Ecuador's equatorial location means no true seasons—only wet/dry patterns that vary dramatically by region. The "best time" depends entirely on where you're going.
June–September (dry season): Sunny mornings, afternoon clouds, minimal rain. Ideal for hiking, markets, city exploration. Shoulder (Oct–Nov, Mar–May): Mix of sun and showers, fewer crowds, greener landscapes.
June–November (garúa/cool season): Humboldt Current brings nutrient-rich water, abundant marine life, cooler temps (21–24°C / 70–75°F), misty mornings. Best for diving, wildlife activity. December–May (warm/wet): Warmer water (24–28°C / 75–82°F), calmer seas, brief daily rains, land species breeding. Best for snorkeling, photography.
Year-round rain. Wetter (Mar–Jul): Higher rivers, better canoe access, more wildlife at clay licks. Drier (Aug–Feb): Lower rivers, more trails, fewer mosquitoes. Both rewarding.
December–April: Sunny, warm, humpback whales (Jun–Oct). May–November: Cloudier, cooler, less crowded.
Bottom line: No bad time. Pick your region, then your season.