the first step to avoiding rain is to not go during rainy season.
Take seasonal weather predictions/trends with a grain of salt. I was once chased by cool rainy weather from Honduras to Belize for a week in January. I couldnt take it anymore so invoked weather underground which informed weather in interior Guatemala to be superior thus I departed for parts west. Another time I went to Nicaragua in Sept-Oct and it didnt rain drop one. So there you have it.

I am currently in Guatemala and we are having heavy rains for the next couple of days due to a tropical depression.

Rainy season is overrated. I would not worry about it, but that is good that you are doing a lot of research ahead of time.
If you can, you may want to bring some waterproof hiking boots with you and a light rain jacket. Umbrellas can be purchased from 15 quetzals and up all over the place. You can even get an emergency rain poncho for only 5q or maybe less from many tiny stores if you get caught in a storm unexpectedly. Guatemala does not have monsoons or Noah's Ark type of flooding, for the most part. However, the weather anywhere is unpredictable. South Carolina in the USA just had rain and flooding that was supposedly the worst in a thousand years.

Seal with white background October 19, 2015
The U.S. Embassy reports that the Guatemalan disaster relief agency, CONRED (Coordinadora Nacional para la Reducción de Desastres), has declared an Institutional Orange Alert due to heavy rains and the danger of continued flooding and landslides. The Orange Alert indicates that CONRED is expecting, and prepared to deploy disaster response resources. CONRED advises the public to avoid all travel by road, if not urgent. The low pressure systems in both coastal zones may cause more raining for the next 48 or 72 hours especially for the south, west and central areas of Guatemala. The road between Solola and Panajachel is also experiencing unusually heavy flow in waterfalls which may completely obstruct both lanes and has resulted in several landslides. There has also been a landslide at Km. 39.9 on the road from Antigua towards San Lucas. The Guatemalan Ministry of Education has ordered all public schools closed from October 19 to 23 to protect the safety of the students.
The U.S. Embassy recommends that all U.S. citizens continue to monitor the situation through the CONRED website and local media reports. For up to date reports on traffic conditions in English and Spanish, U.S. citizens may also refer to INGUAT (the Guatemalan Tourist Agency) at http://www.inguat.gob.gt, 2421-2810 or 1500. All U.S. citizens should review their emergency preparedness and keep on hand emergency phone numbers, including the Guatemalan CONRED 24 hour hotline 1566.
For further information:
See the State Department's travel website for the Worldwide Caution, Travel Warnings, Travel Alerts, and Country Specific Information.
Enroll in the Smart Traveler Enrollment Program (STEP) to receive security messages and make it easier to locate you in an emergency.
Contact the U.S. Embassy in Guatemala, located at Avenida Reforma 7-01, Zona 10, Guatemala Ciudad, Guatemala, at +502-2326-4000, 8:00 a.m. – 5:00 p.m. Monday through Thursday and 8:00 a.m. to 12:30 p.m. on Friday. After-hours emergency number for U.S. citizens is +502-2331-2354.
Dang... heck of a day to be arriving. Some of the worst flooding in a while throughout the country and more forecast for the week. Looks like few places left untouched. Maybe a good time to splurge on a fancy hotel in GC and break out the wine and Netflix.
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