★ January30° · ☂ 1 February 33° · ☂ 1 March 35° · ☂ 2 April 37° · ☂ 5 May 35° · ☂ 12 June 33° · ☂ 11 July 32° · ☂ 15 August 32° · ☂ 17 September 32° · ☂ 14 October 32° · ☂ 10 November 31° · ☂ 4 ★ December29° · ☂ 1 Chiang Mai in May:seriously hot, rain on many days Chiang Mai, Thailand · Records from 2006 to 2025. Not a forecast.
Mean high 35° Hottest day 42.1° (2016)
Mean low 24° Coldest night 18.8° (2006)
Rain days 12 days 3-24 by year
Rainfall 181mm Daylight 12.8 → 13.2 h
Chiang Mai's 12 months i Best: December and January
1 2 3 4 5 6 7 8 9 10 11 12
Trip types Sightseeing on foot Poorhot and muggy
Humidity 68% 30 muggy days
Clear days 5 days 15 overcast days
Mean wind 5 km/h Rarely windy
Sunrise / sunset (15th) 05:50 / 18:50 Daylight 12.8 → 13.2 h
Chiang Mai in May The rainy season starts and the smoke clears. Showers wash the air clean. Humidity jumps and afternoon rain is frequent, so bring an umbrella.
May brought serious heat to Chiang Mai, 35°C on a typical afternoon and 24°C overnight. Early mornings were the best time to be outside. Nights ran about 11°C colder than the afternoons, so a layer earned its place in the bag. About 12 days a month saw rain, enough that a wet-weather plan was worth having. Year to year it swung widely, from 3 rain days in 2020 to 24 in 2007.
Rain picked up sharply from May, up from 5 days the month before to 12. Highs topped 30°C on 28 days of the month on average. Mixing in indoor stops at midday made sense. The warmest year was 2010, with highs averaging 37.9°C, 3.2°C above normal. Rain days averaged 15 mm each, so when it rained it rained properly.
Typhoons i 1 of the last 20 years had a tropical storm pass within 300 km this month.
Nargis (2008), 135 km away tropical storm 1 2 3 4 1 5 6 7 8 9 10 11 12
Date by date i Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
May 1 Saturday 1 rain in 5 of 20 yrs 5/20 35° 23° May 1 rain on 25% of days 35° 23°
May 2 Sunday 2 rain in 7 of 20 yrs 7/20 35° 24° May 3 Monday 3 rain in 5 of 20 yrs 5/20 35° 24° May 4 Tuesday 4 rain in 4 of 20 yrs 4/20 35° 24° May 5 Wednesday 5 rain in 3 of 20 yrs 3/20 36° 24° May 6 Thursday 6 rain in 5 of 20 yrs 5/20 36° 24° May 7 Friday 7 rain in 3 of 20 yrs 3/20 36° 24° May 8 Saturday 8 rain in 3 of 20 yrs 3/20 36° 24° 2-8 rain on 21% of days 35° 24°
May 9 Sunday 9 rain in 2 of 20 yrs 2/20 36° 24° May 10 Monday 10 rain in 5 of 20 yrs 5/20 36° 25° May 11 Tuesday 11 rain in 8 of 20 yrs 8/20 35° 25° May 12 Wednesday 12 rain in 8 of 20 yrs 8/20 35° 24° May 13 Thursday 13 rain in 7 of 20 yrs 7/20 35° 24° May 14 Friday 14 rain in 8 of 20 yrs 8/20 35° 24° May 15 Saturday 15 rain in 8 of 20 yrs 8/20 34° 24° 9-15 rain on 33% of days 35° 24°
May 16 Sunday 16 rain in 8 of 20 yrs 8/20 35° 24° May 17 Monday 17 rain in 8 of 20 yrs 8/20 34° 24° May 18 Tuesday 18 rain in 10 of 20 yrs 10/20 34° 24° May 19 Wednesday 19 rain in 12 of 20 yrs 12/20 34° 24° May 20 Thursday 20 rain in 11 of 20 yrs 11/20 34° 24° May 21 Friday 21 rain in 8 of 20 yrs 8/20 34° 24° May 22 Saturday 22 rain in 8 of 20 yrs 8/20 34° 24° 16-22 rain on 46% of days 34° 24°
May 23 Sunday 23 rain in 5 of 20 yrs 5/20 35° 24° May 24 Monday 24 rain in 8 of 20 yrs 8/20 34° 24° May 25 Tuesday 25 rain in 10 of 20 yrs 10/20 34° 24° May 26 Wednesday 26 rain in 8 of 20 yrs 8/20 34° 24° May 27 Thursday 27 rain in 8 of 20 yrs 8/20 35° 25° May 28 Friday 28 rain in 13 of 20 yrs 13/20 34° 24° May 29 Saturday 29 rain in 15 of 20 yrs 15/20 33° 24° 23-29 rain on 48% of days 34° 24°
May 30 Sunday 30 rain in 14 of 20 yrs 14/20 33° 24° May 31 Monday 31 rain in 11 of 20 yrs 11/20 33° 24°
30-31 rain on 63% of days 33° 24°
May 1 rain on 25% of days 35° 23° 2-8 rain on 21% of days 35° 24° 9-15 rain on 33% of days 35° 24° 16-22 rain on 46% of days 34° 24° 23-29 rain on 48% of days 34° 24° 30-31 rain on 63% of days 33° 24°
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
May 1 Monday 1 rain in 5 of 20 yrs 5/20 35° 23° May 2 Tuesday 2 rain in 7 of 20 yrs 7/20 35° 24° May 3 Wednesday 3 rain in 5 of 20 yrs 5/20 35° 24° May 4 Thursday 4 rain in 4 of 20 yrs 4/20 35° 24° May 5 Friday 5 rain in 3 of 20 yrs 3/20 36° 24° May 6 Saturday 6 rain in 5 of 20 yrs 5/20 36° 24° 1-6 rain on 24% of days 35° 24°
May 7 Sunday 7 rain in 3 of 20 yrs 3/20 36° 24° May 8 Monday 8 rain in 3 of 20 yrs 3/20 36° 24° May 9 Tuesday 9 rain in 2 of 20 yrs 2/20 36° 24° May 10 Wednesday 10 rain in 5 of 20 yrs 5/20 36° 25° May 11 Thursday 11 rain in 8 of 20 yrs 8/20 35° 25° May 12 Friday 12 rain in 8 of 20 yrs 8/20 35° 24° May 13 Saturday 13 rain in 7 of 20 yrs 7/20 35° 24° 7-13 rain on 26% of days 36° 24°
May 14 Sunday 14 rain in 8 of 20 yrs 8/20 35° 24° May 15 Monday 15 rain in 8 of 20 yrs 8/20 34° 24° May 16 Tuesday 16 rain in 8 of 20 yrs 8/20 35° 24° May 17 Wednesday 17 rain in 8 of 20 yrs 8/20 34° 24° May 18 Thursday 18 rain in 10 of 20 yrs 10/20 34° 24° May 19 Friday 19 rain in 12 of 20 yrs 12/20 34° 24° May 20 Saturday 20 rain in 11 of 20 yrs 11/20 34° 24° 14-20 rain on 46% of days 34° 24°
May 21 Sunday 21 rain in 8 of 20 yrs 8/20 34° 24° May 22 Monday 22 rain in 8 of 20 yrs 8/20 34° 24° May 23 Tuesday 23 rain in 5 of 20 yrs 5/20 35° 24° May 24 Wednesday 24 rain in 8 of 20 yrs 8/20 34° 24° May 25 Thursday 25 rain in 10 of 20 yrs 10/20 34° 24° May 26 Friday 26 rain in 8 of 20 yrs 8/20 34° 24° May 27 Saturday 27 rain in 8 of 20 yrs 8/20 35° 25° 21-27 rain on 39% of days 34° 24°
May 28 Sunday 28 rain in 13 of 20 yrs 13/20 34° 24° May 29 Monday 29 rain in 15 of 20 yrs 15/20 33° 24° May 30 Tuesday 30 rain in 14 of 20 yrs 14/20 33° 24° May 31 Wednesday 31 rain in 11 of 20 yrs 11/20 33° 24°
28-31 rain on 66% of days 33° 24°
1-6 rain on 24% of days 35° 24° 7-13 rain on 26% of days 36° 24° 14-20 rain on 46% of days 34° 24° 21-27 rain on 39% of days 34° 24° 28-31 rain on 66% of days 33° 24°
Tap another date to change
2006 2mm
2007 6mm
2008 none
2009 42mm
2010 none
2011 5mm
2012 12mm
2013 none
2014 39mm
2015 none
2016 none
2017 12mm
2018 10mm
2019 10mm
2020 2mm
2021 8mm
2022 6mm
2023 7mm
2024 8mm
2025 15mm
Holidays in May (2027) May 1 to May 4 Labour Day and Coronation Day breakMay 3 Substitute for National Labour Day (1 May)May 20 Visakha Bucha DayMay 31 Memorial Day 1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)
Day by day temperature i 21° 29° 36° 44° 1 8 15 22 29 31
Your trip dates, the past 20 years Trip dates May 1 (Sat) 2 (Sun) 3 (Mon) 4 (Tue) 5 (Wed) 6 (Thu) 7 (Fri) 8 (Sat) 9 (Sun) 10 (Mon) 11 (Tue) 12 (Wed) 13 (Thu) 14 (Fri) 15 (Sat) 16 (Sun) 17 (Mon) 18 (Tue) 19 (Wed) 20 (Thu) 21 (Fri) 22 (Sat) 23 (Sun) 24 (Mon) 25 (Tue) 26 (Wed) 27 (Thu) 28 (Fri) 29 (Sat) 30 (Sun) 31 (Mon) ~ May 1 (Sat) 2 (Sun) 3 (Mon) 4 (Tue) 5 (Wed) 6 (Thu) 7 (Fri) 8 (Sat) 9 (Sun) 10 (Mon) 11 (Tue) 12 (Wed) 13 (Thu) 14 (Fri) 15 (Sat) 16 (Sun) 17 (Mon) 18 (Tue) 19 (Wed) 20 (Thu) 21 (Fri) 22 (Sat) 23 (Sun) 24 (Mon) 25 (Tue) 26 (Wed) 27 (Thu) 28 (Fri) 29 (Sat) 30 (Sun) 31 (Mon) 1-7 8-14 15-21 22-end Whole month
You can also click two dates on the axis. Hover a cell to see that day's rain. By year Driest trips first
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Trip rain days Month rain days Tap a date to start, tap another to end. Each cell is that date in one year. '06 '07 '08 '09 '10 '11 '12 '13 '14 '15 '16 '17 '18 '19 '20 '21 '22 '23 '24 '25
of 20 Dates outside your trip are dimmed.
One row per year, one cell per day. 2020 had 3 rain days, 2007 had 24.
Chiang Mai through the year What to pack At 35°C by day and 24°C at night, drink water often and bring a spare top. With an 11°C swing between day and night, dress in layers you can peel off at two in the afternoon and put back on at dusk.
A packable rain jacket weighs almost nothing and covers 12 rain days. Leave the suede at home.
Common questions Does it rain a lot in Chiang Mai in May? Over the past 20 years May averaged 12 rain days (1 mm or more) out of 31. Individual years ran from 3 in the driest to 24 in the wettest.
What should I wear in Chiang Mai in May? Days averaged 35°C and nights 24°C. Pack a compact umbrella, T-shirts, sunscreen plus a hat, and insect repellent.
Is May a good time to visit Chiang Mai? On warmth and rain days alone, Chiang Mai's easiest months were December and January. May ranked 12 of 12.
Is Chiang Mai humid in May? Mean relative humidity was 68%, with about 30 muggy days (dew point of 20°C or more) in the month.
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