Our synoptic decoder reads air temperature only, so this station reports no dew point, wind or pressure here.
Where Ko Samui stands
Not in the current ranking: this station has not reported a qualifying reading since 11:46 UTC.
Its highest placing today was 688th of 7,314, reached at 06:16 UTC.
☀️ How 28.6°C comparesA typical March afternoon in Majuro.Majuro, Marshall Islands, typically reaches 29.0°C in March, averaged over every March day its archive holds. Not a published climate normal: it is the mean of what we hold.
The last 24 hours
Local timeInsufficient recent observations to produce a 24-hour temperature chart.
46 Octobers on record
Average high · NOAA GHCN-DailyThe record book, month by month
Highest and lowest ever recorded here · with the day it happenedJan
36.5°
Sat 14 Jan 2006
18.6°
Thu 7 Jan 1999
Feb
38.9°
Tue 28 Feb 1995
17.8°
Mon 3 Feb 2014
Mar
39.9°
Fri 22 Mar 1996
20.4°
Wed 1 Mar 1989
Apr
38.0°
Mon 11 Apr 2016
21.7°
Wed 15 Apr 2015
May
37.2°
Record high
34.6°C
Fri 7 Oct 2016
Record low
22.5°C
Wed 7 Oct 2015
Average high
29.7°C
all years on record
- 1
Between its coldest night and its hottest day, this place has swung 22.1°C.
From our dataRecord high 39.9°C against record low 17.8°C. - 2
At 07:00 it was 27.3°C. By 13:00 it was 28.6°C. The night never stood a chance.
From our dataToday so far at this station, in local time.
New facts every day. Report an error.
6.0°C short of the record for 7 October
Today’s high 28.6°C against 34.6°C in 2016. A reading that beats it is flagged here automatically, once a second cycle confirms it.
All-time record high
39.9°C
- Date
- Friday, 22 March 1996
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- Ko Samui, Thailand
- Position
- 9.47°N 100.05°E · 5 m
The highest in available records since 1969. Source: GHCN-Daily, 1969 to 2025.
All-time record low
17.8°C
- Date
- Monday, 3 February 2014
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- Ko Samui, Thailand
- Position
- 9.47°N 100.05°E · 5 m
The lowest in available records since 1969. Source: GHCN-Daily, 1969 to 2025.
By year, from our own record
2026
Highest 28.6°C, lowest 27.3°C. 6 days recorded from 7 readings.
By month, from our own record
For the long record, see Ko Samui’s average and record temperature for every month.
| Month | High | Low | Mean | Days | Readings |
|---|---|---|---|---|---|
| October 2026 | 28.6°C | 27.3°C | - | 2 | 3 |
| September 2026 | 28.3°C | 27.7°C | - | 4 | 4 |
Highest and lowest we have recorded here
Highest
28.6°C
Wed 7 Oct 2026 at 13:00 local
Lowest
27.3°C
Wed 7 Oct 2026 at 07:00 local
These are not official records. They are the highest and lowest readings this site has stored for Ko Samui since September 2026, across 6 days we hold a reading for. Official climatological records are adjudicated by national meteorological services and by the WMO.
Ko Samui (WMO 48550) is a SYNOP weather station in Thailand, 5 m above sea level, about 15 km from Ko Samui.
We have kept a daily record here for 6 of the 13 days since 25 September 2026, from 7 observations.
Recent temperature history
The same record at three widths, picking up where the last 24 hours above leaves off. Each period is summarised from the grain that suits it, so nothing here is one reading repeated thousands of times into the page.
Recent readings
Each reading as it arrived, newest first, with what our quality checks did with it. A reading we did not count is shown struck through with the reason.
| Time | Temp | Change | Status |
|---|---|---|---|
| high | 28.6°C | +1.3°C | Counted once, re-offered 12 times |
| low | 27.3°C | Counted |
Times are local time. 2 readings counted and 1 republished by the feed after we had already stored it.
In summary
Over the last week we have readings for 2 days here, running from 27.3°C to 28.6°C, a spread of 1.3°C.
Its best placing today was 688th hottest of the 7,314 stations reporting.
Recent days
Typically 1 reading a day.
| Day | High | At | Low | At |
|---|---|---|---|---|
| 2026-10-07 | 28.6°C | 06:00 UTC | 27.3°C | 00:00 UTC |
| 2026-10-03 | 28.5°C | 18:00 UTC | 28.5°C | 18:00 UTC |
| 2026-09-30 | 28.3°C | 12:00 UTC | 28.3°C | 12:00 UTC |
| 2026-09-27 | 28.3°C | 00:00 UTC | 28.3°C |
Nearby, and the opposite
- Nearest stationSamui Intl32.0°C9.1 km away, today's high
- Warmest nearbySurat Thani Intl34.0°C105.3 km away
- Coldest nearbySurat Thani24.5°C86.1 km away, today's low
- The opposite of hereDavis Lgb 46 Aws−66.5°CAntarctica
What we have stored, day by day
We have readings for 6 of the 13 days since we started storing this station on 25 September 2026.
Tracking history
It is on a run of 1 day now. Its longest unbroken run is 3 days.
- First reading stored27.7°C on our first day here
Where this station is
This station lies about 1,100 km north of the equator. It lies within the tropics.
Where Ko Samui is
z6
9.47°N 100.05°E
Ko Samui
Ground · satellite
Land surface temperature for 2026-10-06, from NASA GIBS. This is the temperature of the ground seen from orbit, not the air, and it is never ranked against air readings. Cloud hides the ground, so gaps are unread rather than guessed.
View more on Google Maps9.4667°N, 100.0500°E
Ko Samui, answered from the data
How hot does it get in Ko Samui?
The warmest month on record here is March, when the highest reading has reached 39.9°C (103.8°F) on Friday, 22 March 1996.
NOAA GHCN-Daily, highest reading recorded in each month
How cold does it get in Ko Samui?
The coldest month on record here is February, when the lowest reading has fallen to 17.8°C (64.0°F) on Monday, 3 February 2014.
NOAA GHCN-Daily, lowest reading recorded in each month
What is the highest temperature ever recorded in Ko Samui?
39.9°C (103.8°F) on Friday, 22 March 1996. That is the highest in the daily record we hold for this station, which runs since 1969. It is not an officially certified record unless a meteorological authority has recognised it.
NOAA GHCN-Daily
What is the lowest temperature ever recorded in Ko Samui?
17.8°C (64.0°F) on Monday, 3 February 2014. That is the lowest in the daily record we hold, which runs since 1969.
NOAA GHCN-Daily
What is the temperature in Ko Samui right now?
28.6°C (83.5°F), measured at 13:00 local on Wednesday 7 October.
Live reading from the station, after our quality checks
Is Ko Samui the hottest place on Earth?
Data sources for this page
Readings here arrive through NOAA WMO SYNOP bulletins. SYNOP is the surface synoptic report that national weather services file to the WMO, typically at the main hours of 00, 06, 12 and 18 UTC and often three hourly between them. It covers places with no airport, which is why the coldest readings on Earth arrive this way.
| Figure | Source | Type |
|---|---|---|
| Latest reading, today so far | NOAA Aviation Weather Center (METAR) and NOAA NWS WMO bulletins (SYNOP) | Measured, station |
| All-time, monthly and on-this-day records | NOAA NCEI Global Historical Climatology Network daily (GHCN-Daily), 1969 to 2025 at this site and its predecessors, and our own observations, 6 days | Measured, station |
| Nearby stations and distances | Computed from station positions in our own database | Calculated |
How these readings are checked
Every reading on this page has passed the checks below. A reading that fails any of them is stored as refused and can never be ranked, shown as a record, or counted in a daily high or low.
52 readings from this station have been refused in the 12 days since readings began being logged against individual stations.
- The reading is recent enough for its network: 52
- 01
Has a real position
A reading with no usable latitude and longitude is discarded. It cannot be ranked, mapped, or compared with its neighbours, and a temperature with no place is not an answer to which place is hottest.
- 02
Position is not a placeholder
Some feeds fill an unknown position with a stand-in value such as 99.99 degrees or an elevation of 9999 m. Those are not coordinates. They are caught separately from a missing position because a station placed at a fake point has no neighbours, so the neighbour check below can never see anything wrong with it.
- 03
The bulletin itself is current
SYNOP arrives as files that are only re-read when they change. A file that has stopped being updated is set aside whole, before any reading inside it is considered.
- 04
The reading is recent enough for its network
Different networks get different windows, because they report at different rates: 2 hours for METAR, which transmits continuously, and 9 hours for SYNOP, which reports at 00, 06, 12 and 18 UTC. A single rule would have discarded the entire synoptic network, including every station in Antarctica.