Tiom weather in September

In September, Tiom sees average daytime highs of 17°C and overnight lows near 8°C, with 276 mm of rain across 26.5 wet days and about 12 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 1% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Tiom's 4th-clearest and 9th-windiest month. For the whole year in context, see Tiom's year-round climate.

Daytime high: 17°; 9th warmest
Overnight low: 8°; 3rd coldest
Rainfall: 276 mm; 26.5 wet days
Daylight: 12 hours; 5:41 AM – 5:40 PM
Cloud cover: 88%; 4th clearest
Wind: 3 km/h; 9th windiest
Solar energy: 4.32 kWh/m²
Travel score: 3.1; out of 10

← August Tiom 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 17°C through the month.

A typical September day in Tiom reaches about 17°C in the afternoon and slips back to 8°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 19°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)	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8

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

Tiom weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	18° / 8°	422	29	12.2	3.1
Feb	18° / 8°	454	27.1	12.1	3.0
Mar	18° / 9°	473	30.2	12	3.0
Apr	18° / 9°	424	28.7	11.9	3.0
May	18° / 8°	303	26.9	11.8	3.3
Jun	17° / 8°	231	23.3	11.8	3.5
Jul	16° / 8°	220	24.1	11.8	3.3
Aug	17° / 8°	229	25.2	11.9	3.3
Sep	17° / 8°	276	26.5	12	3.1
Oct	18° / 8°	319	27.9	12.1	3.2
Nov	18° / 8°	339	28	12.2	3.1
Dec	18° / 9°	413	29.7	12.2	3.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 94%.

	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	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	4	4	4	4	3	3	3
Cloudier (%)	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94	96	96	96	96	97	97	97

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	4	96
25	4	96
26	4	96
27	4	96
28	3	97
29	3	97
30	3	97

Chance of precipitation in September

Any precipitation

Tiom gets around 276 mm of rain over 26.5 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 89% and peaks near 90% on the wettest days.

	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 (%)	85	85	86	87	87	88	88	88	89	89	89	89	89	89	90	90	90	90	89	89	89	89	89	89	89	89	89	90	90	90

	Rain chance (%)
1	85
2	85
3	86
4	87
5	87
6	88
7	88
8	88
9	89
10	89
11	89
12	89
13	89
14	89
15	90
16	90
17	90
18	90
19	89
20	89
21	89
22	89
23	89
24	89
25	89
26	89
27	89
28	90
29	90
30	90

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	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
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 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)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
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	3	calm
2	3	calm
3	3	calm
4	3	calm
5	3	calm
6	3	calm
7	3	calm
8	3	calm
9	3	calm
10	3	calm
11	3	calm
12	3	calm
13	3	calm
14	3	calm
15	3	calm
16	3	calm
17	3	calm
18	3	calm
19	3	calm
20	3	calm
21	3	calm
22	3	calm
23	3	calm
24	3	calm
25	3	calm
26	3	calm
27	3	calm
28	3	calm
29	3	calm
30	3	calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 6 minutes over September. Sunrise moves from 5:48 AM to 5:35 AM, and sunset from 5:44 PM to 5:36 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)	11.9	11.9	11.9	11.9	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	5:48	5:48	5:47	5:47	5:46	5:46	5:45	5:45	5:44	5:44	5:44	5:43	5:43	5:42	5:42	5:41	5:41	5:40	5:40	5:39	5:39	5:38	5:38	5:37	5:37	5:36	5:36	5:35	5:35	5:35
Sunset (PM)	5:44	5:43	5:43	5:43	5:43	5:42	5:42	5:42	5:42	5:41	5:41	5:41	5:41	5:40	5:40	5:40	5:40	5:39	5:39	5:39	5:39	5:38	5:38	5:38	5:38	5:37	5:37	5:37	5:37	5:36

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	5:48	5:44
2	11.9	5:48	5:43
3	11.9	5:47	5:43
4	11.9	5:47	5:43
5	11.9	5:46	5:43
6	11.9	5:46	5:42
7	11.9	5:45	5:42
8	11.9	5:45	5:42
9	12.0	5:44	5:42
10	12.0	5:44	5:41
11	12.0	5:44	5:41
12	12.0	5:43	5:41
13	12.0	5:43	5:41
14	12.0	5:42	5:40
15	12.0	5:42	5:40
16	12.0	5:41	5:40
17	12.0	5:41	5:40
18	12.0	5:40	5:39
19	12.0	5:40	5:39
20	12.0	5:39	5:39
21	12.0	5:39	5:39
22	12.0	5:38	5:38
23	12.0	5:38	5:38
24	12.0	5:37	5:38
25	12.0	5:37	5:38
26	12.0	5:36	5:37
27	12.0	5:36	5:37
28	12.0	5:35	5:37
29	12.0	5:35	5:37
30	12.0	5:35	5:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.32 kWh/m².

For context, solar energy here swings from a low near 3.78 kWh/m² to a high of 4.51 kWh/m² in October across the year — September's 4.32 kWh/m² falls in the middle.

	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	4.2	4.2	4.2	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	4.4	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	4.2	Bright
7	4.2	Bright
8	4.2	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	4.4	Bright
19	4.4	Bright
20	4.4	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

Is September a good time to visit Tiom?

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

3.1

Sightseeing

6th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Tiom.

What to pack for Tiom in September

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

In September, Tiom sees daytime highs around 17°C and nights near 8°C. Pack rain gear. Worth having: a warm layer. About 27 days see rain.

rain geara warm layer

UV index in Tiom in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 16 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tiom peaks around March 11 at about 19 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 13 (extreme).

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)	18	19	19	17	15	13	13	15	16	16	16	16
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	18	Extreme
Feb	19	Extreme
Mar	19	Extreme
Apr	17	Extreme
May	15	Extreme
Jun	13	Extreme
Jul	13	Extreme
Aug	15	Extreme
Sep	16	Extreme
Oct	16	Extreme
Nov	16	Extreme
Dec	16	Extreme

Location & terrain

Where is Tiom?

Tiom sits at 3.9°S, 138.5°E, 2,116 m above sea level, in Indonesia. The nearest listed city is Mulia, 57 km away.

Topography around Tiom

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

Within 3 km, the terrain around Tiom has large variations in elevation — a maximum elevation change of 666 m around an average of 2,189 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,009 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,632 m.

The land around Tiom is covered by trees (59%) and grassland (39%) within 3 km, trees (86%) within 16 km, and trees (92%) within 80 km.

3 km

666 m

trees 59%

16 km

2,009 m

trees 86%

80 km

4,632 m

trees 92%

treesgrasslandartificial surfaceswetland

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

September weather nearby: Mulia 57 km · Wamena 58 km · Agats 184 km · Timika 212 km · Sentani 274 km · Abepura 283 km · Jayapura 295 km · Nabire 334 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

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 Tiom (-3.9236°, 138.4547°, elevation 2,116 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. 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	17	8
2	17	8
3	17	8
4	17	8
5	17	8
6	17	8
7	17	8
8	17	8
9	17	8
10	17	8
11	17	8
12	17	8
13	17	8
14	17	8
15	17	8
16	17	8
17	17	8
18	17	8
19	17	8
20	17	8
21	17	8
22	17	8
23	17	8
24	17	8
25	17	8
26	17	8
27	17	8
28	17	8
29	17	8
30	17	8

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	4	96
25	4	96
26	4	96
27	4	96
28	3	97
29	3	97
30	3	97

	Rain chance (%)
1	85
2	85
3	86
4	87
5	87
6	88
7	88
8	88
9	89
10	89
11	89
12	89
13	89
14	89
15	90
16	90
17	90
18	90
19	89
20	89
21	89
22	89
23	89
24	89
25	89
26	89
27	89
28	90
29	90
30	90

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

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

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	4	96
25	4	96
26	4	96
27	4	96
28	3	97
29	3	97
30	3	97

	Rain chance (%)
1	85
2	85
3	86
4	87
5	87
6	88
7	88
8	88
9	89
10	89
11	89
12	89
13	89
14	89
15	90
16	90
17	90
18	90
19	89
20	89
21	89
22	89
23	89
24	89
25	89
26	89
27	89
28	90
29	90
30	90

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

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

	Clearer (%)	Cloudier (%)
1	6	94
2	6	94
3	6	94
4	6	94
5	6	94
6	6	94
7	6	94
8	6	94
9	6	94
10	6	94
11	6	94
12	6	94
13	6	94
14	6	94
15	6	94
16	6	94
17	6	94
18	6	94
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	4	96
25	4	96
26	4	96
27	4	96
28	3	97
29	3	97
30	3	97

	Rain chance (%)
1	85
2	85
3	86
4	87
5	87
6	88
7	88
8	88
9	89
10	89
11	89
12	89
13	89
14	89
15	90
16	90
17	90
18	90
19	89
20	89
21	89
22	89
23	89
24	89
25	89
26	89
27	89
28	90
29	90
30	90

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100