July is hot and sticky, with temperatures around 25–33°C (77–91°F) and humidity near 80%.
It’s the heart of the rainy season, but that doesn’t mean your trip will be ruined. Rainfall varies a lot by region—from around 100 mm in drier spots like Ayutthaya to over 500 mm in Trat.
Rain usually comes as short, heavy bursts, while a tropical storm may bring a few days of steady rain once or twice a month.
If you don’t mind a mix of sun, cloud, and showers, July has perks: lower prices, fewer crowds, and lush green scenery. Just don’t expect a run of guaranteed sunny days—whether you’re on the beach, in the city, or up north.
Average Temperatures and Rainfall in Thai Cities in July
| City | Low (°C / °F) | High (°C / °F) | Rainfall (mm) | Rainy Days |
|---|---|---|---|---|
| Bangkok | 26°C / 79°F | 33°C / 91°F | 105.1 | 14.6 |
| Pattaya | 27°C / 81°F | 31°C / 88°F | 138.8 | 16.7 |
| Hua Hin | 26°C / 79°F | 32°C / 90°F | 109.7 | 16.6 |
| Ayutthaya | 26°C / 79°F | 33°C / 91°F | 109.1 | 14.8 |
| Kanchanaburi | 26°C / 79°F | 33°C / 91°F | 121.5 | 15.1 |
| Trat | 26°C / 79°F | 30°C / 86°F | 564.0 | 23.8 |
| Chiang Mai | 24°C / 75°F | 31°C / 88°F | 120.4 | 14.9 |
| Chiang Rai | 24°C / 75°F | 30°C / 86°F | 191.4 | 18.8 |
| Sukhothai | 26°C / 79°F | 32°C / 90°F | 116.9 | 15.6 |
| Mae Hong Son | 24°C / 75°F | 31°C / 88°F | 157.4 | 17.9 |
| Pai | 23°C / 73°F | 29°C / 84°F | 154.4 | 17.8 |
| Krabi | 24°C / 75°F | 31°C / 88°F | 208.6 | 15.9 |
| Koh Phuket | 25°C / 77°F | 31°C / 88°F | 227.5 | 16.5 |
| Surat Thani | 24°C / 75°F | 32°C / 90°F | 195.1 | 17.6 |
| Koh Lanta | 25°C / 77°F | 31°C / 88°F | 209.4 | 14.9 |
| Phang Nga | 24°C / 75°F | 31°C / 88°F | 231.2 | 16.6 |
| Ban Khao Lak | 25°C / 77°F | 31°C / 88°F | 270.8 | 17.4 |
| Koh Samui | 27°C / 81°F | 32°C / 90°F | 128.1 | 15.7 |
| Koh Tao | 27°C / 81°F | 31°C / 88°F | 208.1 | 21.9 |
| Koh Pha-Ngan | 27°C / 81°F | 32°C / 90°F | 146.0 | 18.6 |
(Data source: Weather Spark. Averages vary by source and year, but these are solid planning baselines for the weather in Thailand in July.)
FAQs
Is July a good time to visit Thailand?
Yes—if you plan smart. Samui is sunny, Bangkok thrives rain or shine, and Chiang Mai is gorgeous in green.
Where isn’t it rainy in July?
Nowhere is totally dry, but the Gulf islands (Samui side) are far drier than Phuket.
What’s the rainiest month?
Usually, September, with August not far behind.
Is it expensive?
Not really—except Samui, which is in demand. Elsewhere, July is one of the best months for luxury deals.
Which is better: June, July, or August?
- Most reliable beach days → June
- Quieter, green landscapes, city and culture flexibility → June or July
- Lowest crowds and best deals (heavier rain okay) → August
Festivals in July?
The Ubon Ratchathani Candle Festival (July 17–23) features free parades of wax sculptures, and some temples offer blessing activities.
Suggested Itineraries for July
If you’re planning a trip in June, the best approach is to build around the Gulf islands—then add a mix of culture and city life depending on your interests. Here are three sample itineraries that work well this month:
7–10 Days · Island Focus
- Bangkok (2 nights): Food, temples, and a splash of nightlife.
- Koh Samui (5–7 nights): Relax on calm beaches, take day trips to Koh Phangan or Ang Thong Marine Park, and leave buffer days for both excursions and pure downtime.
10–12 Days · Culture + Nature
- Bangkok (3 nights): City highlights and markets.
- Kanchanaburi (1–2 nights): Bridge over the River Kwai, Death Railway, and Erawan Falls
- Chiang Mai (3 nights): Temples, cooking classes, elephant sanctuaries, and light trekking.
- Koh Samui (3 nights): Sun and sea to round off the trip.
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