295 places · sun position · panel angle
Solar data for Thailand
Across the 295 places in Thailand the best fixed tilt for solar panels runs from 4° in Narathiwat to 23° in Mae Chan, and flat ground gets 4.7 to 5.2 peak sun hours a day. Every number is computed for each place.
Solar power in Thailand at a glance
Averages over 295 places with climate data, for a fixed array facing south.
Best panel angle15°average, facing south
Peak sun hours5.08a day on flat ground
1 kWp makes1,509kWh a year at the best angle
Off-grid angle7°average, for the darkest month
- 4.74–4.84
- 4.84–4.94
- 4.94–5.03
- 5.03–5.13
- 5.13–5.23
Peak sun hours a day on flat ground. Each dot is one place.
The sunniest places in Thailand, with 5.23 peak sun hours a day on flat ground, are Bangkok and 7 other places; the least sunny is Mae Ramat with 4.74. A 1 kWp array at its best angle makes from 1,411 kWh a year in Ban Na San to 1,558 kWh in Bua Yai — 1,509 kWh on average.
The best year-round tilt runs from 4° in Narathiwat to 23° in Mae Chan. Off-grid systems are sized for the darkest month and do better steeper, at 7° on average: at 70° that month brings 1.22 kWh per kWp a day in Tak Bai and 1.77 kWh in Mae Sai.
Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.
Sunniest places in Thailand
Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 1 | Bangkok | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Phra Nakhon | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Bang Kho Laem | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Bang Phlat | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Rat Burana | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Khlong San | Bangkok | 5.23 | 1,543 | 15° |
| 1 | Thung Khru | Bangkok | 5.23 | 1,542 | 15° |
| 1 | Bang Khlo | Bangkok | 5.23 | 1,542 | 15° |
| 9 | Pak Kret | Nonthaburi | 5.22 | 1,543 | 15° |
| 9 | Bang Ban | Phra Nakhon Si Ayutthaya | 5.22 | 1,543 | 16° |
Least sunny places in Thailand
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 290 | Khao Saming | Trat | 4.78 | 1,416 | 15° |
| 292 | Nakhon Phanom | Nakhon Phanom | 4.77 | 1,455 | 20° |
| 292 | Trat | Trat | 4.77 | 1,415 | 15° |
| 294 | Mae Sot | Tak | 4.76 | 1,453 | 20° |
| 295 | Mae Ramat | Tak | 4.74 | 1,452 | 20° |
Solar by region in Thailand
Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.
| Region | Places | Sun hours/day | kWh per kWp a year | Best tilt | Darkest month at 70° | Sunniest place |
|---|---|---|---|---|---|---|
| Nonthaburi | 4 | 5.22 | 1,541 | 15° | 1.55 kWh | Pak Kret |
| Surin | 1 | 5.21 | 1,550 | 16° | 1.60 kWh | Surin |
| Bangkok | 58 | 5.21 | 1,538 | 15° | 1.54 kWh | Bangkok |
| Phra Nakhon Si Ayutthaya | 7 | 5.19 | 1,538 | 16° | 1.58 kWh | Bang Ban |
| Pathum Thani | 4 | 5.19 | 1,536 | 15° | 1.55 kWh | Pathum Thani |
| Phuket | 9 | 5.19 | 1,511 | 9° | 1.23 kWh | Ban Chalong |
| Si Sa Ket | 2 | 5.19 | 1,551 | 17° | 1.58 kWh | Si Sa Ket |
| Ang Thong | 1 | 5.19 | 1,538 | 16° | 1.60 kWh | Wiset Chaichan |
| Sing Buri | 2 | 5.19 | 1,540 | 16° | 1.61 kWh | Sing Buri |
| Samut Prakan | 4 | 5.18 | 1,530 | 15° | 1.52 kWh | Phra Pradaeng |
| Lopburi | 2 | 5.18 | 1,540 | 17° | 1.62 kWh | Lop Buri |
| Yasothon | 1 | 5.18 | 1,553 | 18° | 1.63 kWh | Yasothon |
| Buriram | 3 | 5.17 | 1,540 | 16° | 1.58 kWh | Buri Ram |
| Roi Et | 3 | 5.16 | 1,549 | 18° | 1.64 kWh | Kaset Wisai |
| Suphan Buri | 1 | 5.16 | 1,530 | 16° | 1.59 kWh | Suphan Buri |
| Saraburi | 5 | 5.15 | 1,529 | 16° | 1.59 kWh | Ban Mo |
| Chai Nat | 1 | 5.14 | 1,531 | 16° | 1.62 kWh | Chai Nat |
| Samut Sakhon | 3 | 5.14 | 1,520 | 15° | 1.52 kWh | Krathum Baen |
| Phichit | 4 | 5.14 | 1,534 | 18° | 1.67 kWh | Bang Mun Nak |
| Amnat Charoen | 1 | 5.14 | 1,545 | 18° | 1.62 kWh | Amnat Charoen |
| Nakhon Ratchasima | 9 | 5.13 | 1,533 | 16° | 1.60 kWh | Bua Yai |
| Nakhon Pathom | 3 | 5.13 | 1,519 | 15° | 1.54 kWh | Bang Len |
| Ubon Ratchathani | 4 | 5.13 | 1,537 | 18° | 1.57 kWh | Ubon Ratchathani |
| Maha Sarakham | 1 | 5.13 | 1,541 | 18° | 1.66 kWh | Maha Sarakham |
| Chon Buri | 10 | 5.10 | 1,508 | 15° | 1.47 kWh | Pattaya |
| Uthai Thani | 2 | 5.10 | 1,524 | 16° | 1.63 kWh | Uthai Thani |
| Nakhon Sawan | 2 | 5.09 | 1,523 | 17° | 1.64 kWh | Nakhon Sawan |
| Phitsanulok | 4 | 5.08 | 1,522 | 18° | 1.69 kWh | Bang Krathum |
| Kalasin | 5 | 5.07 | 1,532 | 19° | 1.65 kWh | Kamalasai |
| Chaiyaphum | 4 | 5.07 | 1,526 | 18° | 1.66 kWh | Chaiyaphum |
| Khon Kaen | 3 | 5.07 | 1,527 | 19° | 1.67 kWh | Ban Phai |
| Rayong | 4 | 5.07 | 1,498 | 14° | 1.40 kWh | Ban Chang |
| Chachoengsao | 3 | 5.06 | 1,500 | 15° | 1.51 kWh | Bang Pakong |
| Nakhon Nayok | 1 | 5.06 | 1,505 | 16° | 1.55 kWh | Nakhon Nayok |
| Samut Songkhram | 1 | 5.06 | 1,498 | 15° | 1.51 kWh | Samut Songkhram |
| Satun | 1 | 5.06 | 1,465 | 7° | 1.23 kWh | Satun |
| Phetchabun | 5 | 5.06 | 1,520 | 18° | 1.66 kWh | Wichian Buri |
| Pattani | 2 | 5.05 | 1,462 | 6° | 1.23 kWh | Yaring |
| Kamphaeng Phet | 2 | 5.04 | 1,510 | 17° | 1.66 kWh | Khanu Woralaksaburi |
| Sukhothai | 4 | 5.04 | 1,518 | 19° | 1.69 kWh | Sukhothai |
| Krabi | 1 | 5.03 | 1,466 | 9° | 1.26 kWh | Krabi |
| Sa Kaeo | 3 | 5.03 | 1,493 | 15° | 1.49 kWh | Aranyaprathet |
| Ratchaburi | 7 | 5.03 | 1,492 | 15° | 1.53 kWh | Bang Phae |
| Songkhla | 5 | 5.02 | 1,456 | 6° | 1.24 kWh | Songkhla |
| Kanchanaburi | 4 | 5.02 | 1,492 | 15° | 1.56 kWh | Bo Phloi |
| Prachin Buri | 9 | 5.01 | 1,491 | 16° | 1.53 kWh | Ban Sang |
| Sakon Nakhon | 3 | 5.01 | 1,523 | 20° | 1.65 kWh | Sawang Daen Din |
| Phatthalung | 1 | 5.01 | 1,453 | 7° | 1.25 kWh | Phatthalung |
| Mukdahan | 1 | 5.00 | 1,515 | 19° | 1.60 kWh | Mukdahan |
| Uttaradit | 1 | 5.00 | 1,513 | 20° | 1.70 kWh | Uttaradit |
| Phetchaburi | 4 | 4.99 | 1,480 | 14° | 1.48 kWh | Phetchaburi |
| Udon Thani | 6 | 4.99 | 1,516 | 20° | 1.68 kWh | Ban Nong Wua So |
| Nong Bua Lamphu | 2 | 4.99 | 1,511 | 20° | 1.69 kWh | Nong Bua Lamphu |
| Phang Nga | 1 | 4.99 | 1,457 | 10° | 1.26 kWh | Takua Pa |
| Narathiwat | 4 | 4.98 | 1,444 | 4° | 1.22 kWh | Tak Bai |
| Trang | 2 | 4.98 | 1,448 | 8° | 1.27 kWh | Trang |
| Yala | 2 | 4.96 | 1,440 | 5° | 1.25 kWh | Yala |
| Lampang | 2 | 4.96 | 1,507 | 20° | 1.69 kWh | Lampang |
| Phrae | 2 | 4.95 | 1,505 | 20° | 1.72 kWh | Den Chai |
| Nakhon Si Thammarat | 4 | 4.94 | 1,436 | 7° | 1.29 kWh | Pak Phanang |
| Loei | 4 | 4.92 | 1,494 | 20° | 1.68 kWh | Phu Kradueng |
| Prachuap Khiri Khan | 6 | 4.92 | 1,454 | 13° | 1.41 kWh | Hua Hin |
| Nong Khai | 3 | 4.90 | 1,493 | 20° | 1.66 kWh | Tha Bo |
| Surat Thani | 4 | 4.89 | 1,424 | 9° | 1.32 kWh | Ko Samui |
| Chanthaburi | 3 | 4.89 | 1,450 | 15° | 1.37 kWh | Tha Mai |
| Phayao | 2 | 4.88 | 1,504 | 21° | 1.74 kWh | Phayao |
| Chumphon | 2 | 4.87 | 1,423 | 11° | 1.30 kWh | Chumphon |
| Chiang Mai | 4 | 4.87 | 1,499 | 21° | 1.70 kWh | San Kamphaeng |
| Lamphun | 2 | 4.87 | 1,495 | 21° | 1.70 kWh | Lamphun |
| Tak | 4 | 4.83 | 1,470 | 20° | 1.55 kWh | Tak |
| Nan | 1 | 4.82 | 1,478 | 21° | 1.71 kWh | Nan |
| Ranong province | 1 | 4.82 | 1,411 | 11° | 1.28 kWh | Ranong |
| Chiang Rai | 3 | 4.81 | 1,499 | 23° | 1.76 kWh | Chiang Rai |
| Bueng Kan | 1 | 4.79 | 1,468 | 20° | 1.60 kWh | Seka |
| Trat | 4 | 4.79 | 1,419 | 15° | 1.32 kWh | Laem Ngop |
| Nakhon Phanom | 1 | 4.77 | 1,455 | 20° | 1.55 kWh | Nakhon Phanom |
Largest places in Thailand at a glance
| Place | Latitude | Best tilt | Off-grid tilt | Sun hours/day (flat) |
|---|---|---|---|---|
| Bangkok | 13.8° N | 15° | 10° | 5.23 |
| Samut Prakan | 13.6° N | 15° | 10° | 5.20 |
| Mueang Nonthaburi | 13.9° N | 15° | 10° | 5.22 |
| Chon Buri | 13.4° N | 15° | 8° | 5.10 |
| Phra Pradaeng | 13.7° N | 15° | 10° | 5.22 |
| Bang Khae | 13.7° N | 15° | 10° | 5.20 |
| Hat Yai | 7.0° N | 6° | 17° | 5.02 |
| Pak Kret | 13.9° N | 15° | 10° | 5.22 |
| Sai Mai | 13.9° N | 15° | 9° | 5.19 |
| Si Racha | 13.2° N | 15° | 8° | 5.12 |
| Watthana | 13.7° N | 15° | 10° | 5.21 |
| Khlong Sam Wa | 13.9° N | 15° | 9° | 5.17 |
| Bang Khun Thian | 13.7° N | 15° | 10° | 5.21 |
| Lat Krabang | 13.7° N | 15° | 9° | 5.16 |
| Chatuchak | 13.8° N | 15° | 10° | 5.21 |
| Ban Khlong Prawet | 13.7° N | 15° | 9° | 5.18 |
| Chom Thong | 13.7° N | 15° | 10° | 5.22 |
| Nong Chok | 13.9° N | 15° | 9° | 5.14 |
| Lampang | 18.3° N | 20° | 2° | 4.96 |
| Nong Khaem | 13.7° N | 15° | 10° | 5.18 |
Daylight and clock time in Thailand
In Mae Sai (20.4° N), the northernmost place, the longest day of the year lasts 13 h 22 min and the shortest 10 h 54 min; in Betong (5.8° N), the southernmost, 12 h 28 min and 11 h 47 min. Thailand does not use daylight saving time: the clocks stay the same all year.
| Time zone | Places | UTC offset | Clocks change in 2026 |
|---|---|---|---|
| Asia/Bangkok | 295 | UTC+7 | no daylight saving time |
Questions about solar in Thailand
What is the best angle for solar panels in Thailand?
Facing south, between 4° and 23° depending on the place — 15° on average over 295 places. Off-grid systems that must get through the darkest month do better steeper, at about 7° on average.
How many peak sun hours does Thailand get?
From 4.7 hours a day in Mae Ramat to 5.2 in Bangkok on flat ground, averaged over the year; 5.1 on average.
How much electricity does 1 kWp of solar panels produce in Thailand?
About 1,509 kWh a year at the best fixed angle on average, from 1,411 kWh in Ban Na San to 1,558 kWh in Bua Yai. These are long-term climate averages; a single year can be several per cent higher or lower.
Where is the sunniest place in Thailand?
Bangkok (Bangkok) and 7 other places share the most sun of the 295 places: 5.23 peak sun hours a day on flat ground. 1 kWp in Bangkok makes about 1,543 kWh a year.
Does Thailand use daylight saving time?
Thailand does not use daylight saving time: the clocks stay the same all year.
How long is the longest day in Thailand?
13 h 22 min in Mae Sai; the shortest day lasts 10 h 54 min in Mae Sai.
All places in Thailand
Amnat Charoen
Ang Thong
Bangkok
- Bangkok
- Bang Khae
- Sai Mai
- Watthana
- Khlong Sam Wa
- Bang Khun Thian
- Lat Krabang
- Chatuchak
- Ban Khlong Prawet
- Chom Thong
- Nong Chok
- Nong Khaem
- Bang Kapi
- Bueng Kum
- Din Daeng
- Bang Sue
- Ban Samae Dam
- Lat Phrao
- Phasi Charoen
- Thon Buri
- Bangkok Noi
- Thung Khru
- Suan Luang
- Wang Thonglang
- Lak Si
- Khlong Toei
- Dusit
- Taling Chan
- Bang Bon
- Bang Rak
- Bang Na
- Bang Phlat
- Phra Khanong
- Saphan Sung
- Khan Na Yao
- Rat Burana
- Sathon
- Yan Nawa
- Huai Khwang
- Thawi Watthana
- Khlong San
- Ratchathewi
- Bangkok Yai
- Phaya Thai
- Ban Tha Kham
- Pathum Wan
- Ban Lak Song
- Phra Nakhon
- Pom Prap Sattru Phai
- Khwaeng Bang Khae
- Bang Khlo
- Sam Sen Nai
- Samphanthawong
- Ban Khlong Bang Bon
- Bang Kho Laem
- Chatuchak subdistrict
- Ban Khlong Bang Ramat
- Ban Bang Bamru