Thị Trấn Thất Khê weather in September

In September, Thị Trấn Thất Khê sees average daytime highs of 30°C and overnight lows near 23°C, with 148 mm of rain across 16.3 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 23% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Thị Trấn Thất Khê's 4th-clearest and 11th-windiest month. For the whole year in context, see Thị Trấn Thất Khê's year-round climate.

Daytime high
30°
4th warmest
Overnight low
23°
9th coldest
Rainfall
148 mm
16.3 wet days
Daylight
12 h 06 min
5:45 AM – 5:52 PM
Cloud cover
67%
4th clearest
Wind
6 km/h
11th windiest
Solar energy
4.43 kWh/m²
Travel score
4.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Thị Trấn Thất Khê reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 33°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13124
23124
33124
43024
53024
63024
73023
83023
93023
103023
113023
123023
133023
143023
153023
163023
173023
183023
193022
203022
213022
223022
232922
242922
252922
262922
272922
282922
292922
302921

How September really feels in Thị Trấn Thất Khê

Once humidity and wind are folded in, September averages 23 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
23
heat index over the day's high
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.

Thị Trấn Thất Khê weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 11°398.210.85.4
Feb19° / 13°297.211.26.0
Mar22° / 16°591111.86.1
Apr26° / 20°901312.55.7
May29° / 23°21020.513.13.9
Jun31° / 24°27624.213.32.9
Jul31° / 25°27524.313.22.9
Aug31° / 24°26623.712.83.0
Sep30° / 23°14816.312.14.3
Oct27° / 20°719.411.56.4
Nov24° / 16°547.310.97.2
Dec19° / 12°376.710.76.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 61%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12872
22971
33070
43070
52971
62971
73169
83169
93268
103367
113367
123565
133565
143664
153961
163961
174060
184258
194357
204456
214555
224654
234753
244852
254951
264951
275050
285050
295050
305149

Chance of precipitation in September

Any precipitation

Thị Trấn Thất Khê gets around 148 mm of rain over 16.3 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 54% and peaks near 67% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
167
267
366
466
565
664
763
863
962
1061
1160
1259
1358
1456
1555
1654
1752
1851
1950
2049
2148
2247
2346
2445
2544
2643
2742
2841
2940
3040

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 52% of days. Sticky, muggy-or-worse air turns up on roughly 92% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10045739
20055738
30055837
40065836
51175635
61185733
71195732
811105731
912115729
1012125728
1113135627
1213145725
1314155624
1415165622
1515175621
1616185619
1717195518
1818215416
1928225315
2029235214
2129255113
22210265012
23210274812
24311294711
25311304610
2631231459
2741232448
2851332437
2951333426
3061433416

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over September. Sunrise moves from 5:40 AM to 5:49 AM, and sunset from 6:07 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:406:07
212.45:416:06
312.45:416:05
412.45:416:04
512.45:416:03
612.35:426:02
712.35:426:01
812.35:426:00
912.35:435:59
1012.35:435:58
1112.25:435:57
1212.25:435:56
1312.25:445:55
1412.25:445:54
1512.15:445:53
1612.15:455:52
1712.15:455:51
1812.15:455:50
1912.15:455:49
2012.05:465:48
2112.05:465:47
2212.05:465:46
2312.05:475:45
2412.05:475:44
2511.95:475:43
2611.95:485:42
2711.95:485:41
2811.95:485:40
2911.85:495:39
3011.85:495:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.43 kWh/m².

For context, solar energy here swings from a low near 2.13 kWh/m² to a high of 4.57 kWh/m² in July across the year — September's 4.43 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.5Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
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 Thị Trấn Thất Khê

In seasonPeak

In September, Thị Trấn Thất Khê sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Thị Trấn Thất Khê'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 September a good time to visit Thị Trấn Thất Khê?

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

4.3
Sightseeing
8th-best month of the year
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Thị Trấn Thất Khê for sightseeing.

What to pack for Thị Trấn Thất Khê in September

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

In September, Thị Trấn Thất Khê sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 16 days see rain.

light clothesrain gear

UV index in Thị Trấn Thất Khê in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Thị Trấn Thất Khê peaks around June 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highVery highExtremeVery highHighJun 23UV 12Nov 23UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Very high
Apr6High
May8Very high
Jun13Extreme
Jul12Extreme
Aug11Extreme
Sep9Very high
Oct8Very high
Nov6High
Dec6High

Air quality in Thị Trấn Thất Khê 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 Thị Trấn Thất Khê is worst in April — around 44 µg/m³ PM2.5 (poor), about 2.2× the cleanest month (July, 20 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorApr 944 µg/m³Jul 2020 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb41Poor
Mar44Poor
Apr44Poor
May30Moderate
Jun23Moderate
Jul20Moderate
Aug21Moderate
Sep24Moderate
Oct28Moderate
Nov33Moderate
Dec39Poor
Location & terrain

Where is Thị Trấn Thất Khê?

Thị Trấn Thất Khê sits at 22.3°N, 106.5°E, 159 m above sea level, in Vietnam. The nearest listed city is Cao Bằng, 51 km away.

Thái NguyênChũ

Topography around Thị Trấn Thất Khê

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thị Trấn Thất Khê.

Within 3 km, the terrain around Thị Trấn Thất Khê has significant variations in elevation — a maximum elevation change of 308 m around an average of 204 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 868 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,877 m.

The land around Thị Trấn Thất Khê is covered by trees (66%) and cropland (28%) within 3 km, trees (92%) within 16 km, and trees (89%) within 80 km.

3 km
308 m
16 km
868 m
80 km
1,877 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Cao Bằng 51 km · Lạng Sơn 54 km · Thị Trấn Nước Hai 63 km · Thị Trấn Trùng Khánh 65 km · Bắc Kạn 67 km · Thị Trấn Na Dương 79 km · Thái Nguyên 98 km · Chũ 98 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 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 Thị Trấn Thất Khê (22.2553°, 106.4736°, elevation 159 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).