Pematangsiantar weather in July

In July, Pematangsiantar sees average daytime highs of 29°C and overnight lows near 21°C, with 237 mm of rain across 26.7 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 3% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of July to 12 h 06 min by month's end. Set against the rest of the year, July is Pematangsiantar's 2nd-clearest and 7th-windiest month. For the whole year in context, see Pematangsiantar's year-round climate.

Daytime high
29°
3rd warmest
Overnight low
21°
8th coldest
Rainfall
237 mm
26.7 wet days
Daylight
12 h 12 min
6:25 AM – 6:34 PM
Cloud cover
84%
2nd clearest
Wind
4 km/h
7th windiest
Solar energy
5.06 kWh/m²
Travel score
3.2
out of 10

Pematangsiantar is city in North Sumatra Province, Indonesia.

Density
3,491/km²
people per km²
Founded
1871

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical July day in Pematangsiantar reaches about 29°C in the afternoon and slips back to 21°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, July runs on par with June and on par with August.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12921
22921
32921
42921
52921
62921
72921
82921
92921
102921
112921
122921
132921
142921
152921
162921
172921
182921
192921
202921
212921
222921
232921
242921
252921
262921
272921
282921
292921
302921
312921

How July really feels in Pematangsiantar

Once humidity and wind are folded in, July averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Pematangsiantar weather by month

How July compares with the rest of the year at a glance. July is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 21°24027.911.83.5
Feb28° / 21°18924.111.93.4
Mar29° / 21°21726.5123.3
Apr29° / 22°24928.612.12.8
May30° / 22°26529.212.12.8
Jun30° / 22°23127.112.23.0
Jul29° / 21°23726.712.23.2
Aug29° / 21°27428.812.13.0
Sep29° / 21°36129.4122.9
Oct28° / 21°37530.211.92.9
Nov28° / 21°35129.411.93.2
Dec28° / 21°31529.611.83.3

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 8% of July, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21486
31387
41387
51387
61189
71189
81189
91189
101189
111189
121189
131189
141189
151189
161189
171090
181090
191090
201189
211189
221189
231189
241189
251189
261189
271189
281189
291189
301189
311090

Chance of precipitation in July

Any precipitation

Pematangsiantar gets around 237 mm of rain over 26.7 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 87% and peaks near 88% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
188
288
387
487
587
687
787
887
987
1086
1187
1287
1387
1487
1587
1687
1787
1887
1987
2086
2186
2286
2386
2487
2587
2687
2787
2887
2987
3088
3188

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

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

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)
1694
2793
3793
4892
5892
6892
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
211090
221090
231090
241090
251090
261189
271189
281189
291189
301189
311189

Wind in July

Winds average 4 km/h in July.

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

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 12 h 12 min at the start of July to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over July. Sunrise moves from 6:22 AM to 6:26 AM, and sunset from 6:32 PM to 6:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:226:32
212.26:226:32
312.26:226:32
412.26:236:33
512.26:236:33
612.26:236:33
712.26:236:33
812.26:236:33
912.26:246:33
1012.26:246:33
1112.26:246:34
1212.26:246:34
1312.26:246:34
1412.26:246:34
1512.26:256:34
1612.26:256:34
1712.26:256:34
1812.26:256:34
1912.26:256:34
2012.26:256:34
2112.16:256:34
2212.16:256:34
2312.16:256:34
2412.16:266:34
2512.16:266:34
2612.16:266:34
2712.16:266:34
2812.16:266:34
2912.16:266:34
3012.16:266:34
3112.16:266:34

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.06 kWh/m².

For context, solar energy here swings from a low near 3.99 kWh/m² to a high of 5.21 kWh/m² in March across the year — July's 5.06 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.1Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in July

Hazard calendar for Pematangsiantar

In seasonPeak

None of Pematangsiantar's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Pematangsiantar sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

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

Is July a good time to visit Pematangsiantar?

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

3.2
Sightseeing
5th-best month of the year
4.1
Beach & pool
3rd-best month of the year

July is a weaker month for outdoor sightseeing in Pematangsiantar.

What to pack for Pematangsiantar in July

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

In July, Pematangsiantar sees daytime highs around 29°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Pematangsiantar in July

The nearest coast averages about 30°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 57 km away) is warmest in June at about 30°C and coldest in January near 29°C.

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

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Pematangsiantar in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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 Pematangsiantar peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 21UV 15Jun 20UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun10Extreme
Jul11Extreme
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov11Extreme
Dec11Extreme

Air quality in Pematangsiantar in July

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Pematangsiantar is worst in October — around 40 µg/m³ PM2.5 (poor), and holds fairly steady the rest of the year.

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModeratePoorModerateOct 1039 µg/m³Dec 1729 µg/m³
PM2.5 (µg/m³)Level
Jan31Moderate
Feb35Moderate
Mar38Poor
Apr36Poor
May34Moderate
Jun33Moderate
Jul33Moderate
Aug34Moderate
Sep39Poor
Oct40Poor
Nov31Moderate
Dec29Moderate
Location & terrain

Where is Pematangsiantar?

Pematangsiantar sits at 3.0°N, 99.1°E, 388 m above sea level, in Indonesia. The nearest listed city is Pekan Bahapal, 21 km away.

Topography around Pematangsiantar

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

Within 3 km, the terrain around Pematangsiantar has only modest variations in elevation — a maximum elevation change of 130 m around an average of 382 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,193 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,429 m.

The land around Pematangsiantar is covered by artificial surfaces (56%) and trees (30%) within 3 km, trees (77%) within 16 km, and trees (70%) within 80 km.

3 km
130 m
16 km
1,193 m
80 km
2,429 m
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Pekan Bahapal 21 km · Tebingtinggi 42 km · Pangururan 57 km · Kisaran 61 km · Tongging 61 km · Paropo 62 km · Kabanjahe 66 km · Berastagi 67 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Pematangsiantar (2.9595°, 99.0687°, elevation 388 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).