From Marazul guide on travel to Cuba:

Be prepared for hot weather, with a chance of brief periods of rain. However, bring a light jacket or sweater for cool evenings or very cool air conditioned restaurants. From November to June temperatures average around 75 to 85 F. Rainy season is May to October. In general clothing should be on the informal side. If you bring prescription drugs, be sure the druggist's identification label is on the container. Here are some other items to remember when packing: sun screen, extra pair of glasses, sunglasses, sun hat, mosquito repellent and anti itch medicine if going outside of Havana, spanish-english pocket dictionary or phrase book, camera film, alarm clock, tampons, normal medication, plastic bag for soiled clothes, swim suit. I would also add the following: wear shorts and light T-shirts, comfortable walking shoes or sandals, Sony Walkman's are nice. Condoms are difficult to find in Cuba. Even though official rules state no food can be brought in I usually bring in treats like candy bars, crackers with cheese, cookies and gum. We also encourage folks to voluntarily leave behind T-shirts, shoes and shorts as part of our medical donation to the location churches. So now is the time to clean out your drawers of old Charlie Daniel and Saturday Night Fever T-shirts! No suits or ties are worn in Cuba.

 

What to pack? by John Gilderbloom and UCSB Alumni Association

Just a hint: We've provided this list to help you remember the essentials. Don't feel like you have to take everything on this list! Leading travel experts all advise to pack light. This list has been customized for Cuba travel:

Packing Checklist

Clothes:
Underwear
Shirts
T-shirts (bring lots to giveaway to your new Cuban friends)
Belt
Shorts
Socks
Pants
Swimming suit
Skirt (For women)
Shoes (Try to use only comfortable and worn shoes, don't try to break in new shoes on this trip!)
Jogging shoes
Sandals
Cap
Raincoat
Umbrella


For carrying money and important documents(Passport, and Visas)

Pouch for valuable documents
Money belt (maybe)
Fanny pack (comfortable)
Wallet
Purse
day pack (normally folks like to bring with them for walking tours guide book, camera, extra film, water bottle, crackers, notebook, business cards, hat, sunscreen, mosquito spray and small umbrella)

Travel checks/Cash

Receipt for travel checks (Carry separately from your Travel Cheques and keep a copy at home.)
Credit Cards are not accepted from Americans in Cuba (Visa, American Express, Mastercard etc)
Drivers license
ID-card / Copy of Passport (copy can be kept in wallet and original always in Hotel safe).

Optional "documents"

Notepads /Pens
Addresses/ Phone List of friends, doctors and bosses
Photocopies for visas/passports

Addresses to embassies--we provide that when you get your vouchers
Business cards (you will probably give from 25 to 75 away)
Tickets (Airline and hotel vouchers sent to you from Marazu)

Books:

Phrase-book (another highly appreciated gift)
Novels (makes for great gift to your Cuban friends!)
Guidebook (see our list of must read books on our website!)

For Packing Miscellaneous:

Rubber-bands
Plastic bags
Pens
Watch
Flashlight
Iron -don't bring chamber maid will do this
Bungee cords
Swiss army knife-don't bring it will be confiscated at the airport
Water bottle--probably not necessary bottled water sold throughout Cuba
Batteries (for camera and walkman)
Extra shoe laces
Extra glasses (We have had a problem with folks either breaking their glasses or losing them)
Super glue
Safety pins
Sewing kit
Extra buttons
snorkeling mask
Hygiene
Shaving equipment
Toothbrush
Toothpaste
Shampoo & conditioner
Hairspray and any other styling products
Hair dryer
Comb
Hair brush
condoms--quality of American condoms not available in Cuba
Deodorant
Dental floss
Fingernail
clippers
Moisturizer
Feminine hygiene
Mouth wash

Health

Sun protection
Insect repellent
Sunglasses
Band-Aid's
First aid kit (makes a great goodbye gift to a Cuban friend)
Iodine
Lip balm
Pills and tablets
Vitamins
Motion sickness tablets
Fever tablets
Pain relievers
Allergy pills (anti-histamines)
Antacid/ Laxative
IMODIUM Advance (for diarrhea)
Asthma medicine

Photo equipment

Film
Camera
Flash
Camera bag

Music

Walkman
Music cassettes (they make great gifts for your Cuban friends)

Sleeping things

Alarm clock (sometimes the front desk just forgets!)
Sleeping mask
Inflatable neck supporter
Earplugs