Mae Sai weather in August

In August, Mae Sai sees average daytime highs of 31°C and overnight lows near 24°C, with 424 mm of rain across 28.7 wet days and about 12.7 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 2% of the time in August, and the air most often feels oppressive.

Daylight stretches from about 12 h 54 min at the start of August to 12 h 24 min by month's end. Set against the rest of the year, August is Mae Sai's 11th-clearest and 9th-windiest month. For the whole year in context, see Mae Sai's year-round climate.

Daytime high
31°
7th warmest
Overnight low
24°
10th coldest
Rainfall
424 mm
28.7 wet days
Daylight
12 h 42 min
6:03 AM – 6:46 PM
Cloud cover
90%
11th clearest
Wind
4 km/h
9th windiest
Solar energy
3.91 kWh/m²
Travel score
2.6
out of 10

Mae Sai is subdistrict municipality in Chiang Rai province, Thailand.

Density
5,365/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical August day in Mae Sai reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 33°C. Set against its neighbours, August runs on par with July and on par with September.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103024
113024
123024
133024
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124
313124

How August really feels in Mae Sai

Once humidity and wind are folded in, August averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Mae Sai weather by month

How August compares with the rest of the year at a glance. August is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 14°253.410.97.9
Feb30° / 14°152.411.36.1
Mar33° / 17°395.111.94.2
Apr34° / 21°11210.712.53.2
May33° / 23°27721.3132.8
Jun32° / 24°34926.713.22.4
Jul31° / 24°45528.513.12.5
Aug31° / 24°42428.712.72.6
Sep31° / 23°28724.212.13.0
Oct30° / 22°13416.711.54.3
Nov29° / 18°476.5116.5
Dec26° / 15°314.410.87.9

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 5% of August, with mostly cloudy or overcast conditions the remaining 92%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1595
2496
3496
4496
5595
6595
7595
8595
9595
10595
11595
12694
13793
14793
15793
16793
17793
18793
19793
20892
21991
22991
23991
241090
251090
261090
271090
281189
291189
301189
311189

Chance of precipitation in August

Any precipitation

Mae Sai gets around 424 mm of rain over 28.7 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 92% and peaks near 93% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
193
293
393
493
593
693
793
893
992
1092
1192
1292
1392
1492
1592
1692
1793
1893
1993
2092
2192
2292
2392
2492
2592
2692
2792
2891
2991
3091
3191

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the oppressive band about 65% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
16337
26238
36238
46238
56139
66139
76139
86139
96139
106139
116139
126238
136337
146436
156535
166535
176634
186733
196832
206931
217030
227030
237030
247030
257030
267030
277030
286931
296931
306832
316832

Wind in August

Winds average 4 km/h in August.

Across August, daily wind ranges from about 3 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 54 min at the start of August to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over August. Sunrise moves from 5:58 AM to 6:08 AM, and sunset from 6:55 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:586:55
212.95:596:54
312.95:596:54
412.95:596:53
512.96:006:53
612.96:006:52
712.96:016:52
812.86:016:51
912.86:016:50
1012.86:026:50
1112.86:026:49
1212.86:026:48
1312.86:036:48
1412.76:036:47
1512.76:036:46
1612.76:036:46
1712.76:046:45
1812.76:046:44
1912.76:046:43
2012.66:056:43
2112.66:056:42
2212.66:056:41
2312.66:066:40
2412.66:066:39
2512.56:066:39
2612.56:066:38
2712.56:076:37
2812.56:076:36
2912.56:076:35
3012.46:076:34
3112.46:086:33

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.91 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.91 kWh/m² to a high of 6.25 kWh/m² in April across the year — August's 3.91 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.9Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.9Moderate
204.0Moderate
214.0Moderate
224.0Bright
234.0Bright
244.0Bright
254.0Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
314.1Bright
Planning a trip in August

Hazard calendar for Mae Sai

In seasonPeak

In August, Mae Sai sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Mae Sai's monsoon runs May–September, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Mae Sai?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.6
Sightseeing
10th-best month of the year
3.7
Beach & pool
11th-best month of the year

August is a weaker month for outdoor sightseeing in Mae Sai.

What to pack for Mae Sai in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Mae Sai sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

UV index in Mae Sai in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mae Sai peaks around July 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 19UV 13Dec 20UV 7
UV index (midday)Level
Jan7High
Feb9Very high
Mar9Very high
Apr10Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Mae Sai in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Mae Sai is worst in April — around 156 µg/m³ PM2.5 (very unhealthy), about 12.0× the cleanest month (July, 13 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateApr 11150 µg/m³Jul 2313 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb40Poor
Mar128Unhealthy
Apr156Very unhealthy
May37Poor
Jun15Moderate
Jul13Moderate
Aug13Moderate
Sep13Moderate
Oct14Moderate
Nov15Moderate
Dec19Moderate
Location & terrain

Where is Mae Sai?

Mae Sai sits at 20.4°N, 99.9°E, 437 m above sea level, in Thailand. The nearest listed city is Tachilek, 2.0 km away.

Möng YawngPhayao

Topography around Mae Sai

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mae Sai.

Within 3 km, the terrain around Mae Sai has significant variations in elevation — a maximum elevation change of 398 m around an average of 464 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,235 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,977 m.

The land around Mae Sai is covered by trees (54%) and artificial surfaces (33%) within 3 km, trees (61%) and cropland (27%) within 16 km, and trees (81%) within 80 km.

3 km
398 m
16 km
1,235 m
80 km
1,977 m
treesgrasslandcroplandartificial surfaces
August weather nearby: Tachilek 2.0 km · Ban Khoan 24 km · Mae Chan 32 km · Chiang Rai 59 km · Ban Houakhoua 64 km · Möng Yawng 97 km · Kengtung 133 km · Phayao 138 km

Thailand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$8,057
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
4.8
per 100k, 2011
Road deaths
32.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 402
Religion
Buddhist 93%Muslim 5%Christian 1%other 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mae Sai (20.4335°, 99.8762°, elevation 437 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).