A complete guide to Prague weather in September + local tips & what to wear
September is my favourite time to be in Prague – the weather is perfect, the tree colours are starting to change, all attractions are open and there is less people. If you are thinking of visiting Prague in September, then my practical weather tips will help you to plan your trip. I’ve also included my tips on what to wear in September, so that you don’t over-pack!
Is September a good month to visit Prague weather wise?
I would say, most definitely! The weather is much cooler than in July or August, but it’s still warm enough to walk around in shorts and T-shirts most of the time.
I really like that Prague is generally a lot quieter in September and it’s much easier to escape the crowds. The children are back at school (Czech school starts on the 1 September) and most people are back at work after their summer holiday, which means less people all around.
All the must see Prague attractions, museums and castles are still open most weekdays and weekends, as they still run on their summer opening schedule, which is great for visiting. I always use September to visit Czech castles and historic towns on a day trip from Prague, simply because everything is still open, but there are considerably less visitors.
It’s also not as cold as if you were to visit Prague in October, when the weather definitelly changes in to a colder season.
September is officially my favourite month to spend here because you still have relatively long daylight hours to enjoy day trips and hikes in the countryside, but the weather is much more stable. The humidity and dramatic thunderstorms of August usually move on, leaving us with beautiful blue skies and much more reliable walking weather.
What’s the September weather like?
In my experience, Prague and the Czech Republic would have warm autumn, something we also call an ‘Indian Summer’. The temperatures could be as hot as 23 Celsius (or 73 Fahrenheit) in the shade and much warmer on the direct sun.
You might also get the odd shower and storm, much like in the summer, but most of the time the weather is balmy and warm.
Early mornings and late nights are starting to get very cold, so bring an extra layer and make sure you have it with you if you are starting your day early or planning to stay out late at night.
The weather in Prague gets progressively cooler as the month goes on, especially at night and early in the morning. I’ve found that September feels much more settled than August; we have fewer storms and more consistent sunshine. However, I always make sure to have an extra layer ready for those crisp mornings when I’m catching a train out of the city for a hike.
How does the weather change during September in Prague?
September starts off feeling very much like a continuation of August, warm and summery. However, as the month progresses, the mornings become significantly crisper. By the end of the month, you can really feel autumn taking hold.
The biggest difference I’ve noticed over the years is that the ground starts to cool down properly in September. Even if we have a warm day, the nights stay cool, which makes for much better sleep than during the super hot nights of August.
I’ve also noticed, that there is more rain during the later part of September, so I always plan my long trips towards the beginning of the month.
My local tips on how to cope with September weather
While you don’t have to worry as much about the 35 Celsius heatwaves, the sun can still be quite strong during the middle of the day. If you get easily sunburned, I’d still recommend wearing suncream for your afternoon walks.
Because the evenings cool down much faster than in August, this is the perfect time of year to visit our local museums and art galleries in the afternoon. If you are choosing your accommodation, you won’t necessarily need air conditioning, but I still recommend an old 1900s townhouse. The thick walls keep the temperature very steady and comfortable throughout the night.
For me, September evenings are perfect for a stroll through the historic centre with a jumper draped over my shoulders. My favourite way to spend a September afternoon is hiking in the countryside, the air is much better for breathing during an uphill climb than it is in August! You can also still enjoy the pedal boats on the Vltava; the breeze is refreshing and the low autumn sun hitting the National Theatre is just stunning.
Weather temperatures in September
- Average High Temperature: 18°C to 20°C (64°F to 68°F)
- Average Low Temperature: 8°C to 10°C (46°F to 50°F)
- Overall Average Temperature: Around 14.5°C (58°F)
Expect the temperatures to be at their lowest just before dawn. In September, the evenings start to feel quite chilly quite quickly after the sun sets, so while the beer gardens are still open, you’ll definitely want a jacket if you’re sitting out at the Letna Beer Garden.
The average rainfall in September
Prague has a lower average rainfall in September than in August, usually around 40 mm to 50 mm (1.6 to 2 inches). Rain typically falls over about 7 to 9 days.
We don’t get as many sharp storm bursts now; instead, it might be a lighter, more persistent rain if a front moves through. It’s still a great excuse to find a cosy café for a coffee and pastry!
How to predict the rain & the type of rain we usually get
In September, the clouds tend to be flatter and greyer than the purple storm clouds of summer. If the horizon looks hazy and grey, a bit of drizzle is likely on its way, but it rarely lasts long enough to ruin a whole day of sightseeing.
The average sunshine days in September
Prague usually gets about 6 to 7 full sunny days in September, with plenty of partial sun days in between. This sounds like it’s not a lot, but it usually means that the full sun is spread accross many days. For example it might be a bit cloudy in the morning, but lovely and sunny in the afternoon.
I also find that the sun light is much more golden and less harsh than in August, which makes the baroque buildings of Malá Strana look incredible.
How to read the local weather forecast
The local weather forecast uses Celsius and the temperature given is measured in the shade. In September, if the forecast says 18°C, it will feel like a perfect 22°C in the sun, which is ideal for walking or sighseeing. If you see a forecast for 12°C or lower, it’s definitely time to bring out the proper autumn coat.
Day light in September
One of the best things about September is the civilised sunrise! At the start of the month, the sun rises at 6:15 am, but by the end of September, it’s closer to 7:00 am. This means if you want to see the sunrise over an empty Charles Bridge, you don’t need to get up at 4 am!
The sunset is still reasonably late: is at 19.47 pm at the beginning of the month, moving towards the 19.16 by the middle of the month and to 18.43 at the end of September. You also have an extra 40-45 minutes after the sunset when you can easily see and you can carry on exploring the town.
I like that this still means about 12 – 13, 5 hours of day light each day to plan any activities in Prague and of course plenty of daylight to head out of the city. I find September perfect for these trips as the forest walks are cool and the leaves are just starting to turn.
| Date | Sunrise | Sunset | Daylight Duration |
| September 1 | 06:14 | 19:42 | 13h 28m |
| September 10 | 06:27 | 19:22 | 12h 55m |
| September 20 | 06:42 | 18:59 | 12h 17m |
| September 30 | 06:57 | 18:37 | 11h 40m |
What does Prague’s nature look like in September?
In September, the trees green leaves begin to mellow into golds and burnt oranges colours. The rose garden at Petřín Hill is often still flowering, but the parks take on a more peaceful, autumnal feel.
Fruit trees in orchards and Prague vineyards are starting to mature and soon will be ready to harvest.
If you head into the countryside, this is the peak time for apples, pears, plums and wild berries and, if it’s been a damp month, the start of the famous Czech mushroom hunting season!
Mushroom Foraging
If you enjoy foraging like I do, September is a brilliant time to venture out from Prague. If we’ve had a bit of rain, the mushroom picking in the forests outside the city is a great experience. It’s a real Czech national pastime, so don’t be surprised to see people on the trains with big baskets full of wild, but edible mushrooms.
If you want to join in, look out for the prized pravák (porcini) or the lovely golden lišky (chanterelles) tucked under the pine needles. Just remember to follow proper local etiquette: never kick over or destroy mushrooms you don’t recognise, as they belong to the forest ecosystem and always use a small knife to cut the mushroom gently at the base of the stalk rather than pulling it up and damaging the mycelium.
It’s a wonderful, peaceful way to spend an afternoon, and your reward is the most delicious, fresh mushroom soup or smaženice (scrambled eggs with mushrooms) when you get home!
Hay fever allergies
By September, the heavy grass and ragweed pollen of August is finally disapearing.
However, if you are sensitive to late-blooming weeds like mugwort (černobýl) or nettles, which love to colonise the edges of paths and country fields, or if you react to outdoor mould spores as the morning dew lingers longer, keep your antihistamines handy.
As always, if your UK tablets aren’t cutting it, head to a ‘lékárna’ and ask for something for ‘senná rýma’. The local versions are quite inexpensive and I’ve found they really do tackle the specific Czech late-summer weed pollens much better than the ones I used to bring over from London!
What to pack for your visit to Prague in September
- Layers: A mix of t-shirts and long-sleeved tops, plus a proper jumper or fleece.
- Outerwear: A light windproof jacket or a stylish trench coat is perfect for the evenings.
- Footwear: Comfortable trainers are still a must for the cobbles, but you might want to ensure they are somewhat water-resistant in case of a rainy day.
- Accessories: A light scarf or snood/neck warmer is great for September, it’s easy to tuck away during a warm afternoon but a lifesaver once the sun goes down. It also doubles up as a ‘hat’ if needed.
Apart from my general packing advice make sure that you have warmer shoes and second layer (light or mid light jacket) with you.
I also pack short sleeve T-shirt as sometimes during the day it can get very hot. Often (especially if you are travelling at the beginning of September) it’s warm enough to wear summer dress or light linen shirts, trousers or skirts with only a thin summer jacket on top.
I would always carry with me a second thin layer (like a soft hoodie or warm thermal layer with long sleeves) that I can easily put on or take off as I need to.
When I’m wearing a dress or a skirt I also take with me a thin black leggings, that I can wear in the morning and in the evening when it’s a little cooler. I do this especially, if I’m going on a long day trip with getting up super early in the morning and not coming back to Prague until late at night, when it’s always a lot colder.
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September Historic weather data
I’ve been looking back at the records from the Klementinum station, which has been measuring since 1775 and September has seen some truly wild weather swings!
- Warmest September: The absolute record for the warmest average September was set all the way back in 1798, with a monthly mean of 19.4°C. More recently, 2023 was exceptionally warm, shattering records across the country.
- Hottest Day: Just recently, on September 4, 2024, Prague hit a blistering 34°C, marking the warmest September day on record for many weather stations.
- Coldest Day: On the flip side, September 19, 1977, saw an unusually cold day where temperatures struggled to get past 7°C.
- Lowest Overnight Temperature: If you think September is always warm, the Klementinum recorded a chilly 0.7°C on September 27, 1877. More recently, on September 26, 1977, the temperature dropped to 0°C.
This blog post was originally written on 16 May 2026 and last updated on 16 May 2026
