Norway Oslo Weather in September — Climate Guide
September in Oslo is high
Oslo Weather in September — Quick Answer
As of 2026- Avg temp
- 17° / 8°
- Rainfall
- 90mm · 11 days
- Crowds
- Busy
As of 2026, Oslo in September averages a high of 17°C and low of 8°C with 90mm of rain over about 11 days. Early autumn — sweater + light jacket + waterproof shell. Daylight shortening to 12-13 hours by month end. Fall foliage begins at Vigeland Park late month.
September is high for Oslo.
September is Oslo's autumn transition + value sweet-spot — high 17°C / 63°F, low 8°C / 46°F. Daylight shortening from 14 hours to 12 hours by month end.
Fall foliage begins late month at Vigeland Park + Frogner Park + the Akerselva river walk in Grünerløkka. Peak foliage early October.
Travel score
Oslo September Weather Stats
Avg High
17°C
Avg Low
8°C
Rainy Days
11
90mm total
Sunshine
5h
Daily avg
Humidity
75%
moderate
UV Index
3
Moderate
Wind
10 km/h
Gusts 28
Sea Temp
14°C
swimming chilly
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
6 μg/m³
PM10
15 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
16°C
Nighttime
7°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 28 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Hotel pricing shoulder season
- Fårikål season starts (canonical Norwegian dish)
- Fall foliage begins late month
- Oslo Opera new season starts
- Daylight still 12-14 hours
Cons
- Variable rain (11 rainy days)
- Daylight shortening
- Cooler evenings 8°C / 46°F
- Late-season Norway in a Nutshell weather variable
September Events & Festivals
- Oslo Opera Season starts
- Higher education year starts (Sep 1, UiO + universities)
- Fårikål season starts (Norway's national dish, lamb-and-cabbage stew)
Oslo in September — Full Picture
September is Oslo's autumn transition + value sweet-spot — high 17°C / 63°F, low 8°C / 46°F. Daylight shortening from 14 hours to 12 hours by month end.
Fall foliage begins late month at Vigeland Park + Frogner Park + the Akerselva river walk in Grünerløkka. Peak foliage early October.
Fårikål season starts — Norway's official national dish (lamb-and-cabbage stew) is the canonical September meal at Restaurant Schrøder + Engebret Café + most traditional Norwegian restaurants. The Norwegian comfort meal of fall.
University of Oslo (UiO) + other universities start fall term September 1 — Sentrum bookstores + Grünerløkka cafes buzz with students. Oslo Opera new season starts at the Snøhetta Opera House.
Weather variable — rain probability still high (11 rainy days). Pack waterproof shell. Norway in a Nutshell day trips operational but check Flåm Railway timetable.
The smart September move: target the last 2 weeks (post-Norwegian-Fellesferie return, pre-fall-foliage peak) for the year's best value pricing on Oslo + canonical fårikål meal.
What to Wear & What to Pack
Early autumn — sweater + light jacket + waterproof shell. Daylight shortening to 12-13 hours by month end. Fall foliage begins at Vigeland Park late month.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
9.3°C
1.3°C
8.7/mo
Summer (Jun·Jul·Aug)
21.7°C
11.7°C
10.7/mo
Autumn (Sep·Oct·Nov)
Current11°C
4°C
11.3/mo
Winter (Dec·Jan·Feb)
-1°C
-6°C
8.7/mo
Oslo Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| -2° | -7° | 9d·50mm | 1h | 80% | 0 | Quiet | Low season | |
| -1° | -7° | 7d·40mm | 2h | 78% | 1 | Quiet | Low season | |
| 3° | -3° | 8d·50mm | 4h | 75% | 2 | Moderate | Shoulder | |
| 9° | 1° | 9d·50mm | 6h | 70% | 3 | Moderate | Shoulder | |
| May (Best) | 16° | 6° | 9d·60mm | 8h | 65% | 5 | Very busy | Peak |
| June (Best) | 20° | 10° | 10d·70mm | 9h | 65% | 6 | Very busy | Peak |
| July (Best) | 23° | 13° | 11d·80mm | 9h | 65% | 6 | Very busy | Peak |
| August (Best) | 22° | 12° | 11d·90mm | 7h | 70% | 5 | Very busy | Peak |
| 17° | 8° | 11d·90mm | 5h | 75% | 3 | Busy | Shoulder | |
| 11° | 4° | 12d·100mm | 3h | 80% | 2 | Moderate | Shoulder | |
| 5° | 0° | 11d·80mm | 1h | 80% | 1 | Quiet | Low season | |
| 0° | -4° | 10d·60mm | 1h | 82% | 0 | Busy | Peak |
View Other Months
Oslo September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Oslo?
Oslo in September is high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Oslo in September?
Oslo September averages a high of 17°C and a low of 8°C.
Does it rain much in Oslo in September?
Oslo September averages 90mm of rainfall over about 11 rainy days.
What should I wear in Oslo in September?
Early autumn — sweater + light jacket + waterproof shell. Daylight shortening to 12-13 hours by month end. Fall foliage begins at Vigeland Park late month.
What time are sunrise and sunset in Oslo in September?
Oslo September sunrise is 06:30 and sunset is 19:30, with 13h 0m of daylight.
What's the air quality like in Oslo in September?
Oslo September air quality (AQI) averages 24, rated Good. PM2.5 averages 6μg/m³.
What activities are recommended in Oslo in September?
In September, Oslo is great for Fårikål at Restaurant Schrøder + Engebret Café, Vigeland Park fall foliage walk late month, Oslo Opera new season.
Is September peak season in Oslo?
Oslo September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Oslo
View Other Months
Planning a September trip to Oslo?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.