Warsaw in September
In September, Warsaw averages 18°C (64°F) during the day and 8°C (46°F) at night, with around 9 days of rain (50 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
September is a great month to visit Warsaw: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Warsaw
September is in the middle of the year for warmth in Warsaw (5th of 12) and one of the driest months (10th of 12). Daytime temperature runs 6°C above the annual average (13°C). September runs 6°C cooler than August (24°C) and cools 6°C in October (12°C).
September sunrise & sunset in Warsaw
Times shown for Warsaw local time (Europe/Warsaw), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Warsaw — September
Golden-hour and blue-hour windows for the 15th of September, in Warsaw's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Warsaw in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Warsaw's popularity.
Crowds & pricing — September in Warsaw
This is a busy month in Warsaw — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Warsaw
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Warsaw in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 0°C / 32°F | -5°C / 23°F | 30 mm | 9 | 7 |
| February | 2°C / 36°F | -4°C / 25°F | 25 mm | 8 | 6 |
| March | 7°C / 45°F | -1°C / 30°F | 30 mm | 9 | 3 |
| April | 14°C / 57°F | 3°C / 37°F | 40 mm | 10 | 0 |
| May | 20°C / 68°F | 8°C / 46°F | 55 mm | 11 | 0 |
| June | 23°C / 73°F | 11°C / 52°F | 70 mm | 11 | 0 |
| July | 24°C / 75°F | 13°C / 55°F | 75 mm | 11 | 0 |
| August | 24°C / 75°F | 13°C / 55°F | 65 mm | 10 | 0 |
| September | 18°C / 64°F | 8°C / 46°F | 50 mm | 9 | 0 |
| October | 12°C / 54°F | 4°C / 39°F | 40 mm | 9 | 0 |
| November | 5°C / 41°F | 0°C / 32°F | 40 mm | 10 | 2 |
| December | 1°C / 34°F | -3°C / 27°F | 40 mm | 11 | 5 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Warsaw in September →
Frequently asked questions
How hot is Warsaw in September?
In September, Warsaw averages a high of 18°C (64°F) and a low of 8°C (46°F) — generally mild and pleasant.
Does it rain a lot in Warsaw in September?
September sees occasional rain in Warsaw, with about 9 rainy days on average.
Is September a good time to visit Warsaw?
September is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Warsaw in September?
Pack light layers for warm days and cooler evenings. See the full September packing list for Warsaw for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.