Mae Sai in Spring

In spring (March, April and May), Mae Sai sees average daytime highs around 33°C and overnight lows near 20°C, with 427 mm of rain over about 37 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.

Across spring, daytime highs hold fairly steady around 33°C. The sky is clear or mostly clear about 52% of the time across spring, and the air most often feels oppressive.

Spring is Mae Sai's 3rd-best season to visit on our travel score. For the whole year in context, see Mae Sai's year-round climate.

Avg daytime high: 33°C; warmest season of the year
Avg overnight low: 20°C
Rainfall: 427 mm; 37 wet days
Avg wind: 4 km/h
Travel score: 3.4; 3rd-best season
Months: Mar · Apr · May

← Winter Mae Sai year-round climate Summer →

Spring Summer Fall Winter

Temperature in Mae Sai in Spring

Average highAverage lowShaded bands: 10–90% of days

Across spring, daytime highs hold fairly steady around 33°C.

A typical spring day in Mae Sai reaches about 33°C and drops to 20°C overnight. The warmest of the three months is April, the coolest March.

How spring really feels in Mae Sai

Once humidity and wind are folded in, spring brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

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

Mae Sai weather by month

How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	27° / 14°	25	3.4	10.9	7.9
Feb	30° / 14°	15	2.4	11.3	6.1
Mar	33° / 17°	39	5.1	11.9	4.2
Apr	34° / 21°	112	10.7	12.5	3.2
May	33° / 23°	277	21.3	13	2.8
Jun	32° / 24°	349	26.7	13.2	2.4
Jul	31° / 24°	455	28.5	13.1	2.5
Aug	31° / 24°	424	28.7	12.7	2.6
Sep	31° / 23°	287	24.2	12.1	3.0
Oct	30° / 22°	134	16.7	11.5	4.3
Nov	29° / 18°	47	6.5	11	6.5
Dec	26° / 15°	31	4.4	10.8	7.9

Cloud cover in Spring

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time across spring.

Chance of precipitation in Spring

Any precipitation

Mae Sai gets around 427 mm of rain over 37 wet days across spring. The line is the day-by-day chance of measurable precipitation.

Humidity in Spring

DryComfortableHumidMuggyOppressiveMiserable

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

Wind in Spring

Winds average 4 km/h across spring.

Sunrise & sunset in Spring

DaylightNight

Daylight runs from about 11 h 36 min in early March to 13 h 06 min by late May. The lit band spans sunrise to sunset each day.

Solar energy in Spring

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across spring, about 5.9 kWh/m².

Planning a trip in spring

Hazard calendar for Mae Sai

In seasonPeak

In spring, Mae Sai overlaps 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 spring a good time to visit Mae Sai?

Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.

3.4

Sightseeing

3rd-best month of the year

6.1

Beach & pool

2nd-best month of the year

spring 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 Spring

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

In spring, Mae Sai sees daytime highs around 33°C and nights near 20°C. Pack light clothes, rain gear and sun protection. About 37 days see rain.

light clothesrain gearsun protection

UV index in Mae Sai in Spring

LowModerateHighVery highExtreme

Clear-sky midday UV across spring averages 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	7	9	9	10	11	13	13	13	11	10	8	7
Level	High	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	High

	UV index (midday)	Level
Jan	7	High
Feb	9	Very high
Mar	9	Very high
Apr	10	Very high
May	11	Extreme
Jun	13	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	11	Extreme
Oct	10	Extreme
Nov	8	Very high
Dec	7	High

Air quality in Mae Sai in Spring

GoodModeratePoorUnhealthyVery unhealthy

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	23	40	128	156	37	15	13	13	13	14	15	19
Level	Moderate	Poor	Unhealthy	Very unhealthy	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	40	Poor
Mar	128	Unhealthy
Apr	156	Very unhealthy
May	37	Poor
Jun	15	Moderate
Jul	13	Moderate
Aug	13	Moderate
Sep	13	Moderate
Oct	14	Moderate
Nov	15	Moderate
Dec	19	Moderate

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.

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

trees 54%

16 km

1,235 m

trees 61%

80 km

1,977 m

trees 81%

treesgrasslandcroplandartificial surfaces

← Winter Mae Sai year-round climate Summer →

Spring 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

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.