Asian arowana at a pay-lake are available twelve months of the year — the venues never close, the fish are always present, and you do not need to time a migration or a monsoon. But timing still matters. Water temperature shapes arowana behaviour more than any other single variable, and Thailand's seasonal temperature swings are wide enough to produce meaningfully different fishing across the calendar.
The Short Answer
For surface aggression and the most visual, exciting fishing, book a session between March and May when water temperatures are climbing toward their annual peak. For value and quieter venues, the cool season from November to February offers decent sub-surface action with fewer anglers. The wet season midpoint — July and August — sees the lakes at their fullest and arowana at their most unpredictable.
How Water Temperature Drives the Fish
Arowana are ectotherms. Their metabolism, digestion rate, and willingness to chase a lure all track water temperature closely. In Thailand's pay-lakes, where water depths are moderate and the tropics ensure that temperature swings are compressed compared to temperate climates, the differences between seasons are real but not extreme.
The range that matters runs roughly from 26°C in the coolest months to 33–34°C at the height of the pre-monsoon. Arowana feed across this entire range, but their preferred feeding depth and strike aggressiveness shift noticeably at either end.
Pre-Warm Months: March to May
This is the premium window for surface fishing. As the dry season tips into the pre-monsoon heat, lake surface temperatures climb quickly. Arowana respond by patrolling the top metre of the water column more aggressively and becoming willing to chase lures across longer distances.
The hour after sunrise in April is arguably the single best window in the Thai calendar for arowana on surface lures. Light is low, temperatures are rising, and the fish are actively hunting.
April in particular combines warm water, low rainfall, and long, clear dawns. Poppers, walk-the-dog stickbaits, and large glide baits worked slowly across calm surface water will draw strikes that are hard to forget — the arowana's surface take is one of the most dramatic in freshwater fishing. May extends this window before the first monsoon rains arrive, though by late May heat can suppress midday activity even as dawn sessions remain excellent.
Cool Season: November to February
The cool season in Thailand — loosely November through February — brings lower humidity, blue skies, and water temperatures that can drop into the high 20s at some venues, particularly in the north and at altitude. This is excellent weather for spending a day lakeside, but arowana shift their behaviour.
In cooler water, fish sit lower in the water column and are less likely to commit to a fast surface presentation. The adjustment is straightforward: slow down. Sub-surface swimmers, soft plastics worked on a slow sink-and-twitch retrieve, and natural baits fished at depth will pick up fish that would ignore a popper. Sessions can be slower, but the fish are there.
"In the cool season, arowana become a test of patience. Slow the lure, extend the pauses, and fish lower in the water column — the strikes come eventually, and they are worth the wait."
Wet Season: June to October
The monsoon period brings heavy rainfall, rising lake levels, and often coloured water. Arowana continue to feed throughout the wet season, but fishing becomes less predictable. The influx of surface colour can make visual hunting — spotting fish before casting — more difficult. Natural baits tend to outperform lures when water clarity drops.
That said, the wet season is not without its advantages. Some anglers find that post-rain windows, particularly the two hours after a heavy shower clears, produce excellent activity as barometric pressure stabilises and insects fall onto the surface. September and October can deliver surprise sessions as the rains ease and temperatures begin their slow descent.
Time of Day: The Constant Variable
Regardless of season, arowana fishing at pay-lakes follows a consistent daily rhythm. Dawn is the most productive window across the calendar — fish are active from first light and feed aggressively through the first two hours of morning. The late afternoon into dusk is the second-best window.
Midday from roughly 10 a.m. to 3 p.m. is the most challenging period during the hot months. Fish retreat to deeper, cooler water and become far less responsive. Use this window to rest, change locations, or experiment with bottom baits.
Venue-Specific Advice
Water temperature and behaviour can vary between lakes at the same venue depending on depth, shade cover, and water source. Always ask lake staff when you arrive which section of the water is currently producing and at what depth. Staff at established venues like Gillham's Fishing Resort, IT Lake Monsters, and Palm Tree Lagoon will have current intelligence that no seasonal guide can replace.
For the full species profile, conservation background, and tackle recommendations, visit our Asian arowana species page.
