Phrae weather in September

In September, Phrae sees average daytime highs of 31°C and overnight lows near 24°C, with 312 mm of rain across 27.2 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Phrae's 9th-clearest and 11th-windiest month. For the whole year in context, see Phrae's year-round climate.

Daytime high
31°
7th warmest
Overnight low
24°
8th coldest
Rainfall
312 mm
27.2 wet days
Daylight
12 h 06 min
6:11 AM – 6:17 PM
Cloud cover
85%
9th clearest
Wind
4 km/h
11th windiest
Solar energy
4.22 kWh/m²
Travel score
2.6
out of 10

Phrae is town in Phrae province, Thailand.

Air quality
Moderate
PM10 45 µg/m³ · 2019

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical September day in Phrae reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°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)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Phrae

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
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.

Phrae weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 16°182.3116.4
Feb32° / 17°91.411.45.0
Mar35° / 21°324.411.93.3
Apr35° / 24°7110.412.42.4
May33° / 25°21521.712.82.4
Jun32° / 25°24625.613.12.4
Jul31° / 24°30028.5132.6
Aug30° / 24°36729.512.62.5
Sep31° / 24°31227.212.12.6
Oct31° / 23°12816.211.63.9
Nov31° / 20°273.911.15.6
Dec29° / 17°151.810.96.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 86%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1595
2595
3595
4694
5694
6694
7793
8793
9892
10991
11991
121090
131090
141189
151189
161387
171387
181486
191585
201684
211783
221981
232080
242179
252278
262377
272575
282674
292674
302872

Chance of precipitation in September

Any precipitation

Phrae gets around 312 mm of rain over 27.2 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 90% and peaks near 95% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
195
295
395
495
595
695
794
894
994
1094
1193
1293
1393
1492
1592
1691
1791
1890
1989
2089
2188
2287
2387
2486
2585
2684
2783
2882
2981
3080

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 71% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
102476
202575
302575
402575
502575
602575
702575
802674
902674
1002674
1102674
1202674
1302674
1402773
1502773
1602872
1702872
1802971
1902971
2002971
2103070
2203169
2303268
2403367
2503466
2603565
2713762
2813861
2913960
3014158

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.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 6:08 AM to 6:13 AM, and sunset from 6:30 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:086:30
212.36:086:29
312.36:096:28
412.36:096:27
512.36:096:27
612.36:096:26
712.36:096:25
812.26:096:24
912.26:106:23
1012.26:106:22
1112.26:106:21
1212.26:106:20
1312.26:106:19
1412.16:106:19
1512.16:116:18
1612.16:116:17
1712.16:116:16
1812.16:116:15
1912.06:116:14
2012.06:116:13
2112.06:126:12
2212.06:126:11
2312.06:126:11
2412.06:126:10
2511.96:126:09
2611.96:126:08
2711.96:136:07
2811.96:136:06
2911.96:136:05
3011.96:136:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.22 kWh/m².

For context, solar energy here swings from a low near 3.87 kWh/m² to a high of 6.31 kWh/m² in April across the year — September's 4.22 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Phrae

In seasonPeak

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

Phrae'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 Phrae?

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

2.6
Sightseeing
7th-best month of the year
3.9
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Phrae.

What to pack for Phrae in September

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

In September, Phrae sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 27 days see rain.

light clothesrain gear

UV index in Phrae in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Phrae peaks around June 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highJun 19UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar9Very high
Apr10Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Phrae 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 Phrae is worst in March — around 61 µg/m³ PM2.5 (unhealthy), about 3.4× the cleanest month (June, 18 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorPoorModerateMar 1859 µg/m³Jun 2318 µg/m³
PM2.5 (µg/m³)Level
Jan30Moderate
Feb42Poor
Mar61Unhealthy
Apr48Poor
May26Moderate
Jun18Moderate
Jul18Moderate
Aug18Moderate
Sep18Moderate
Oct19Moderate
Nov20Moderate
Dec22Moderate
Location & terrain

Where is Phrae?

Phrae sits at 18.1°N, 100.1°E, 162 m above sea level, in Thailand. The nearest listed city is Den Chai, 20 km away.

NanSawankhalokDok Kham TaiThoen

Topography around Phrae

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

Within 3 km, the terrain around Phrae has only modest variations in elevation — a maximum elevation change of 27 m around an average of 158 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 873 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,607 m.

The land around Phrae is covered by trees (38%), cropland (31%) and artificial surfaces (28%) within 3 km, trees (62%) and cropland (30%) within 16 km, and trees (81%) within 80 km.

3 km
27 m
16 km
873 m
80 km
1,607 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Den Chai 20 km · Uttaradit 58 km · Lampang 70 km · Si Satchanalai 81 km · Nan 98 km · Sawankhalok 98 km · Dok Kham Tai 114 km · Thoen 114 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 Phrae (18.1459°, 100.141°, elevation 162 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).