Wewak weather in September

In September, Wewak sees average daytime highs of 27°C and overnight lows near 25°C, with 249 mm of rain across 24.2 wet days and about 12 hours of daylight. It is the 10th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 20% of the time in September, and the air most often feels oppressive.

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 Wewak's 2nd-clearest and 5th-windiest month. For the whole year in context, see Wewak's year-round climate.

Daytime high: 27°; 10th warmest
Overnight low: 25°; 3rd coldest
Rainfall: 249 mm; 24.2 wet days
Daylight: 12 hours; 6:20 AM – 6:19 PM
Cloud cover: 70%; 2nd clearest
Wind: 11 km/h; 5th windiest
Solar energy: 4.95 kWh/m²
Travel score: 4.2; out of 10

Wewak is provincial capital of East Sepik, Papua New Guinea.

Founded: 1919

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

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

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Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 27°C through the month.

A typical September day in Wewak reaches about 27°C in the afternoon and slips back to 25°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 28°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)	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	28	28	28	28	28	28	28	28	28	28	28	28
Avg low (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25

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

How September really feels in Wewak

Once humidity and wind are folded in, September averages 0 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Wewak weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 26°	143	22.1	12.2	4.3
Feb	28° / 26°	156	20.7	12.1	4.2
Mar	28° / 26°	184	24.1	12	4.1
Apr	28° / 26°	215	25.8	11.9	3.8
May	28° / 26°	265	27.9	11.8	3.7
Jun	28° / 25°	284	26.9	11.8	3.7
Jul	27° / 25°	300	26.4	11.8	4.0
Aug	27° / 25°	233	24.1	11.9	4.3
Sep	27° / 25°	249	24.2	12	4.2
Oct	28° / 25°	224	25.8	12.1	4.0
Nov	28° / 26°	214	25.9	12.2	3.8
Dec	28° / 26°	184	25.3	12.2	3.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 65%.

	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 (%)	38	37	37	36	36	35	35	34	34	34	33	33	34	33	33	33	33	34	35	35	35	34	35	35	35	34	35	36	35	36
Cloudier (%)	62	63	63	64	64	65	65	66	66	66	67	67	66	67	67	67	67	66	65	65	65	66	65	65	65	66	65	64	65	64

	Clearer (%)	Cloudier (%)
1	38	62
2	37	63
3	37	63
4	36	64
5	36	64
6	35	65
7	35	65
8	34	66
9	34	66
10	34	66
11	33	67
12	33	67
13	34	66
14	33	67
15	33	67
16	33	67
17	33	67
18	34	66
19	35	65
20	35	65
21	35	65
22	34	66
23	35	65
24	35	65
25	35	65
26	34	66
27	35	65
28	36	64
29	35	65
30	36	64

Chance of precipitation in September

Any precipitation

Wewak gets around 249 mm of rain over 24.2 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 80% and peaks near 81% 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 (%)	80	80	80	81	81	81	81	81	81	81	81	81	81	81	81	81	80	80	80	80	80	80	80	80	80	80	80	80	80	80

	Rain chance (%)
1	80
2	80
3	80
4	81
5	81
6	81
7	81
8	81
9	81
10	81
11	81
12	81
13	81
14	81
15	81
16	81
17	80
18	80
19	80
20	80
21	80
22	80
23	80
24	80
25	80
26	80
27	80
28	80
29	80
30	80

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 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Oppressive (%)	82	83	83	83	83	83	83	83	83	83	83	83	83	82	82	82	81	81	80	79	79	78	77	77	76	75	75	74	73	73
Miserable (%)	18	17	17	17	17	17	17	17	17	17	17	17	17	18	18	18	19	19	20	21	21	22	23	23	24	25	25	26	27	27

	Oppressive (%)	Miserable (%)
1	82	18
2	83	17
3	83	17
4	83	17
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	83	17
11	83	17
12	83	17
13	83	17
14	82	18
15	82	18
16	82	18
17	81	19
18	81	19
19	80	20
20	79	21
21	79	21
22	78	22
23	77	23
24	77	23
25	76	24
26	75	25
27	75	25
28	74	26
29	73	27
30	73	27

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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)	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12	11	11	11	11	11
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	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	12	calm
13	12	calm
14	12	calm
15	12	calm
16	12	calm
17	12	calm
18	12	calm
19	12	calm
20	12	calm
21	12	calm
22	12	calm
23	12	calm
24	12	calm
25	12	calm
26	11	calm
27	11	calm
28	11	calm
29	11	calm
30	11	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 6:27 AM to 6:14 AM, and sunset from 6:23 PM to 6:16 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	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	12.0	12.0
Sunrise (AM)	6:27	6:27	6:26	6:26	6:25	6:25	6:25	6:24	6:24	6:23	6:23	6:22	6:22	6:21	6:21	6:20	6:20	6:19	6:19	6:18	6:18	6:18	6:17	6:17	6:16	6:16	6:15	6:15	6:14	6:14
Sunset (PM)	6:23	6:23	6:23	6:22	6:22	6:22	6:22	6:21	6:21	6:21	6:21	6:20	6:20	6:20	6:19	6:19	6:19	6:19	6:18	6:18	6:18	6:18	6:17	6:17	6:17	6:17	6:16	6:16	6:16	6:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.9	6:27	6:23
2	11.9	6:27	6:23
3	11.9	6:26	6:23
4	11.9	6:26	6:22
5	11.9	6:25	6:22
6	11.9	6:25	6:22
7	12.0	6:25	6:22
8	12.0	6:24	6:21
9	12.0	6:24	6:21
10	12.0	6:23	6:21
11	12.0	6:23	6:21
12	12.0	6:22	6:20
13	12.0	6:22	6:20
14	12.0	6:21	6:20
15	12.0	6:21	6:19
16	12.0	6:20	6:19
17	12.0	6:20	6:19
18	12.0	6:19	6:19
19	12.0	6:19	6:18
20	12.0	6:18	6:18
21	12.0	6:18	6:18
22	12.0	6:18	6:18
23	12.0	6:17	6:17
24	12.0	6:17	6:17
25	12.0	6:16	6:17
26	12.0	6:16	6:17
27	12.0	6:15	6:16
28	12.0	6:15	6:16
29	12.0	6:14	6:16
30	12.0	6:14	6:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.95 kWh/m².

For context, solar energy here swings from a low near 4.07 kWh/m² to a high of 5.24 kWh/m² in October across the year — September's 4.95 kWh/m² sits near the top of that range.

	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)	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.9	4.9	4.9	4.9	4.9	5.0	5.0	5.0	5.0	5.0	5.1	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.2	5.2
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	4.8	Bright
2	4.8	Bright
3	4.8	Bright
4	4.8	Bright
5	4.8	Bright
6	4.8	Bright
7	4.8	Bright
8	4.8	Bright
9	4.8	Bright
10	4.8	Bright
11	4.9	Bright
12	4.9	Bright
13	4.9	Bright
14	4.9	Bright
15	4.9	Bright
16	5.0	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.1	Bright
22	5.1	Bright
23	5.1	Bright
24	5.1	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.2	Bright
29	5.2	Bright
30	5.2	Bright

Planning a trip in September

Is September a good time to visit Wewak?

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

4.2

Sightseeing

3rd-best month of the year

4.4

Beach & pool

4th-best month of the year

September is a reasonable time to visit Wewak for sightseeing.

What to pack for Wewak in September

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

In September, Wewak sees daytime highs around 27°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Wewak in September

The nearest coast averages about 29°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 19 km away) is warmest in May at about 30°C and coldest in August near 29°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	29	29	29	29	30	29	29	29	29	29	30	29
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	29	Tropical
Feb	29	Tropical
Mar	29	Tropical
Apr	29	Tropical
May	30	Tropical
Jun	29	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	29	Tropical
Oct	29	Tropical
Nov	30	Tropical
Dec	29	Tropical

UV index in Wewak in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wewak peaks around March 16 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 at about 11 (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)	15	15	16	15	12	11	11	12	14	14	14	13
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	15	Extreme
Mar	16	Extreme
Apr	15	Extreme
May	12	Extreme
Jun	11	Extreme
Jul	11	Extreme
Aug	12	Extreme
Sep	14	Extreme
Oct	14	Extreme
Nov	14	Extreme
Dec	13	Extreme

Air quality in Wewak 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 Wewak is worst in August — around 19 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (December, 7 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	9	8	8	9	10	11	15	19	18	15	8	7
Level	Good	Good	Good	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	8	Good
Mar	8	Good
Apr	9	Good
May	10	Good
Jun	11	Good
Jul	15	Moderate
Aug	19	Moderate
Sep	18	Moderate
Oct	15	Moderate
Nov	8	Good
Dec	7	Good

Location & terrain

Where is Wewak?

Wewak sits at 3.5°S, 143.6°E, 44 m above sea level, in Papua New Guinea. The nearest listed city is Mount Hagen, 265 km away.

Topography around Wewak

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

Within 3 km, the terrain around Wewak has only modest variations in elevation — a maximum elevation change of 51 m around an average of 2 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 549 m; within 80 km, large variations in elevation — a maximum elevation change of 1,191 m.

The land around Wewak is covered by water (77%) within 3 km, trees (51%) and water (46%) within 16 km, and water (48%) and trees (36%) within 80 km.

3 km

51 m

water 77%

16 km

549 m

trees 51%

80 km

1,191 m

water 48%

treesgrasslandartificial surfaceswatermangroves

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

September weather nearby: Mount Hagen 265 km · Mendi 289 km · Madang 303 km · Goroka 342 km · Jayapura 343 km · Abepura 350 km · Sentani 363 km · Lae 513 km

Papua New Guinea travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type I; 240 V · 50 Hz
Prices: ≈ 58% of US; price level, 2025
GDP per capita: $3,020; 2025
Homicide rate: 9.3; per 100k, 2010
Road deaths: 12.6; per 100k/yr, 2019
Income group: Lower middle; World Bank
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 Wewak (-3.5496°, 143.6323°, elevation 44 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. 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).

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

	Clearer (%)	Cloudier (%)
1	38	62
2	37	63
3	37	63
4	36	64
5	36	64
6	35	65
7	35	65
8	34	66
9	34	66
10	34	66
11	33	67
12	33	67
13	34	66
14	33	67
15	33	67
16	33	67
17	33	67
18	34	66
19	35	65
20	35	65
21	35	65
22	34	66
23	35	65
24	35	65
25	35	65
26	34	66
27	35	65
28	36	64
29	35	65
30	36	64

	Rain chance (%)
1	80
2	80
3	80
4	81
5	81
6	81
7	81
8	81
9	81
10	81
11	81
12	81
13	81
14	81
15	81
16	81
17	80
18	80
19	80
20	80
21	80
22	80
23	80
24	80
25	80
26	80
27	80
28	80
29	80
30	80

	Oppressive (%)	Miserable (%)
1	82	18
2	83	17
3	83	17
4	83	17
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	83	17
11	83	17
12	83	17
13	83	17
14	82	18
15	82	18
16	82	18
17	81	19
18	81	19
19	80	20
20	79	21
21	79	21
22	78	22
23	77	23
24	77	23
25	76	24
26	75	25
27	75	25
28	74	26
29	73	27
30	73	27

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

	Clearer (%)	Cloudier (%)
1	38	62
2	37	63
3	37	63
4	36	64
5	36	64
6	35	65
7	35	65
8	34	66
9	34	66
10	34	66
11	33	67
12	33	67
13	34	66
14	33	67
15	33	67
16	33	67
17	33	67
18	34	66
19	35	65
20	35	65
21	35	65
22	34	66
23	35	65
24	35	65
25	35	65
26	34	66
27	35	65
28	36	64
29	35	65
30	36	64

	Rain chance (%)
1	80
2	80
3	80
4	81
5	81
6	81
7	81
8	81
9	81
10	81
11	81
12	81
13	81
14	81
15	81
16	81
17	80
18	80
19	80
20	80
21	80
22	80
23	80
24	80
25	80
26	80
27	80
28	80
29	80
30	80

	Oppressive (%)	Miserable (%)
1	82	18
2	83	17
3	83	17
4	83	17
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	83	17
11	83	17
12	83	17
13	83	17
14	82	18
15	82	18
16	82	18
17	81	19
18	81	19
19	80	20
20	79	21
21	79	21
22	78	22
23	77	23
24	77	23
25	76	24
26	75	25
27	75	25
28	74	26
29	73	27
30	73	27

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

	Clearer (%)	Cloudier (%)
1	38	62
2	37	63
3	37	63
4	36	64
5	36	64
6	35	65
7	35	65
8	34	66
9	34	66
10	34	66
11	33	67
12	33	67
13	34	66
14	33	67
15	33	67
16	33	67
17	33	67
18	34	66
19	35	65
20	35	65
21	35	65
22	34	66
23	35	65
24	35	65
25	35	65
26	34	66
27	35	65
28	36	64
29	35	65
30	36	64

	Rain chance (%)
1	80
2	80
3	80
4	81
5	81
6	81
7	81
8	81
9	81
10	81
11	81
12	81
13	81
14	81
15	81
16	81
17	80
18	80
19	80
20	80
21	80
22	80
23	80
24	80
25	80
26	80
27	80
28	80
29	80
30	80

	Oppressive (%)	Miserable (%)
1	82	18
2	83	17
3	83	17
4	83	17
5	83	17
6	83	17
7	83	17
8	83	17
9	83	17
10	83	17
11	83	17
12	83	17
13	83	17
14	82	18
15	82	18
16	82	18
17	81	19
18	81	19
19	80	20
20	79	21
21	79	21
22	78	22
23	77	23
24	77	23
25	76	24
26	75	25
27	75	25
28	74	26
29	73	27
30	73	27