In Chiang Mai's May to October rainy season, lightning is the real golf hazard, and the rule is simple: walk off at the first thunder or siren, shelter in a proper building, and wait 30 minutes after the last thunder. Storms usually build after lunch, so a 6:30 to 7:30 tee time finishes most rounds before the risk peaks.
We run golf trips here all year. Green season is cheap, lush and quiet, and we recommend it to a lot of golfers. It also has a lightning problem that most booking pages skip. This guide covers how courses handle storms, what the siren means, where to shelter, and how we plan rounds to stay ahead of the weather.
When is lightning season on Chiang Mai golf courses?
Storm risk runs from late April to October, with August the wettest month by rain days and September to October often bringing the heaviest downpours.
Most courses price April to October as green season. The first big storms usually arrive in late April or May, after the hot, smoky stretch covered in our burning season golf guide. From then until October, a thunderstorm is a possibility on most afternoons.
According to WeatherSpark's Chiang Mai International Airport climate data (accessed 2026-10-08), August averages about 18 wet days, against roughly 0.5 in January. That gap is the whole story of Chiang Mai golf seasons.
What time of day do storms hit Chiang Mai golf courses?
Mostly mid-afternoon to early evening. Mornings are usually clear, clouds build over the mountains around midday, and storms tend to break from about 14:00 onward.
These are convective storms. The valley heats up, moist air rises off the hills around Doi Suthep, and cells form fast. A blue sky at 11:00 can turn into a lightning storm by 15:00. Storms can also roll in at night and occasionally in the morning, especially in September and October, so an early tee time lowers the risk without removing it.
For a fuller breakdown of start times by season, see our best tee times in Chiang Mai guide.
| Tee time | Rainy-season storm risk | Heat | Our verdict |
|---|---|---|---|
| 06:30 to 07:30 | Low | Mild | Best slot. Usually finish before clouds build |
| 08:00 to 09:30 | Low to moderate | Warm | Fine, but the back nine can catch early cells |
| 10:00 to 12:00 | Moderate to high | Hot and humid | Avoid. Back nine lands in the storm window |
| 13:00 to 16:00 | High | Hottest | Skip from May to October |
| Floodlit evening | Moderate to high | Cooler | Lovely when clear, but evening storms are common |
What does the lightning siren mean at a Chiang Mai course?
It means stop immediately and get to shelter. Do not finish the hole, do not putt out, and do not wait to see what the storm does.
Most courses we book use a horn or siren from the clubhouse, and caddies carry radios that get the call at the same time. Your caddie will usually know before you do and start driving the cart toward cover. Follow them. Caddies here work through these storms all season and they do not take chances.
Exact signals vary. Some courses use one long blast to suspend play and short blasts to resume. Others rely mainly on caddie radios. Ask at the pro shop when you check in. It takes ten seconds and saves you guessing on the 14th tee.
Where do you shelter on a Chiang Mai golf course?
A clubhouse, halfway house or other enclosed building is best. A fully enclosed car or van is second. Open-sided rain huts and golf carts are not lightning-safe.
This is where many golfers get it wrong. Thai courses have plenty of small roofed rest huts (sala) out on the course. They are great for rain. They are not lightning shelters, because they are open-sided and often sit on raised ground. Golf carts are open too. Use them to get somewhere safe, not as the shelter itself.
Things never to do in a storm:
- Shelter under a lone tree or a tall tree on the fairway edge
- Stand on a tee box, ridge or the top of a raised green
- Hold up a club or an umbrella with a metal shaft
- Stand in or next to water hazards
If you are caught far from the clubhouse, your caddie will take you to the nearest building, usually a halfway house. If none is close, crouch low in a dip away from trees, and keep golfers spread a few metres apart.
Which Chiang Mai courses carry more lightning exposure?
Hilly layouts with long cart rides back to the clubhouse carry more exposure. Flatter courses with buildings close at hand make it easier to reach cover fast.
Chiang Mai Highlands Golf & Spa and Alpine Golf Resort are spectacular in green season, with mountain views and big open fairways. They are also large properties, so some holes are a long cart ride from the clubhouse. Gassan Khuntan sits up in the hills, has one of the longest transfers of the courses we book (45 minutes or more from the old city), and its weather can change faster than in the valley.
Flatter valley courses such as Gassan Legacy and North Hill, which sits closer to town, are easier calls on doubtful days. You lose less time driving in and out, so a short storm costs you less of the day.
Browse the full Chiang Mai golf course directory for layouts and locations.
Is floodlit night golf safe in the rainy season?
It can be, but evening is still storm time. Floodlit rounds at Summit Green Valley, Gassan Legacy or Star Dome need the same walk-off discipline as daytime golf.
Night golf is one of Chiang Mai's best green-season tricks. It is cooler, and Gassan Legacy runs a night rate of ฿1,650 all-in against ฿1,950 by day (CMGT Golf, 2026). Summit Green Valley and in-town Star Dome also play under lights.
The honest downside: storms that break mid-afternoon often drag on into the evening, and lightning is harder to judge after dark, when you cannot see the cell building. If the afternoon was stormy, we often move a night round to the next morning.
How long does a lightning delay last?
At least 30 minutes after the last thunder. In practice, a Chiang Mai afternoon storm often costs 45 minutes to 2 hours, and sometimes ends the round.
The NWS Lightning Safety Toolkit for golf courses (accessed 2026-10-08) allows play to resume after 30 minutes with no detected strikes within about 6 miles (10 km). The rain often stops well before that. Wait anyway. Lightning can strike many kilometres from the rain shaft, before the storm arrives and after it seems to have passed.
After a heavy storm, some courses also close to carts or send players back out cart-path-only while bunkers drain. Low-lying holes can stay soft for a while. Our green conditions guide covers what rainy-season turf plays like.
Do you get a refund when lightning stops play?
Policies vary by course and are rarely written down in English. Caddie fees and tips are normally owed whatever happens, because your caddie has worked.
Some courses give a credit for unplayed holes, especially if you only reached the 3rd or 4th. Others treat the green fee as earned once you tee off. Ask before you pay. Tip your caddie normally, in cash, after the round, and scale it fairly if the round was cut short. Our caddie culture and tipping guide covers the going rates.
How does a package help when storms hit?
A package gives you someone on the ground who can move tee times, try to rebook a washed-out round, and get you off the course in an enclosed private vehicle.
Booking each round direct works fine for one or two rounds, and a single round booked direct can be cheaper. That is a fair trade-off. Where a package earns its keep in green season is the reshuffle. Our team watches the forecast, moves tee times earlier when the afternoon looks dangerous, and talks to the course about credits for interrupted rounds. Your private driver waits in an enclosed van, which is a safe place to sit out a storm. Ride-hailing pickups from remote courses are unreliable in a downpour. For the trade-offs in full, read booking golf direct vs through an agent.
Shorter green-season trips like the Weekend Warrior, 3 nights and 3 rounds, work well because every round can go in the early-morning slot. For a longer trip, the Highlands Classic, 5 nights and 4 rounds, leaves room for a spare morning. Tell us your dates on the CMGT Golf enquiry page and we will reply with a quote built around the weather.
Should you avoid Chiang Mai golf in the rainy season?
No. Green season means lower rates, quieter fairways and lush courses. You trade some afternoon play for that, and you need to respect lightning.
Green-season all-in rates in 2026 run from ฿1,950 at Gassan Panorama to ฿3,700 at Alpine (CMGT Golf, 2026), and tee times are easier to get at short notice. If a dry, storm-free trip matters most, November to February is the answer. Our best time for golf in Chiang Mai guide compares the months. Also check any active flash flood and landslide alerts before driving to mountain courses in September or October.
Plan a storm-smart green-season golf tripEarly tee times, private transfers and a spare morning built in. Enquire for a quote.Frequently asked questions
Is it safe to play golf in Chiang Mai during the rainy season?
Yes, if you plan around the storms. Chiang Mai's rainy season storms are mostly convective. They build in the afternoon, hit hard and usually clear within an hour or two. Mornings are usually dry and playable. Book the earliest tee time you can, aim to finish by early afternoon, and walk off the moment you hear thunder or the course horn sounds. The main risk is lightning, not rain. Golfers on open fairways holding metal clubs are exposed, so treat every thunderclap as a stop signal, whatever the scorecard says.
What happens when a Chiang Mai golf course sounds the lightning siren?
Stop play and get to shelter straight away. Most courses we book sound a horn or siren, and caddies get radio calls from the clubhouse. Your caddie will drive the cart to the nearest enclosed building, usually a halfway house or the clubhouse. Do not finish the hole. Do not shelter under a lone tree. Play resumes only when the course gives the all-clear, which normally follows a wait of at least 30 minutes after the last thunder. Signals and procedures vary by course, so ask about them at check-in.
How long do you wait after thunder before playing again?
At least 30 minutes after the last thunder you hear. That is the US National Weather Service rule, and its golf course toolkit allows play to resume after 30 minutes with no strikes detected within about 6 miles (10 km). A clear sky and stopped rain are not reasons to go back early. Lightning can strike well ahead of and behind the storm cell. In our experience, a typical Chiang Mai afternoon storm costs somewhere between 45 minutes and 2 hours of play, and sometimes ends the round.
Do I get a refund if lightning stops my round in Chiang Mai?
It depends on the course and how many holes you completed. Refund and rain-check policies are not standard across Chiang Mai courses, and few courses publish a written policy in English. Some offer a credit for unplayed holes. Others treat the green fee as earned once you tee off. Caddie fees and caddie tips are normally paid regardless, because your caddie has worked. Confirm the policy at booking. On a CMGT Golf package, we handle the conversation with the course on your behalf and can try to rebook a washed-out round where tee times allow.
Which month has the most storms for golf in Chiang Mai?
August has the most wet days at Chiang Mai airport, averaging roughly 18 days with measurable rain according to WeatherSpark climate data. September and October can bring some of the heaviest afternoon downpours. May and June are shoulder months where storms start building, often with dramatic lightning in the late afternoon. For the lowest storm risk, play November to February, when January averages under one wet day. For green-season prices, book May to October and play early mornings.
