Actually I was visiting Berlin already in summer, but I needed really not only summer clothes. I used even jacket for a few days. I was happy to have umbrella with me, but finnaly used it only for a few hours. It looks like weather in Berlin really can change quite often. My suggestion is to take some extra clothing, despite it is summer season.
Photo Equipment: For sure you need photocamera to take photos of all Berlin beauties around.
Pack as you would for any big city. Depending on time of year, slacks, good walking shoes and an umbrella are essential. Long sleeves during the cooler months and short sleeves in the Spring and Summer.
Photo Equipment: Make sure you have plenty of memory for your digital camera
Luggage and bags:
Common questions in the Berlin Forum are; what is the weather like, what should I wear.
I always make a point of using one of the websites available on the internet to check the weather for the duration of my stay. It's common sense. If the forecast is for snow, like my last trip, do not worry. Coming from a country that grinds to a halt after a light snow shower, Berlin was a pleasant surprise. Public transport continues to run and keeps to the timetable. Depending on the amount of snow, roads are continuously cleared and footpaths gritted and frequently cleared. I was amazed by the amount of snow clearance that takes place. Berliners take no notice and just continue their lives as normal.
When it comes to what to wear during snowy weather, layers are always best. Berliners wear practical clothes and do not worry so much about fashion. Hats are common together with scarves,
Clothing/Shoes/Weather Gear: Although weather forecasts are quite reliable, a sudden shower can turn the ways in parks to some muddy slippery experiences. Therefore, check out what you will do on a particular day and be prepared for some showers and have the right weather gear.
Miscellaneous: Please please bring your own bottled water as for some reason in berlin all the bottled water (i even tried starbucks, i know what a let down) has a really weird sweet taste... although some people might like it
Clothing/Shoes/Weather Gear: We thought that June was a warm month in Europe so we packed our shorts and t-shirts but Berlin was still very cold and windy. Be careful as the weather can still be somehow chilly until the very end of the spring.
Make sure to take an umbrella or rain coat when you go to Berlin. For several months in the fall, I had to take mine every time I went out, even if the morning was sunny.
Miscellaneous: Berlin never gets too cold in the winter, but it can stay cold well into the spring. My birthday (mid-April) was chilly, in spite of the bonfire we made.
In case you want to bring any electrical appliances with you, here is the system Germany uses: 220 volts and 50 Hz. It is a round pin attachment plug (see picture)
An adapter will allow you to plug an appliance designed for one type of outlet into another type of outlet. Despite the fact that more than a dozen different types of plugs are in use, a typical travel adapter kit usually contains about five adapters which are capable of dealing with most of the outlets shown here. Adapters often manage this versatility by bypassing the ground/earth wire.
Beware: an adapter by itself will not change the electrical voltage. You must be sure that your appliance can handle different voltages (either automatically or through a voltage switches). If it can't, you will need a voltage converter.
Toiletries and Medical Supplies:
All worldwide baby care companies are present in Berlin but it's always better to bring already used toiletries for a small kid especially.
Photo Equipment: When I was first time in Berlin, in East Berlin more exactly at age 7 or 8 I wanted to have binoculars to watch over the wall towards West Berlin.
Miscellaneous: If you decided to take a small kid with you to Berlin you should bring a pram (baby carriage) with you. Just look at my picture what kind of 3 or 4 wheels prams Berliners use.
Luggage and bags:
For walking around Berlin, small, city backpack and surely bag for your camera - both water-proof (as on my picture).
Clothing/Shoes/Weather Gear: Comfortable walking shoes preferrably water-resistant: like good trainers or better special walking shoes (one example: Danish Ecco are very comfortable and... expensive but worth the cost).
Sun-glasses esp. in winter and summer and always a rain coat, eventually less comfortable umbrella.
Read info on climate in Germany:
Climate of Germany
Average temperatures and rainfall in Berlin:
Check weather (10-day forecast) for Berlin:
Weather forecast for Berlin
Photo Equipment: For pictures at night and bad light (weather) take a tripod.
Books: Until a few months ago all I knew of Germany and Berlin was from history lessons in school. The following books were very useful in preparation for my trip:
Germany & the Germans by John Ardagh
Escape from Berlin by Anthony Kemp
Time Out Berlin Guide
DK Berlin Guide
Comfortable shoes as you'll be walking quite a bit no matter what you plan.
Photo Equipment: A wide-angle lens is always useful in taking photos of buildings.
Miscellaneous: A great guide like Doreen comes in handy. She speaks the local language, can drive in traffic, and is willing to walk around a city looking for what I am trying to find. Just what that is, sometimes I can't even say...until I find it. :)
international impoverished jetset gear: a pastel scarf patterend with purple daisies and shiny plastic handbags. Honestly, I don't know. Everyone seems to wear black, dark black, and gray black, so maybe a little color will make you stand out and bring smiles of endearment/horror/disgust
Toiletries and Medical Supplies: for some reason there's lots and lots of dog poo in Berlin--it's of epic proportions! i have the impression that people are REALLY into their dogs, but I don't remember seeing this much dog poo on the ground anywhere else in Germany. so watch your step!
Photo Equipment: if you take photographs, just remember to burn the negatives and destroy the evidence!
Camping/Beach/Outdoor Gear: as I said in the GERMANY page, you must have an umbrella. since there is no sunlight (jK) you don't need sunglasses, but people wear them anyway (why???) ;)
Miscellaneous: my favorite Berlin guide book was the Time Out! Berlin guide: the maps were great because of the grid system.
Rainy season: There is no special rainy season
Avg. Temp. in Spring: max.: 8 – 21°C ( 47 - 70°F ); min: 2 - 10°C ( 36 - 50°F )
Avg. Temp. in Summer: max.: 22 – 24°C ( 71 - 75°F ); min: 13 - 15°C ( 55 - 59°F )
Avg. Temp. in Autumn: max.: 7 – 19°C ( 45 - 66°F); min: 2 - 11°C ( 36 – 51°F )
Avg. Temp. in Winter: max.: 4 – 6°C ( 39 - 43°F); min: 0 - 1°C ( 32 - 34°F )
See also the following Berlin pages for great descriptions and really original tips:
Berlin by Sabsi
Berlin by Miromi
Berlin by Greentara
Of course, there are many other nice and very useful pages, but these are my favourites!