Poland Warsaw Weather in September — Climate Guide
September in Warsaw is very-high
Warsaw Weather in September — Quick Answer
As of 2026- Avg temp
- 19° / 9°
- Rainfall
- 50mm · 12 days
- Crowds
- Busy
As of 2026, Warsaw in September averages a high of 19°C and low of 9°C with 50mm of rain over about 12 days. Mild early autumn — around 19°C/9°C (66°F/48°F), warm by day but cool in the mornings and evenings. A light jacket plus layers, and a folding umbrella. One of the most comfortable, balanced months.
September is very-high for Warsaw.
September is one of Warsaw's best months — mild, pleasant days around 19°C/9°C (66°F/48°F), thinning summer crowds, and softer prices. A balanced sweet spot.
The free Sunday Chopin concerts in Łazienki Park run through September — your last chance for the season — and the park starts to show early autumn colour. The Warsaw Autumn festival brings contemporary classical music to the city mid-month.
Travel score
Warsaw September Weather Stats
Avg High
19°C
Avg Low
9°C
Rainy Days
12
50mm total
Sunshine
5.5h
Daily avg
Humidity
76%
comfortable
UV Index
4
Moderate
Wind
12 km/h
Gusts 24
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
19 μg/m³
PM10
34 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
19°C
Nighttime
9°C
Humidity and wind affect how the actual temperature feels.
Wind
12 km/h
Max gust 24 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Mild, comfortable weather
- Last of the free Chopin concerts
- Crowds and prices ease
- Early autumn colour in the parks
Cons
- Cool mornings and evenings
- Shortening daylight
- Occasional showers
- Concerts end after September
September Events & Festivals
- Free Sunday Chopin concerts continue through September (Łazienki)
- Warsaw Autumn international music festival (mid-late September)
- Pleasant shoulder season — crowds and prices ease
- Early autumn colour in the parks
Warsaw in September — Full Picture
September is one of Warsaw's best months — mild, pleasant days around 19°C/9°C (66°F/48°F), thinning summer crowds, and softer prices. A balanced sweet spot.
The free Sunday Chopin concerts in Łazienki Park run through September — your last chance for the season — and the park starts to show early autumn colour. The Warsaw Autumn festival brings contemporary classical music to the city mid-month.
Weather is comfortable, with warm afternoons and cool mornings and evenings. It's a fine time for both outdoor walking — the Vistula, the parks, Wilanów's gardens — and the major museums without peak queues.
Pack a light jacket, layers, and a folding umbrella for the occasional shower. Prices and crowds ease from the summer high. An excellent all-round time to visit.
What to Wear & What to Pack
Mild early autumn — around 19°C/9°C (66°F/48°F), warm by day but cool in the mornings and evenings. A light jacket plus layers, and a folding umbrella. One of the most comfortable, balanced months.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
12.7°C
4°C
12.7/mo
Summer (Jun·Jul·Aug)
23.3°C
13°C
13/mo
Autumn (Sep·Oct·Nov)
Current12.7°C
5°C
13/mo
Winter (Dec·Jan·Feb)
1°C
-3.7°C
15.3/mo
Warsaw Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 0° | -5° | 16d·35mm | 1.5h | 86% | 1 | Quiet | Low season | |
| 1° | -4° | 14d·30mm | 2.5h | 84% | 1 | Quiet | Low season | |
| 6° | -1° | 13d·35mm | 4h | 78% | 3 | Quiet | Low season | |
| 13° | 4° | 12d·35mm | 5.5h | 70% | 4 | Moderate | Shoulder | |
| May (Best) | 19° | 9° | 13d·60mm | 7h | 68% | 5 | Busy | Shoulder |
| June (Best) | 22° | 12° | 13d·65mm | 8h | 68% | 6 | Busy | Peak |
| July (Best) | 24° | 14° | 14d·75mm | 8h | 70% | 7 | Very busy | Peak |
| August (Best) | 24° | 13° | 12d·60mm | 7.5h | 72% | 6 | Very busy | Peak |
| September (Best) | 19° | 9° | 12d·50mm | 5.5h | 76% | 4 | Busy | Shoulder |
| 13° | 5° | 12d·40mm | 3.5h | 82% | 2 | Moderate | Shoulder | |
| 6° | 1° | 15d·40mm | 1.5h | 87% | 1 | Quiet | Low season | |
| 2° | -2° | 16d·35mm | 1h | 88% | 1 | Moderate | Shoulder |
View Other Months
Warsaw September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Warsaw?
Warsaw in September is very-high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Warsaw in September?
Warsaw September averages a high of 19°C and a low of 9°C.
Does it rain much in Warsaw in September?
Warsaw September averages 50mm of rainfall over about 12 rainy days.
What should I wear in Warsaw in September?
Mild early autumn — around 19°C/9°C (66°F/48°F), warm by day but cool in the mornings and evenings. A light jacket plus layers, and a folding umbrella. One of the most comfortable, balanced months.
What time are sunrise and sunset in Warsaw in September?
Warsaw September sunrise is 06:05 and sunset is 18:50, with 12h 45min of daylight.
What's the air quality like in Warsaw in September?
Warsaw September air quality (AQI) averages 46, rated Good. PM2.5 averages 19μg/m³.
What activities are recommended in Warsaw in September?
In September, Warsaw is great for Final free Chopin concerts (Łazienki), Warsaw Autumn music festival, Parks in early autumn colour.
Is September peak season in Warsaw?
Warsaw September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Warsaw
View Other Months
Planning a September trip to Warsaw?
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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.