← Weather & seasons in Thailand
On the thirty-year normal, Khon Kaen’s driest month is December (5.1 mm — the lowest single-month figure of any station in our twelve-city comparison) and its coolest is January (18.1°C mean daily minimum, milder than Udon Thani's own January). Wettest is September (246.0 mm) and hottest is April (36.2°C mean daily maximum). Like Udon Thani, the province's sugarcane harvest and burn season runs through the early months of the year — see the honest gap below on exact 2026 dates.
The season bands, honestly
Khon Kaen and Udon Thani share Isaan's broad climate pattern but differ in the specifics. The bands below are built from the four extreme months in the thirty-year normal, not a full monthly table.
| Window | Measured conditions | What that means here |
|---|---|---|
| Dec | Driest month (5.1 mm) — the lowest single-month figure of any station in our twelve-city climate set, edging out even neighbouring Udon Thani's own December (5.8 mm). | The clearest dry-season marker on the whole comparison table. |
| Jan | Coolest month (18.1°C mean daily minimum) — milder than Udon Thani's own January (16.7°C). | Cool by Thai standards, but not as cold as the province just up the road. |
| Feb – Apr | Isaan's sugarcane harvest and burn season. | PM2.5 risk period regionally — see the honest gap below on why we can't give Khon Kaen-specific 2026 ban dates. |
| Apr | Hottest month (36.2°C mean daily maximum) — third-hottest of twelve stations, behind Chiang Mai and Udon Thani. | Falls at the tail of the burn-season window; Songkran lands mid-month. |
| May – Aug | Rain building. | The wet season lengthens gradually through the middle of the year. |
| Sep | Wettest month (246.0 mm). | The peak of the rainy season. |
| Oct – Nov | Rain easing. | Shoulder season heading back toward the December dry spell. |
All figures are 1991–2020 normals for WMO station 48381 (Khon Kaen). The “what that means here” column is our own reading against the region's sugarcane calendar and the other eleven stations in our comparison, not a separate data source.
The Isaan burn season here, and Khon Kaen's own identity beyond it
As with Udon Thani, we looked for a province-specific 2026 open-burning ban order for Khon Kaen with named dates, in the style of Chiang Mai and Chiang Rai's published windows, and could not find one from an official source. What we can confirm is the pattern, not a date range: the national Cabinet's 2026 PM2.5 plan, approved 10 February 2026, names the Northeastern region as a designated risk area, and Thailand's own Public Relations Department documented real enforcement locally the most recent season we could verify in detail — 11 prosecutions filed across eight Khon Kaen districts (Mueang Khon Kaen, Kranuan, Pho, Ban Phaeng, Mueang Chalee, Sikhio Phum, Chumphae and Nam Phong) in a four-day span in late January 2025, for burning grass, straw and sugarcane fields.
Khon Kaen's identity outside the burn season is genuinely different from Udon Thani's border-gateway role: it's Isaan's largest education and MICE hub, anchored by Khon Kaen University, which the university's own materials place among Thailand's top institutions — ranked #7 in Thailand by both Times Higher Education's 2026 rankings and the QS World University Rankings' 2027 edition, and approaching its 60th anniversary.
Why April is the month to plan around
April is Khon Kaen’s hottest month on the thirty-year normal, at a 36.2°C mean daily maximum — hotter than Bangkok's own April peak (35.7°C), and the third-hottest of the twelve stations in our comparison, behind Chiang Mai (36.7°C) and Udon Thani (36.5°C). It falls at the tail of the burn-season window described above, with Songkran landing mid-month.
What we could not confirm
- A province-specific 2026 open-burning ban order for Khon Kaen, with named start and end dates, of the kind Chiang Mai and Chiang Rai have published. Not found from an official source in this run.
- A full monthly rainfall or temperature table beyond the four extreme months. The archive that would supply every other month could not be reached from this run.
- Khon Kaen University's exact founding year and current student enrollment. The university's own site references a 60th-anniversary publication without stating the founding year explicitly, and does not give a total enrollment figure on the page we could access, so neither is printed here as a hard number.
Frequently asked questions
As with Udon Thani, there's no one clean month — December is driest (5.1 mm) and January is coolest (18.1°C mean daily minimum), two different months. Khon Kaen's January is noticeably milder than Udon Thani's own (16.7°C), so if a gentler cool season matters more than the driest possible air, January edges it here.
Yes. At 5.1 mm, Khon Kaen's December normal is the lowest single-month rainfall figure of the twelve Thai stations in our comparison — lower than Udon Thani's own December (5.8 mm), and far below coastal stations like Hua Hin (11.9 mm in December) or Chiang Mai (9.6 mm in February).
Yes — Khon Kaen reported 2,348.1 hours of annual sunshine in the WMO 1991–2020 normals, one of only four of the twelve stations in our comparison to report a sunshine-duration series at all (the others are Chiang Mai, Chiang Rai and Rayong). Udon Thani's submission, like six other stations, reported no sunshine series.
We could not confirm a province-specific 2026 ban order for Khon Kaen with named dates, the same honest gap as our Udon Thani page. What we can confirm: the national Cabinet's 2026 PM2.5 plan names the Northeastern region as a designated risk area, and Thailand's own Public Relations Department documented real enforcement in Khon Kaen the most recent season we could verify in detail — 11 prosecutions across eight districts in a four-day span in late January 2025, for burning grass, straw and sugarcane fields.
It's Isaan's largest education and MICE (meetings, incentives, conferences, exhibitions) hub, anchored by Khon Kaen University — ranked #7 in Thailand by both Times Higher Education's 2026 rankings and the QS World University Rankings' 2027 edition, and, per the university's own materials, approaching its 60th anniversary.
Related guides
- Best time to visit Udon Thani — the neighbouring Isaan hub, same burn-season pattern, different distinguishing facts.
- Air quality in Thailand — the PM2.5 standard and how the north's and northeast's burn seasons compare.
- Compare Thai cities — the same normals for twelve stations, side by side.
- Khon Kaen air quality — what is tracked locally.
- Khon Kaen — the city guide.
- Explore Thailand — the section this guide sits in.
Timed your visit. Now time the move.
If Khon Kaen is more than a trip, see what is actually listed here before the next burn season sets your calendar.
Sources & References
- WMO Climatological Standard Normals 1991–2020 — Thailand station data sheets (NCEI Accession 0253808), Khon Kaen station 48381: annual rainfall of 1,231.4 mm over 84.0 rain days, wettest month September (246.0 mm), driest month December (5.1 mm) — the lowest single-month figure of any of the twelve Thai stations in our climate comparison — hottest month April at a 36.2°C daily-maximum mean, coolest month January at an 18.1°C daily-minimum mean, annual sunshine 2,348.1 hours
- Khon Kaen University official site: ranked #7 in Thailand by both Times Higher Education (2026 edition) and the QS World University Rankings (2027 edition); site materials reference the university's 60th-anniversary book, placing its founding in the mid-1960s without stating the exact year
- Public Relations Department, Government of Thailand — enforcement report covering 26–29 January 2025 (B.E. 2568): Khon Kaen provincial officials filed 11 prosecutions across multiple districts (Mueang Khon Kaen, Kranuan, Pho, Ban Phaeng, Mueang Chalee, Sikhio Phum, Chumphae and Nam Phong) for burning grass, straw, garbage and sugarcane fields, charged under traffic-safety, agricultural-burning and provincial-governor-order violations
- Thai PBS — "ครม.เห็นชอบมาตรการรับมือไฟป่า หมอกควัน ฝุ่น PM 2.5 ปี 2569" (published 10 February 2026): the Cabinet approved 2026 measures controlling pollution sources across forest, agricultural and urban zones, naming the Northeastern region among the country's designated risk areas; no province-specific ban dates are given in this national-level approval
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
