Sai Mai weather in September

In September, Sai Mai sees average daytime highs of 32°C and overnight lows near 26°C, with 284 mm of rain across 26.9 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Sai Mai's 9th-clearest and 10th-windiest month. For the whole year in context, see Sai Mai's year-round climate.

Daytime high
32°
8th warmest
Overnight low
26°
7th coldest
Rainfall
284 mm
26.9 wet days
Daylight
12 h 06 min
6:09 AM – 6:14 PM
Cloud cover
86%
9th clearest
Wind
7 km/h
10th windiest
Solar energy
4.51 kWh/m²
Travel score
2.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Sai Mai reaches about 32°C in the afternoon and slips back to 26°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 34°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13326
23326
33326
43326
53326
63326
73326
83326
93326
103226
113226
123226
133226
143226
153226
163226
173226
183226
193226
203226
213226
223226
233226
243226
253226
263225
273225
283225
293225
303225

How September really feels in Sai Mai

Once humidity and wind are folded in, September 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
30 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Sai Mai weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 21°153.511.34.9
Feb33° / 23°163.711.54.1
Mar34° / 25°568.511.93.0
Apr35° / 27°9114.712.32.1
May34° / 27°18524.212.61.8
Jun34° / 27°17924.812.82.0
Jul33° / 26°18525.912.72.1
Aug33° / 26°20426.212.52.1
Sep32° / 26°28426.912.12.2
Oct32° / 25°16719.611.73.0
Nov32° / 24°335.811.44.3
Dec32° / 22°9211.25.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 7% of September, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6694
7694
8694
9694
10694
11694
12694
13694
14793
15793
16892
17991
18991
191090
201189
211288
221387
231387
241486
251486
261486
271486
281585
291684
301684

Chance of precipitation in September

Any precipitation

Sai Mai gets around 284 mm of rain over 26.9 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 90% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
189
289
390
490
590
690
790
890
991
1091
1191
1291
1391
1491
1591
1691
1791
1891
1990
2090
2190
2290
2389
2489
2589
2689
2789
2889
2989
3088

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1991
2991
3991
41090
51090
61090
71090
81189
91189
101189
111189
121189
131189
141189
151189
161090
171090
18991
19991
20892
21892
22793
23793
24793
25694
26694
27694
28694
29694
30793

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 6:09 AM to 6:10 AM, and sunset from 6:25 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:096:25
212.36:096:25
312.26:096:24
412.26:096:23
512.26:096:22
612.26:096:22
712.26:096:21
812.26:096:20
912.26:096:19
1012.26:096:19
1112.16:096:18
1212.16:096:17
1312.16:096:16
1412.16:096:16
1512.16:096:15
1612.16:096:14
1712.16:096:13
1812.06:096:12
1912.06:106:12
2012.06:106:11
2112.06:106:10
2212.06:106:09
2312.06:106:09
2412.06:106:08
2512.06:106:07
2611.96:106:06
2711.96:106:06
2811.96:106:05
2911.96:106:04
3011.96:106:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.51 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 6.09 kWh/m² in April across the year — September's 4.51 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Sai Mai

In seasonPeak

In September, Sai Mai sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

Sai Mai sits in the Pacific typhoon belt; the season peaks July–October.

Sai Mai's rainy season runs May–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Sai Mai?

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

2.2
Sightseeing
7th-best month of the year
3.6
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Sai Mai.

What to pack for Sai Mai in September

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

In September, Sai Mai sees daytime highs around 32°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Sai Mai in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 61 km away) is warmest in May at about 31°C and coldest in January near 27°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Sai Mai in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sai Mai peaks around August 14 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeExtremeVery highAug 14UV 13Dec 12UV 9
UV index (midday)Level
Jan9Very high
Feb9Very high
Mar12Extreme
Apr11Extreme
May10Very high
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct10Very high
Nov9Very high
Dec9Very high

Air quality in Sai Mai in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Sai Mai is worst in January — around 83 µg/m³ PM2.5 (unhealthy), about 1.9× the cleanest month (July, 43 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyJan 2382 µg/m³Jul 2443 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb81Unhealthy
Mar70Unhealthy
Apr64Unhealthy
May54Poor
Jun44Poor
Jul43Poor
Aug43Poor
Sep54Poor
Oct66Unhealthy
Nov67Unhealthy
Dec66Unhealthy
Location & terrain

Where is Sai Mai?

Sai Mai sits at 13.9°N, 100.6°E, 4 m above sea level, in Thailand. The nearest listed city is Anusawari, 4.0 km away.

Topography around Sai Mai

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

Within 3 km, the terrain around Sai Mai has only modest variations in elevation — a maximum elevation change of 18 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 56 m; within 80 km, large variations in elevation — a maximum elevation change of 1,011 m.

The land around Sai Mai is covered by artificial surfaces (65%) and trees (22%) within 3 km, artificial surfaces (52%) and trees (22%) within 16 km, and cropland (39%) and trees (20%) within 80 km.

3 km
18 m
16 km
56 m
80 km
1,011 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Anusawari 4.0 km · Tha Raeng 6.0 km · Lak Si 8.0 km · Chorakhe Bua 10 km · Khan Na Yao 11 km · Khlong Sam Wa 11 km · Sena Nikhom 12 km · Lat Yao 12 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 Sai Mai (13.9207°, 100.6455°, elevation 4 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).