexceptionally warm
usually 14°C–18°C
warmer than 99% of similar days
night: exceptionally warm rain: less rain than usual wind: exceptionally strong
17°Cnear normal
usually 14°C–18°C
night: exceptionally warm rain: more rain than usual wind: exceptionally strong
16°Cnear normal
usually 14°C–18°C
night: exceptionally warm rain: typical rainfall wind: exceptionally strong
14°Ccooler than usual
usually 14°C–18°C
cooler than 83% of similar days
night: warmer than usual rain: exceptionally wet wind: exceptionally strong
16°Cnear normal
usually 14°C–18°C
night: exceptionally warm rain: more rain than usual wind: stronger than usual
14°Ccooler than usual
usually 14°C–18°C
cooler than 80% of similar days
night: warmer than usual rain: more rain than usual wind: stronger than usual

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
10°18°25° 1981: 18°C1982: 14°C1983: 14°C1984: 14°C1985: 12°C1986: 12°C1987: 15°C1988: 17°C1989: 16°C1990: 16°C1991: 15°C1992: 14°C1993: 14°C1994: 14°C1995: 16°C1996: 13°C1997: 17°C1998: 17°C1999: 19°C2000: 15°C2001: 15°C2002: 19°C2003: 17°C2004: 18°C2005: 17°C2006: 18°C2007: 16°C2008: 14°C2009: 17°C2010: 16°C2011: 16°C2012: 16°C2013: 19°C2014: 18°C2015: 17°C2016: 19°C2017: 14°C2018: 17°C2019: 15°C2020: 16°C2021: 19°C2022: 17°C2023: 20°C2024: 20°C2025: 20°C 2026 forecast: 17°C current forecast 17°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 16°C by day. The coolest year was 1985 (12°C) and the warmest was 2023 (20°C). The current forecast averages 17°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

Weather warnings - Sarpsborg

No active weather warnings for Sarpsborg (region: Østfold). The national weather service is not forecasting dangerous conditions.

14-day forecast - Sarpsborg

Sarpsborg - 14-day weather forecast infographic

Sarpsborg 30 & 45-day weather - long-range outlook

Next 16 days · forecast
17°
around 13° at night · days with rain: 10
Weeks 3-4 · avg for September
17°
around 9° at night · rain chance 48%
Weeks 5-7 · avg for October
11°
around 5° at night · rain chance 53%
The 30 & 45-day outlook for Sarpsborg: the next 16 days are a numerical forecast updated daily - on average 17° by day and 13° at night. Further out we rely on multi-year climate averages: around 17° in September, and about 11° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Sarpsborg

Saturday5 September 2026
🌧️18°light rain
sunrise 06:20 · sunset 20:07 · night 13° · evening 17° · rain 0.45 mm · humidity 69% · wind 2 m/s · clouds 98%
Sunday6 September 2026
☁️23°overcast clouds
sunrise 06:23 · sunset 20:04 · night 14° · evening 18° · rain 0.12 mm · humidity 44% · wind 5 m/s · clouds 85%
Monday7 September 2026
🌧️17°moderate rain
sunrise 06:25 · sunset 20:01 · night 16° · evening 16° · rain 9.07 mm · humidity 87% · wind 6 m/s · clouds 98%
Tuesday8 September 2026
🌧️16°light rain
sunrise 06:27 · sunset 19:58 · night 12° · evening 13° · rain 2.77 mm · humidity 67% · wind 6 m/s · clouds 94%
Wednesday9 September 2026
🌧️14°moderate rain
sunrise 06:29 · sunset 19:55 · night 11° · evening 12° · rain 19.29 mm · humidity 85% · wind 5 m/s · clouds 100%
Thursday10 September 2026
🌧️16°moderate rain
sunrise 06:32 · sunset 19:52 · night 12° · evening 14° · rain 5.49 mm · humidity 57% · wind 4 m/s · clouds 8%
Friday11 September 2026
🌧️14°light rain
sunrise 06:34 · sunset 19:49 · night 12° · evening 13° · rain 3.27 mm · humidity 91% · wind 5 m/s · clouds 100%
Saturday12 September 2026
🌧️13°light rain
sunrise 06:36 · sunset 19:46 · night 11° · evening 11° · rain 2.22 mm · humidity 84% · wind 6 m/s · clouds 100%
Sunday13 September 2026
☁️17°broken clouds
sunrise 06:39 · sunset 19:43 · night 12° · evening 11° · rain 1.71 mm · humidity 41% · wind 4 m/s · clouds 81%
Monday14 September 2026
☁️15°overcast clouds
sunrise 06:41 · sunset 19:40 · night 10° · evening 11° · rain 1.26 mm · humidity 69% · wind 2 m/s · clouds 99%
Tuesday15 September 2026
🌤️15°scattered clouds
sunrise 06:43 · sunset 19:37 · night 14° · evening 14° · rain 2.73 mm · humidity 58% · wind 6 m/s · clouds 38%
Wednesday16 September 2026
🌧️16°light rain
sunrise 06:45 · sunset 19:34 · night 14° · evening 14° · rain 0.15 mm · humidity 80% · wind 6 m/s · clouds 97%
Thursday17 September 2026
🌧️17°light rain
sunrise 06:48 · sunset 19:31 · night 14° · evening 14° · rain 2.76 mm · humidity 83% · wind 6 m/s · clouds 91%
Friday18 September 2026
🌧️16°light rain
sunrise 06:50 · sunset 19:28 · night 16° · evening 16° · rain 0.48 mm · humidity 84% · wind 5 m/s · clouds 100%
Saturday19 September 2026
🌧️19°light rain
sunrise 06:52 · sunset 19:25 · night 16° · evening 17° · rain 0.27 mm · humidity 75% · wind 4 m/s · clouds 99%
Sunday20 September 2026
🌤️20°scattered clouds
sunrise 06:54 · sunset 19:22 · night 15° · evening 15° · humidity 66% · wind 4 m/s · clouds 45%

UV index in Sarpsborg - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTSarpsborg03681111+3.8UV MODERATEtoday, daily maxSeek shade around midday. SPF 30+, sunglasses and ahat for longer stays.Unprotected fair skin may burn in about 55 min4Sat5.094Sun6.094Mon7.093Tue8.093Wed9.094Thu10.091Fri11.093Sat12.092Sun13.093Mon14.092Tue15.093Wed16.092Thu17.093Fri18.093Sat19.093Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Sarpsborg is 4 (moderate) - unprotected fair skin can burn in about 55 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Pollen in Sarpsborg - info for allergy sufferers

PLANT POLLEN · 4-DAY FORECASTSarpsborgHighest pollen today: Ragweed6 grains/m³ · low leveltoday5.09tomorrow6.09Mon7.09Tue8.09Ragweed6161-nonelowmoderatehighvery highoff season: alder, birch, grasses, mugwort, olive · values in grains/m³ (daily peak)pogodapodroze.pl · 2026-09-05
Today ragweed pollen is highest in Sarpsborg - about 6 grains/m³, low level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.

Sea temperature - Sarpsborg

Water today
18°C
Week avg
18°C
Waves today
0.4 m
How's the water?
cold
16-day sea temperature forecast:
5.09 18°C6.09 18°C7.09 18°C8.09 18°C9.09 18°C10.09 18°C11.09 17°C12.09 17°C13.09 16°C
Average sea temperature through the year:
Jan 3°CFeb 2°CMar 4°CApr 8°CMay 14°CJun 18°CJul 20°CAug 19°CSep 17°COct 12°CNov 8°CDec 4°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Sarpsborg weather through the year

Sarpsborg - annual climate

Warmest, driest months on average: May, June, July, August.

Upcoming public holidays in Norway: Christmas Day — 25 December · St. Stephen's Day — 26 December · New Year's Day — 1 January.

Nearby and related places

HaldenLarvikOsloSkienTromsoLillehammerBergen

FAQ - Sarpsborg weather

What is the weather like in Sarpsborg today?
Today it is about 18° during the day and 13° at night, light rain.
How far ahead can I check the forecast for Sarpsborg?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.