Mae Sai weather in April

In April, Mae Sai sees average daytime highs of 34°C and overnight lows near 21°C, with 112 mm of rain across 10.7 wet days and about 12.5 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 34°C through the month. The sky is clear or mostly clear about 57% of the time in April, and the air most often feels muggy.

Daylight stretches from about 12 h 12 min at the start of April to 12 h 42 min by month's end. Set against the rest of the year, April is Mae Sai's 6th-clearest and 2nd-windiest month. For the whole year in context, see Mae Sai's year-round climate.

Daytime high
34°
1st warmest
Overnight low
21°
6th coldest
Rainfall
112 mm
10.7 wet days
Daylight
12 h 30 min
6:07 AM – 6:35 PM
Cloud cover
41%
6th clearest
Wind
4 km/h
2nd windiest
Solar energy
6.25 kWh/m²
Travel score
3.2
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 April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 34°C through the month.

A typical April day in Mae Sai reaches about 34°C in the afternoon and slips back to 21°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 38°C. Set against its neighbours, April runs on par with March and about 1°C warmer than May.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13319
23419
33420
43420
53420
63420
73420
83420
93420
103421
113421
123421
133421
143421
153421
163421
173421
183421
193421
203422
213422
223422
233422
243422
253422
263422
273322
283322
293322
303322

How April really feels in Mae Sai

Once humidity and wind are folded in, April averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Mae Sai weather by month

How April compares with the rest of the year at a glance. April is the 1st-warmest and 7th-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 April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 18% of April, with mostly cloudy or overcast conditions the remaining 25%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17921
27921
37921
47921
57921
67921
77822
87822
97723
107723
117723
127624
137624
147525
157525
167426
177426
187327
197327
207327
217327
227228
237228
247228
257228
267129
277129
287030
296931
306931

Chance of precipitation in April

Any precipitation

Mae Sai gets around 112 mm of rain over 10.7 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 36% and peaks near 52% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
126
226
326
426
527
627
728
828
929
1030
1131
1231
1332
1433
1534
1635
1736
1837
1939
2040
2141
2242
2343
2444
2546
2647
2748
2850
2951
3052

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the muggy band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
193149100
283051110
373050130
462951140
552851160
652750180
742650200
842450220
932350240
1032250260
1122049280
1221949300
1311749330
1411649350
1511448370
1601348390
1701148410
1801047430
190946450
200746470
210645490
220544510
230543520
240441550
250340570
260338590
270336610
280234640
290233641
300231661

Wind in April

Winds average 4 km/h in April.

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

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over April. Sunrise moves from 6:20 AM to 5:56 AM, and sunset from 6:30 PM to 6:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:206:30
212.26:196:31
312.26:186:31
412.26:176:31
512.36:166:32
612.36:156:32
712.36:146:32
812.36:146:32
912.36:136:33
1012.46:126:33
1112.46:116:33
1212.46:106:34
1312.46:096:34
1412.46:086:34
1512.46:086:34
1612.56:076:35
1712.56:066:35
1812.56:056:35
1912.56:046:36
2012.56:036:36
2112.66:036:36
2212.66:026:37
2312.66:016:37
2412.66:006:37
2512.66:006:38
2612.75:596:38
2712.75:586:38
2812.75:586:39
2912.75:576:39
3012.75:566:39

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.25 kWh/m² — the sunniest month for solar.

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 — April's 6.25 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.3Intense
36.3Intense
46.3Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.3Intense
186.3Intense
196.2Intense
206.2Intense
216.2Intense
226.2Intense
236.2Intense
246.1Intense
256.1Intense
266.1Intense
276.0Intense
286.0Intense
296.0Bright
306.0Bright
Planning a trip in April

Hazard calendar for Mae Sai

In seasonPeak

None of Mae Sai's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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 April a good time to visit Mae Sai?

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

3.2
Sightseeing
7th-best month of the year
6.2
Beach & pool
6th-best month of the year

April is a weaker month for outdoor sightseeing in Mae Sai. The water and warmth also suit a beach or pool day.

What to pack for Mae Sai in April

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

In April, Mae Sai sees daytime highs around 34°C and nights near 21°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

UV index in Mae Sai in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 10 (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 April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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
April 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).