Gatak weather in September

In September, Gatak sees average daytime highs of 31°C and overnight lows near 22°C, with 40 mm of rain across 5.8 wet days and about 12 hours of daylight. It is the 2nd-warmest and 10th-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 26% of the time in September, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Gatak's 3rd-clearest and 1st-windiest month. For the whole year in context, see Gatak's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
22°
3rd coldest
Rainfall
40 mm
5.8 wet days
Daylight
12 hours
5:33 AM – 5:30 PM
Cloud cover
58%
3rd clearest
Wind
8 km/h
1st windiest
Solar energy
5.94 kWh/m²
Travel score
4.8
out of 10

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 Gatak reaches about 31°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13121
23121
33121
43121
53121
63121
73121
83121
93121
103121
113121
123121
133121
143121
153122
163122
173122
183122
193122
203122
213122
223122
233122
243122
253122
263122
273122
283122
293122
303122

How September really feels in Gatak

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.

Gatak weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°35427.912.42.9
Feb30° / 22°35327.212.22.7
Mar30° / 23°32028.112.12.8
Apr30° / 23°22325.411.83.0
May30° / 23°10716.611.74.1
Jun30° / 22°5910.311.64.8
Jul30° / 21°386.711.65.3
Aug30° / 21°193.811.85.5
Sep31° / 22°405.8124.8
Oct31° / 22°12114.712.23.8
Nov31° / 23°24224.312.32.9
Dec30° / 23°31326.712.42.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 27% of September, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25842
35842
45941
55941
65842
75842
85842
95842
105743
115743
125743
135644
145644
155446
165446
175347
185248
195248
205050
215050
224951
234852
244753
254753
264753
274654
284456
294357
304357

Chance of precipitation in September

Any precipitation

Gatak gets around 40 mm of rain over 5.8 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 20% and peaks near 31% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
115
215
315
415
515
615
715
815
915
1016
1116
1217
1317
1418
1518
1619
1720
1821
1922
2023
2123
2224
2325
2426
2527
2628
2729
2829
2930
3031

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 69% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11157014
21157014
31157014
41157014
51157014
61157014
71157014
81157014
91147114
101147114
110147214
120147115
130147016
140137116
150137017
160127018
170117019
180116920
190106921
20096922
21086923
22076924
23076825
24066826
25066727
26066628
27056629
28056530
29056431
30046432

Wind in September

Winds average 8 km/h in September, the windiest month of the year.

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

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 54 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over September. Sunrise moves from 5:41 AM to 5:25 AM, and sunset from 5:32 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.95:415:32
211.95:415:32
311.95:405:32
411.95:405:32
511.95:395:32
611.95:395:32
711.95:385:32
811.95:375:32
911.95:375:31
1011.95:365:31
1111.95:365:31
1211.95:355:31
1311.95:345:31
1411.95:345:31
1512.05:335:30
1612.05:335:30
1712.05:325:30
1812.05:325:30
1912.05:315:30
2012.05:305:30
2112.05:305:29
2212.05:295:29
2312.05:295:29
2412.05:285:29
2512.05:285:29
2612.05:275:29
2712.05:265:29
2812.05:265:29
2912.15:255:28
3012.15:255:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.94 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.56 kWh/m² to a high of 5.94 kWh/m² in September across the year — September's 5.94 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
136.0Bright
146.0Bright
156.0Bright
166.0Bright
176.0Bright
186.0Bright
196.0Bright
206.0Bright
216.0Bright
226.0Bright
236.0Bright
246.0Bright
256.0Bright
266.0Bright
276.0Bright
286.0Bright
296.0Bright
306.0Bright
Planning a trip in September

Hazard calendar for Gatak

In seasonPeak

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

Gatak sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Gatak's monsoon runs November–April, when most of the year's rain falls.

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

Is September a good time to visit Gatak?

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

4.8
Sightseeing
3rd-best month of the year
7.1
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Gatak for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Gatak in September

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

In September, Gatak sees daytime highs around 31°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

Sea temperature near Gatak in September

The nearest coast averages about 25°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 60 km away) is warmest in March at about 29°C and coldest in August near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug25Warm
Sep25Warm
Oct26Warm
Nov28Warm
Dec29Tropical

UV index in Gatak in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gatak peaks around March 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 14 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeVery highExtremeMar 13UV 14Jun 14UV 7
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar14Extreme
Apr12Extreme
May8Very high
Jun7Very high
Jul9Very high
Aug11Extreme
Sep13Extreme
Oct13Extreme
Nov9Very high
Dec11Extreme

Air quality in Gatak 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 Gatak is worst in May — around 54 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (September, 32 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorMay 1254 µg/m³Sep 1333 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb43Poor
Mar49Poor
Apr52Poor
May54Poor
Jun47Poor
Jul40Poor
Aug34Moderate
Sep32Moderate
Oct36Poor
Nov39Poor
Dec39Poor
Location & terrain

Where is Gatak?

Gatak sits at 7.6°S, 110.7°E, 144 m above sea level, in Indonesia. The nearest listed city is Delanggu, 4.0 km away.

Topography around Gatak

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

Within 3 km, the terrain around Gatak has only modest variations in elevation — a maximum elevation change of 55 m around an average of 141 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 481 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,291 m.

The land around Gatak is covered by cropland (44%), trees (30%) and artificial surfaces (23%) within 3 km, trees (34%), cropland (34%) and artificial surfaces (29%) within 16 km, and trees (62%) and cropland (21%) within 80 km.

3 km
55 m
16 km
481 m
80 km
3,291 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Delanggu 4.0 km · Ngemplak 5.0 km · Kartasura 6.0 km · Colomadu 8.0 km · Baki 9.0 km · Ceper 10 km · Karanganom 11 km · Grogol 13 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 Gatak (-7.5908°, 110.7044°, elevation 144 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).