Si Satchanalai weather in September

In September, Si Satchanalai sees average daytime highs of 32°C and overnight lows near 25°C, with 259 mm of rain across 23.9 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-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 6% 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 Si Satchanalai's 9th-clearest and 11th-windiest month. For the whole year in context, see Si Satchanalai's year-round climate.

Daytime high: 32°; 8th warmest
Overnight low: 25°; 7th coldest
Rainfall: 259 mm; 23.9 wet days
Daylight: 12 h 06 min; 6:12 AM – 6:18 PM
Cloud cover: 83%; 9th clearest
Wind: 4 km/h; 11th windiest
Solar energy: 4.34 kWh/m²
Travel score: 2.4; out of 10

Si Satchanalai is town in Sukhothai province, Thailand.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Si Satchanalai year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Si Satchanalai reaches about 32°C in the afternoon and slips back to 25°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.

	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
Avg high (°C)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32
Avg low (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

How September really feels in Si Satchanalai

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 feel dangerously hot (≥ 39°C)

Days feeling ≤ 0°C

wind chill below the day's low

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

Si Satchanalai weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 18°	15	2.1	11.1	5.4
Feb	34° / 20°	10	1.1	11.4	3.8
Mar	37° / 23°	26	3.5	11.9	2.1
Apr	38° / 26°	56	8.3	12.4	1.2
May	36° / 26°	211	19.6	12.8	1.7
Jun	34° / 26°	201	22.1	13	2.1
Jul	33° / 26°	215	23.3	12.9	2.3
Aug	32° / 26°	280	25.7	12.6	2.4
Sep	32° / 25°	259	23.9	12.1	2.4
Oct	32° / 24°	129	14.5	11.6	3.5
Nov	32° / 22°	27	4	11.2	4.8
Dec	31° / 19°	12	1.7	11	5.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 85%. Skies tend to open up as the month goes on.

	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
Clearer (%)	6	7	7	7	8	8	8	9	10	10	10	10	11	12	12	14	14	16	16	18	18	20	21	23	24	25	26	28	28	29
Cloudier (%)	94	93	93	93	92	92	92	91	90	90	90	90	89	88	88	86	86	84	84	82	82	80	79	77	76	75	74	72	72	71

	Clearer (%)	Cloudier (%)
1	6	94
2	7	93
3	7	93
4	7	93
5	8	92
6	8	92
7	8	92
8	9	91
9	10	90
10	10	90
11	10	90
12	10	90
13	11	89
14	12	88
15	12	88
16	14	86
17	14	86
18	16	84
19	16	84
20	18	82
21	18	82
22	20	80
23	21	79
24	23	77
25	24	76
26	25	75
27	26	74
28	28	72
29	28	72
30	29	71

Chance of precipitation in September

Any precipitation

Si Satchanalai gets around 259 mm of rain over 23.9 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 80% and peaks near 84% on the wettest days. The odds ease toward the end of the month.

	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
Rain chance (%)	84	84	84	84	84	84	84	84	84	83	83	83	83	82	82	81	81	80	79	79	78	77	77	76	75	74	74	73	72	71

	Rain chance (%)
1	84
2	84
3	84
4	84
5	84
6	84
7	84
8	84
9	84
10	83
11	83
12	83
13	83
14	82
15	82
16	81
17	81
18	80
19	79
20	79
21	78
22	77
23	77
24	76
25	75
26	74
27	74
28	73
29	72
30	71

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 97% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Oppressive (%)	3	3	3	3	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3	3	3	4	4	4	5	5	5
Miserable (%)	97	97	97	97	98	98	98	98	98	98	98	98	98	98	98	97	97	97	97	97	97	97	97	97	96	96	96	95	95	95

	Oppressive (%)	Miserable (%)
1	3	97
2	3	97
3	3	97
4	3	97
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	3	97
17	3	97
18	3	97
19	3	97
20	3	97
21	3	97
22	3	97
23	3	97
24	3	97
25	4	96
26	4	96
27	4	96
28	5	95
29	5	95
30	5	95

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

	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
Wind speed (km/h)	5	5	5	5	5	5	5	5	5	5	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

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 6:10 AM to 6:14 AM, and sunset from 6:31 PM to 6:06 PM.

	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
Daylight (h)	12.3	12.3	12.3	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.9	11.9
Sunrise (AM)	6:10	6:10	6:11	6:11	6:11	6:11	6:11	6:11	6:11	6:12	6:12	6:12	6:12	6:12	6:12	6:12	6:12	6:13	6:13	6:13	6:13	6:13	6:13	6:13	6:14	6:14	6:14	6:14	6:14	6:14
Sunset (PM)	6:31	6:30	6:29	6:29	6:28	6:27	6:26	6:25	6:24	6:23	6:23	6:22	6:21	6:20	6:19	6:18	6:17	6:16	6:16	6:15	6:14	6:13	6:12	6:11	6:10	6:09	6:09	6:08	6:07	6:06

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.3	6:10	6:31
2	12.3	6:10	6:30
3	12.3	6:11	6:29
4	12.3	6:11	6:29
5	12.3	6:11	6:28
6	12.3	6:11	6:27
7	12.2	6:11	6:26
8	12.2	6:11	6:25
9	12.2	6:11	6:24
10	12.2	6:12	6:23
11	12.2	6:12	6:23
12	12.2	6:12	6:22
13	12.1	6:12	6:21
14	12.1	6:12	6:20
15	12.1	6:12	6:19
16	12.1	6:12	6:18
17	12.1	6:12	6:17
18	12.1	6:13	6:16
19	12.0	6:13	6:16
20	12.0	6:13	6:15
21	12.0	6:13	6:14
22	12.0	6:13	6:13
23	12.0	6:13	6:12
24	12.0	6:13	6:11
25	11.9	6:14	6:10
26	11.9	6:14	6:09
27	11.9	6:14	6:09
28	11.9	6:14	6:08
29	11.9	6:14	6:07
30	11.9	6:14	6:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.34 kWh/m².

For context, solar energy here swings from a low near 3.99 kWh/m² to a high of 6.3 kWh/m² in April across the year — September's 4.34 kWh/m² sits near the bottom.

	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
Solar energy (kWh/m²)	4.2	4.2	4.2	4.2	4.2	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.4	4.4	4.4	4.4	4.4	4.5	4.5	4.5	4.5	4.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.2	Bright
2	4.2	Bright
3	4.2	Bright
4	4.2	Bright
5	4.2	Bright
6	4.3	Bright
7	4.3	Bright
8	4.3	Bright
9	4.3	Bright
10	4.3	Bright
11	4.3	Bright
12	4.3	Bright
13	4.3	Bright
14	4.3	Bright
15	4.3	Bright
16	4.3	Bright
17	4.3	Bright
18	4.3	Bright
19	4.3	Bright
20	4.3	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.4	Bright
25	4.4	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.5	Bright
30	4.5	Bright

Planning a trip in September

Hazard calendar for Si Satchanalai

In seasonPeak

In September, Si Satchanalai sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Si Satchanalai's monsoon runs May–October, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Si Satchanalai?

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

2.4

Sightseeing

6th-best month of the year

4.1

Beach & pool

8th-best month of the year

September is a weaker month for outdoor sightseeing in Si Satchanalai.

What to pack for Si Satchanalai in September

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

In September, Si Satchanalai sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

UV index in Si Satchanalai 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 Si Satchanalai peaks around June 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very 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)	8	10	9	11	12	13	13	13	12	10	8	7
Level	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high

	UV index (midday)	Level
Jan	8	Very high
Feb	10	Very high
Mar	9	Very high
Apr	11	Extreme
May	12	Extreme
Jun	13	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	12	Extreme
Oct	10	Very high
Nov	8	Very high
Dec	7	Very high

Air quality in Si Satchanalai 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 Si Satchanalai is worst in March — around 58 µg/m³ PM2.5 (unhealthy), about 2.8× the cleanest month (June, 21 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)	43	50	58	47	29	21	22	23	26	31	33	37
Level	Poor	Poor	Unhealthy	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	43	Poor
Feb	50	Poor
Mar	58	Unhealthy
Apr	47	Poor
May	29	Moderate
Jun	21	Moderate
Jul	22	Moderate
Aug	23	Moderate
Sep	26	Moderate
Oct	31	Moderate
Nov	33	Moderate
Dec	37	Poor

Location & terrain

Where is Si Satchanalai?

Si Satchanalai sits at 17.5°N, 99.8°E, 77 m above sea level, in Thailand. The nearest listed city is Sawankhalok, 24 km away.

Topography around Si Satchanalai

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

Within 3 km, the terrain around Si Satchanalai has only modest variations in elevation — a maximum elevation change of 158 m around an average of 83 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 352 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,381 m.

The land around Si Satchanalai is covered by cropland (47%) and trees (39%) within 3 km, trees (48%) and cropland (48%) within 16 km, and trees (62%) and cropland (35%) within 80 km.

3 km

158 m

cropland 47%

16 km

352 m

trees 48%

80 km

1,381 m

trees 62%

treesgrasslandcroplandartificial surfaceswater

← August Si Satchanalai year-round climate October →Best places to visit in September

September weather nearby: Sawankhalok 24 km · Uttaradit 37 km · Ban Na 56 km · Sukhothai 57 km · Thoen 59 km · Den Chai 60 km · Phrae 81 km · Ban Tak 89 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 Si Satchanalai (17.5169°, 99.7598°, elevation 77 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).

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	6	94
2	7	93
3	7	93
4	7	93
5	8	92
6	8	92
7	8	92
8	9	91
9	10	90
10	10	90
11	10	90
12	10	90
13	11	89
14	12	88
15	12	88
16	14	86
17	14	86
18	16	84
19	16	84
20	18	82
21	18	82
22	20	80
23	21	79
24	23	77
25	24	76
26	25	75
27	26	74
28	28	72
29	28	72
30	29	71

	Rain chance (%)
1	84
2	84
3	84
4	84
5	84
6	84
7	84
8	84
9	84
10	83
11	83
12	83
13	83
14	82
15	82
16	81
17	81
18	80
19	79
20	79
21	78
22	77
23	77
24	76
25	75
26	74
27	74
28	73
29	72
30	71

	Oppressive (%)	Miserable (%)
1	3	97
2	3	97
3	3	97
4	3	97
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	3	97
17	3	97
18	3	97
19	3	97
20	3	97
21	3	97
22	3	97
23	3	97
24	3	97
25	4	96
26	4	96
27	4	96
28	5	95
29	5	95
30	5	95

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	6	94
2	7	93
3	7	93
4	7	93
5	8	92
6	8	92
7	8	92
8	9	91
9	10	90
10	10	90
11	10	90
12	10	90
13	11	89
14	12	88
15	12	88
16	14	86
17	14	86
18	16	84
19	16	84
20	18	82
21	18	82
22	20	80
23	21	79
24	23	77
25	24	76
26	25	75
27	26	74
28	28	72
29	28	72
30	29	71

	Rain chance (%)
1	84
2	84
3	84
4	84
5	84
6	84
7	84
8	84
9	84
10	83
11	83
12	83
13	83
14	82
15	82
16	81
17	81
18	80
19	79
20	79
21	78
22	77
23	77
24	76
25	75
26	74
27	74
28	73
29	72
30	71

	Oppressive (%)	Miserable (%)
1	3	97
2	3	97
3	3	97
4	3	97
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	3	97
17	3	97
18	3	97
19	3	97
20	3	97
21	3	97
22	3	97
23	3	97
24	3	97
25	4	96
26	4	96
27	4	96
28	5	95
29	5	95
30	5	95

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	6	94
2	7	93
3	7	93
4	7	93
5	8	92
6	8	92
7	8	92
8	9	91
9	10	90
10	10	90
11	10	90
12	10	90
13	11	89
14	12	88
15	12	88
16	14	86
17	14	86
18	16	84
19	16	84
20	18	82
21	18	82
22	20	80
23	21	79
24	23	77
25	24	76
26	25	75
27	26	74
28	28	72
29	28	72
30	29	71

	Rain chance (%)
1	84
2	84
3	84
4	84
5	84
6	84
7	84
8	84
9	84
10	83
11	83
12	83
13	83
14	82
15	82
16	81
17	81
18	80
19	79
20	79
21	78
22	77
23	77
24	76
25	75
26	74
27	74
28	73
29	72
30	71

	Oppressive (%)	Miserable (%)
1	3	97
2	3	97
3	3	97
4	3	97
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	3	97
17	3	97
18	3	97
19	3	97
20	3	97
21	3	97
22	3	97
23	3	97
24	3	97
25	4	96
26	4	96
27	4	96
28	5	95
29	5	95
30	5	95