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In terms of precipitation, rainfall in Tumbes ranges from 0.0 - 2.4 inches per month. April is typically the wettest month, when rainfall can reach 2.4 in. May is typically the driest time to visit Tumbes when rainfall is around 0.0 in.
If weather is an important factor for your trip to Tumbes, use this chart to help with planning. For those seeking warmer temperatures, February is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 73.4 F).