Your September weather guide
MildWeather in Prague in September
September is a good time to visit Prague if you want mild weather for exploring on foot, rather than summer heat. Average daytime highs are around 20°C, falling to 11°C at night, so layers matter more than heavy winter clothing. The catch is rain, with about 9 rainy days during the month. For a UK traveller, this is a familiar sort of weather: comfortable when dry, but not a dependable warm-weather break.
Long-term climate averages for Prague, not a forecast · 1991-2020
Prague, month by month
Your snapshot
At a glance
The useful details for Prague.
- Average daytime high
- 19.7°C
- 9 in 10 days stay below 25°C
- Average night-time low
- 10.9°C
- coldest 10% of nights: 7°C or lower
- Compared with London
- +1.1°C
- London averages 18.6°C in September
- Sunshine per day (est.)
- 5.0h
- 41% of 12.3 h of daylight
- Rainy days (1 mm+)
- 9
- 57 mm over the month
- Humidity
- 72%
- Days over 25°C
- 12%
- 1% over 30°C
- Record high 1991-2020
- 32.0°C
- 2015-09-01
- Record low 1991-2020
- 2.3°C
- 2018-09-26
- Flight from London
- ≈ 2 h
- 1035 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Prague and ranks 129th of 134 destinations we compare for September - see where else is hot in September. Against London's average high of 18.6°C in September, Prague is 1.1°C warmer by day and 0.3°C cooler at night.
Daytime and night-time in September
The typical September day in Prague peaks at 19.7°C, but that is an average: the warmest 10% of days reach 25.4°C or more. Roughly 1 in 9 days top 25°C and 1 in 125 pass 30°C. Nights average 10.9°C; one night in ten drops to 6.9°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest September day here reached 32.0°C (2015-09-01) and the coldest night 2.3°C (2018-09-26).
Rain in September
Wet (more than 8 rainy days): about 9 days with 1 mm or more, 57 mm in total. Year to year it varies a lot - the wettest September was 2001 with 110 mm, the driest 2006 with 14 mm. Humidity averages 72%.
Sunshine and daylight
Around 5.0 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:38 and sets about 19:17 local time in mid-September. Average cloud cover is 59%.
Is September a good time to visit Prague?
September is not the strongest month here: mild days and frequent rain. The best months for Prague on our scoring are August, July, June.
Comfortable days, cooler evenings
Prague’s September temperatures suit travellers who prefer walking without strong heat. A light top may be enough during a warmer afternoon, but carry a jumper or light jacket rather than dressing for the daytime high alone. Once you stay out into the evening, the average low of around 11°C makes an extra layer useful. Colder nights can fall to around 7°C or below, so long trousers and closed shoes are sensible packing choices. Warm spells are possible, but they are not the norm. Plan around mild conditions and treat any afternoon warm enough for short sleeves as a bonus, not a promise.
Leave room for rain in your plans
September is not a reliably dry month, so it suits a flexible city break better than a tightly packed outdoor schedule. Bring a waterproof jacket and shoes you are comfortable walking in when pavements are wet. About 5 hours of sunshine a day means there is scope for bright weather, but you should not expect sunshine throughout the roughly 12.3 hours of daylight. Keep your outdoor plans movable and allow for time indoors when rain arrives. The daylight still gives you room to explore without relying on warm evenings; use dry spells when they come rather than saving all your walking for later.
A little perspective
Prague through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|
| January | 3.0°C | -2.4°C | 2.2 | 37 | 10 | 0% |
| February | 5.0°C | -2.1°C | 3.0 | 33 | 8 | 0% |
| March | 9.3°C | 0.7°C | 3.9 | 43 | 11 | 0% |
| April | 14.8°C | 4.4°C | 5.7 | 38 | 9 | 1% |
| May | 19.2°C | 9.2°C | 6.0 | 67 | 13 | 11% |
| Junebest | 22.5°C | 13.0°C | 6.5 | 77 | 12 | 31% |
| Julybest | 24.6°C | 15.1°C | 6.9 | 82 | 13 | 45% |
| Augustbest | 24.8°C | 15.0°C | 6.5 | 73 | 11 | 47% |
| SeptemberSelected | 19.7°C | 10.9°C | 5.0 | 57 | 9 | 12% |
| October | 14.1°C | 6.6°C | 3.4 | 44 | 10 | 0% |
| November | 8.0°C | 2.3°C | 2.1 | 40 | 9 | 0% |
| December | 4.0°C | -1.1°C | 2.0 | 41 | 10 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Prague in September FAQs
Plain answers, grounded in the averages.
Is Prague hot in September?
Prague is mild in September: the average daytime high is 19.7°C and nights average 10.9°C. Roughly 1 in 9 September days reach 25°C.
How much does it rain in Prague in September?
Prague sees about 9 rainy days (1 mm or more) and 57 mm of rain in a typical September. The wettest September between 1991 and 2020 was 2001 (110 mm) and the driest was 2006 (14 mm).
How sunny is Prague in September?
Prague gets around 5.0 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Prague compare with the UK in September?
Prague is on average 1.1°C warmer than London by day in September (19.7°C against 18.6°C).
What is the hottest September on record in Prague?
Between 1991 and 2020 the hottest September day in Prague reached 32.0°C on 2015-09-01, and the coldest night dropped to 2.3°C on 2018-09-26.
Is Prague warmer than London in September?
Slightly. Prague’s average daytime high is 19.7°C, compared with London’s 18.6°C, a difference of 1.1°C. That is not a large enough gap to make Prague feel like a different season, so pack layers rather than expecting a substantial boost in warmth.
Can I expect hot weather in September?
Not reliably. About 12% of days reach 25°C, while only 1% reach 30°C. September is better suited to travellers seeking mild sightseeing weather. If warmth is your priority, June, July and August are the better months to consider.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at Prague. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C