Denmark Copenhagen Weather in September — Climate Guide
September in Copenhagen is very-high
Copenhagen Weather in September — Quick Answer
As of 2026- Avg temp
- 17° / 10°
- Rainfall
- 55mm · 10 days
- Crowds
- Busy
As of 2026, Copenhagen in September averages a high of 17°C and low of 10°C with 55mm of rain over about 10 days. Early autumn layering — tee + light cardigan + light jacket, sneakers, scarf for evenings. Days still hit 17°C but evenings drop to 10°C. Sea swimming still possible (16°C) but limited to mid-day. Pack a compact umbrella + sunglasses. A trench coat is the canonical Copenhagen autumn look.
September is very-high for Copenhagen.
September is Copenhagen's best shoulder-season month — daylight still good (13h), crowds dropping after Korean Chuseok / European summer end, and prices moderating from August peak. Café-terrace weather extends until mid-month with heaters, and the harbor swimming pools at Islands Brygge stay open until late September. The atmospheric peak: golden-hour light at 17:30-18:30 along Nyhavn and Christianshavn canals — September's lower sun angle creates the year's best photography light. Korean Chuseok (varies mid-September) drives a 30% Korean airfare premium for the holiday week.
Travel score
Best shoulder month — golden-hour photography + 10-15% off peak
September Weather at a Glance
September averages 63°F / 17°C highs and 50°F / 10°C lows with 55mm rainfall over 10 wet days. Humidity 78%. Sunshine drops to 5h daily. Daylight contracts from 14.5h to 11.5h across the month — sunset moves from 19:55 to 19:00. Sea temperature 16°C still swimmable mid-day. Lower sun angle creates the year's best golden-hour light (17:30-18:30). First yellow leaves at Frederiksberg Have and Kongens Have late month.
September Travel Advice
Korean Chuseok (varies mid-September) drives Korean airfare premium — avoid the holiday week if you can. Tivoli Gardens close between summer-end and Halloween launch (typically Sep 22 - Oct 13) — confirm dates at tivoli.dk before planning. European Heritage Days mid-September opens many usually-closed historic sites for free — check copenhagenculturalheritage.org. Last warm-weather days for Islands Brygge harbor pool (closes for season end September). Pre-book Noma + Geranium 8+ weeks ahead (still peak for international visitors).
Flying In from Overseas
Shoulder-season recovery from peak summer. Direct flights from Seoul $1,000-1,500 (Korean Air direct), $1,400-2,000 Chuseok week (varies, mid-Sept). Tokyo $900-1,300, Shanghai $800-1,100. From Europe: London $150-350, Paris $180-380, Berlin $130-280. NYC $600-1,100, Toronto $650-1,200. European school holidays end early September. Schengen visa-free.
September Pricing Trends
Shoulder pricing: Hotel d'Angleterre $700-1,200/night, Nimb Hotel $650-1,000, mid-range 4-star $200-340. Flights from Seoul $1,000-1,500. Chuseok week (mid-Sept) flights $1,400-2,000. Best value-for-quality month if you target post-Chuseok last week.
Copenhagen September Weather Stats
Avg High
17°C
Avg Low
10°C
Rainy Days
10
55mm total
Sunshine
5h
Daily avg
Humidity
78%
moderate
UV Index
3
Moderate
Wind
9 km/h
Gusts 25
Sea Temp
16°C
swimming possible
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
16 μg/m³
PM10
28 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
17°C
Nighttime
10°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 25 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- 17/10°C still comfortable + 13h daylight
- Crowds dropping after Korean Chuseok / European summer end
- Cheaper than Jun-Aug (10-15% off peak)
- Sea-temp 16°C still swimmable mid-day
- Golden-hour photography light at peak — Nyhavn + Christianshavn glow
Cons
- Rain 10 days/month + 55mm
- Sunset drops to 19:30 by month-end (-1h vs August)
- Korean Chuseok airfare spike (varies, mid-Sept)
- Tivoli closes between summer + Halloween launch
- Café terraces close late month as evenings cool
September Events & Festivals
- Korean Chuseok (varies, mid-Sept, Korean Thanksgiving)
- Copenhagen Cooking Week wraps mid-month
- Tivoli Halloween prep begins late month (full launch mid-October)
- European Heritage Days mid-September (free entry to many usually-closed sites)
Copenhagen in September — Full Picture
September is Copenhagen's best shoulder-season month — daylight still good (13h), crowds dropping after Korean Chuseok / European summer end, and prices moderating from August peak. Café-terrace weather extends until mid-month with heaters, and the harbor swimming pools at Islands Brygge stay open until late September. The atmospheric peak: golden-hour light at 17:30-18:30 along Nyhavn and Christianshavn canals — September's lower sun angle creates the year's best photography light. Korean Chuseok (varies mid-September) drives a 30% Korean airfare premium for the holiday week.
What to Wear & What to Pack
Early autumn layering — tee + light cardigan + light jacket, sneakers, scarf for evenings. Days still hit 17°C but evenings drop to 10°C. Sea swimming still possible (16°C) but limited to mid-day. Pack a compact umbrella + sunglasses. A trench coat is the canonical Copenhagen autumn look.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
11°C
3.3°C
8.7/mo
Summer (Jun·Jul·Aug)
20.3°C
12.3°C
10.3/mo
Autumn (Sep·Oct·Nov)
Current12°C
6.3°C
11/mo
Winter (Dec·Jan·Feb)
3.3°C
-1.3°C
10/mo
Copenhagen Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 3° | -2° | 11d·50mm | 1h | 88% | 1 | Quiet | Low season | |
| 3° | -2° | 8d·30mm | 2h | 85% | 1 | Quiet | Low season | |
| 6° | 0° | 9d·35mm | 4h | 80% | 2 | Quiet | Shoulder | |
| 11° | 3° | 9d·35mm | 6h | 75% | 3 | Moderate | Shoulder | |
| May (Best) | 16° | 7° | 8d·40mm | 8h | 70% | 4 | Busy | Peak |
| June (Best) | 19° | 11° | 10d·50mm | 9h | 70% | 5 | Very busy | Peak |
| July (Best) | 21° | 13° | 10d·70mm | 8h | 70% | 5 | Very busy | Peak |
| August (Best) | 21° | 13° | 11d·75mm | 7h | 73% | 5 | Very busy | Peak |
| 17° | 10° | 10d·55mm | 5h | 78% | 3 | Busy | Peak | |
| 12° | 6° | 11d·60mm | 3h | 82% | 2 | Moderate | Shoulder | |
| 7° | 3° | 12d·65mm | 1h | 87% | 1 | Moderate | Shoulder | |
| December (Best) | 4° | 0° | 11d·55mm | 1h | 88% | 1 | Very busy | Peak |
View Other Months
Copenhagen September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Copenhagen?
Copenhagen in September is very-high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Copenhagen in September?
Copenhagen September averages a high of 17°C and a low of 10°C.
Does it rain much in Copenhagen in September?
Copenhagen September averages 55mm of rainfall over about 10 rainy days.
What should I wear in Copenhagen in September?
Early autumn layering — tee + light cardigan + light jacket, sneakers, scarf for evenings. Days still hit 17°C but evenings drop to 10°C. Sea swimming still possible (16°C) but limited to mid-day. Pack a compact umbrella + sunglasses. A trench coat is the canonical Copenhagen autumn look.
What time are sunrise and sunset in Copenhagen in September?
Copenhagen September sunrise is 06:30 and sunset is 19:32, with 13h 1min of daylight.
What's the air quality like in Copenhagen in September?
Copenhagen September air quality (AQI) averages 45, rated Good. PM2.5 averages 16μg/m³.
What activities are recommended in Copenhagen in September?
In September, Copenhagen is great for Tivoli closing weekend + Halloween prep launch late month, Nyhavn + Christianshavn golden-hour photography (17:30-18:30), Last Islands Brygge harbor pool sessions of year.
Is September peak season in Copenhagen?
Copenhagen September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Copenhagen
View Other Months
Planning a September trip to Copenhagen?
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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.