Bitung weather in September

In September, Bitung sees average daytime highs of 29°C and overnight lows near 25°C, with 66 mm of rain across 11.2 wet days and about 12 hours of daylight. It is the 5th-warmest and 12th-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 24% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Bitung's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Bitung's year-round climate.

Daytime high: 29°; 5th warmest
Overnight low: 25°; 2nd coldest
Rainfall: 66 mm; 11.2 wet days
Daylight: 12 hours; 5:34 AM – 5:34 PM
Cloud cover: 63%; 2nd clearest
Wind: 12 km/h; 3rd windiest
Solar energy: 6.37 kWh/m²
Travel score: 5.3; out of 10

← August Bitung 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 29°C through the month.

A typical September day in Bitung reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 30°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)	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29
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	29	25
2	29	25
3	29	25
4	29	25
5	29	25
6	29	25
7	29	25
8	29	25
9	29	25
10	29	25
11	29	25
12	29	25
13	29	25
14	29	25
15	29	25
16	29	25
17	29	25
18	29	25
19	29	25
20	29	25
21	29	25
22	29	25
23	29	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

How September really feels in Bitung

Once humidity and wind are folded in, September averages 28 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

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

Bitung weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 12th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 25°	178	25	11.9	3.7
Feb	28° / 25°	165	21.2	12	3.9
Mar	29° / 25°	155	22.9	12	3.9
Apr	29° / 26°	188	23.6	12	3.6
May	29° / 26°	222	25.4	12.1	3.6
Jun	29° / 25°	220	22.7	12.1	3.9
Jul	28° / 25°	146	18	12.1	4.8
Aug	28° / 25°	74	10.1	12	5.7
Sep	29° / 25°	66	11.2	12	5.3
Oct	29° / 25°	126	17.3	12	4.4
Nov	29° / 26°	164	24.7	11.9	3.4
Dec	29° / 26°	172	25.8	11.9	3.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 57%.

	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 (%)	47	47	45	44	44	44	43	42	43	43	41	41	42	41	42	42	43	43	44	44	45	45	45	45	45	43	43	42	42	41
Cloudier (%)	53	53	55	56	56	56	57	58	57	57	59	59	58	59	58	58	57	57	56	56	55	55	55	55	55	57	57	58	58	59

	Clearer (%)	Cloudier (%)
1	47	53
2	47	53
3	45	55
4	44	56
5	44	56
6	44	56
7	43	57
8	42	58
9	43	57
10	43	57
11	41	59
12	41	59
13	42	58
14	41	59
15	42	58
16	42	58
17	43	57
18	43	57
19	44	56
20	44	56
21	45	55
22	45	55
23	45	55
24	45	55
25	45	55
26	43	57
27	43	57
28	42	58
29	42	58
30	41	59

Chance of precipitation in September

Any precipitation

Bitung gets around 66 mm of rain over 11.2 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 41% 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 (%)	35	35	36	36	36	36	37	37	37	38	38	38	39	39	39	39	39	39	39	39	38	38	38	39	39	39	39	40	40	41

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	36
7	37
8	37
9	37
10	38
11	38
12	38
13	39
14	39
15	39
16	39
17	39
18	39
19	39
20	39
21	38
22	38
23	38
24	39
25	39
26	39
27	39
28	40
29	40
30	41

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 84% 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
Muggy (%)	4	4	4	5	5	5	6	6	6	6	6	6	6	6	6	6	6	5	5	5	4	4	4	3	3	3	3	2	2	2
Oppressive (%)	90	89	89	88	88	87	86	85	85	84	84	83	83	82	82	81	81	82	81	81	82	82	81	82	82	82	81	82	82	81
Miserable (%)	6	7	7	7	7	8	8	9	9	10	10	11	11	12	12	13	13	13	14	14	14	14	15	15	15	15	16	16	16	17

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	90	6
2	4	89	7
3	4	89	7
4	5	88	7
5	5	88	7
6	5	87	8
7	6	86	8
8	6	85	9
9	6	85	9
10	6	84	10
11	6	84	10
12	6	83	11
13	6	83	11
14	6	82	12
15	6	82	12
16	6	81	13
17	6	81	13
18	5	82	13
19	5	81	14
20	5	81	14
21	4	82	14
22	4	82	14
23	4	81	15
24	3	82	15
25	3	82	15
26	3	82	15
27	3	81	16
28	2	82	16
29	2	82	16
30	2	81	17

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 13 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)	13	13	13	13	13	13	13	13	13	13	13	13	13	12	12	12	12	12	12	12	12	11	11	11	11	11	11	11	10	10
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	13	light breeze
2	13	light breeze
3	13	light breeze
4	13	light breeze
5	13	light breeze
6	13	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	12	light breeze
15	12	light breeze
16	12	light breeze
17	12	light breeze
18	12	calm
19	12	calm
20	12	calm
21	12	calm
22	11	calm
23	11	calm
24	11	calm
25	11	calm
26	11	calm
27	11	calm
28	11	calm
29	10	calm
30	10	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 hours 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 0 minutes over September. Sunrise moves from 5:38 AM to 5:29 AM, and sunset from 5:40 PM to 5:28 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)	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	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	5:38	5:38	5:38	5:37	5:37	5:37	5:37	5:36	5:36	5:36	5:35	5:35	5:35	5:34	5:34	5:34	5:33	5:33	5:33	5:32	5:32	5:32	5:31	5:31	5:31	5:30	5:30	5:30	5:29	5:29
Sunset (PM)	5:40	5:40	5:39	5:39	5:39	5:38	5:38	5:37	5:37	5:37	5:36	5:36	5:35	5:35	5:34	5:34	5:34	5:33	5:33	5:32	5:32	5:32	5:31	5:31	5:30	5:30	5:30	5:29	5:29	5:28

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	5:38	5:40
2	12.0	5:38	5:40
3	12.0	5:38	5:39
4	12.0	5:37	5:39
5	12.0	5:37	5:39
6	12.0	5:37	5:38
7	12.0	5:37	5:38
8	12.0	5:36	5:37
9	12.0	5:36	5:37
10	12.0	5:36	5:37
11	12.0	5:35	5:36
12	12.0	5:35	5:36
13	12.0	5:35	5:35
14	12.0	5:34	5:35
15	12.0	5:34	5:34
16	12.0	5:34	5:34
17	12.0	5:33	5:34
18	12.0	5:33	5:33
19	12.0	5:33	5:33
20	12.0	5:32	5:32
21	12.0	5:32	5:32
22	12.0	5:32	5:32
23	12.0	5:31	5:31
24	12.0	5:31	5:31
25	12.0	5:31	5:30
26	12.0	5:30	5:30
27	12.0	5:30	5:30
28	12.0	5:30	5:29
29	12.0	5:29	5:29
30	12.0	5:29	5:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.37 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.14 kWh/m² to a high of 6.37 kWh/m² in September across the year — September's 6.37 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)	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.3	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4	6.4
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	6.3	Intense
2	6.3	Intense
3	6.3	Intense
4	6.3	Intense
5	6.3	Intense
6	6.3	Intense
7	6.3	Intense
8	6.3	Intense
9	6.3	Intense
10	6.3	Intense
11	6.3	Intense
12	6.3	Intense
13	6.3	Intense
14	6.3	Intense
15	6.3	Intense
16	6.3	Intense
17	6.4	Intense
18	6.4	Intense
19	6.4	Intense
20	6.4	Intense
21	6.4	Intense
22	6.4	Intense
23	6.4	Intense
24	6.4	Intense
25	6.4	Intense
26	6.4	Intense
27	6.4	Intense
28	6.4	Intense
29	6.4	Intense
30	6.4	Intense

Planning a trip in September

Is September a good time to visit Bitung?

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

5.3

Sightseeing

2nd-best month of the year

6.6

Beach & pool

2nd-best month of the year

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

What to pack for Bitung in September

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

In September, Bitung sees daytime highs around 29°C and nights near 25°C. Pack light clothes and sun protection. Worth having: rain gear. About 11 days see rain.

light clothessun protectionrain gear

Sea temperature near Bitung in September

The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in May at about 29°C and coldest in August near 28°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	29	29	28	28	28	29	29	29
Comfort	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Tropical	Warm	Tropical	Tropical	Tropical	Tropical

	Sea temperature (°C)	Comfort
Jan	29	Tropical
Feb	29	Tropical
Mar	29	Tropical
Apr	29	Tropical
May	29	Tropical
Jun	29	Tropical
Jul	28	Tropical
Aug	28	Warm
Sep	28	Tropical
Oct	29	Tropical
Nov	29	Tropical
Dec	29	Tropical

UV index in Bitung 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 Bitung peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 13 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)	14	15	15	14	12	12	11	12	13	13	12	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

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

Location & terrain

Where is Bitung?

Bitung sits at 1.4°N, 125.1°E, 21 m above sea level, in Indonesia. The nearest listed city is Tondano, 28 km away.

Topography around Bitung

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

Within 3 km, the terrain around Bitung has significant variations in elevation — a maximum elevation change of 252 m around an average of 58 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,978 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,962 m.

The land around Bitung is covered by trees (41%), artificial surfaces (26%) and water (24%) within 3 km, trees (60%) and water (33%) within 16 km, and water (72%) and trees (25%) within 80 km.

3 km

252 m

trees 41%

16 km

1,978 m

trees 60%

80 km

1,962 m

water 72%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Tondano 28 km · Manado 31 km · Tomohon 39 km · Tahuna 245 km · Gorontalo 251 km · Ternate 261 km · Sofifi 281 km · Tobelo 322 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 Bitung (1.4406°, 125.1282°, elevation 21 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. 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	29	25
2	29	25
3	29	25
4	29	25
5	29	25
6	29	25
7	29	25
8	29	25
9	29	25
10	29	25
11	29	25
12	29	25
13	29	25
14	29	25
15	29	25
16	29	25
17	29	25
18	29	25
19	29	25
20	29	25
21	29	25
22	29	25
23	29	25
24	29	25
25	29	25
26	29	25
27	29	25
28	29	25
29	29	25
30	29	25

	Clearer (%)	Cloudier (%)
1	47	53
2	47	53
3	45	55
4	44	56
5	44	56
6	44	56
7	43	57
8	42	58
9	43	57
10	43	57
11	41	59
12	41	59
13	42	58
14	41	59
15	42	58
16	42	58
17	43	57
18	43	57
19	44	56
20	44	56
21	45	55
22	45	55
23	45	55
24	45	55
25	45	55
26	43	57
27	43	57
28	42	58
29	42	58
30	41	59

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	36
7	37
8	37
9	37
10	38
11	38
12	38
13	39
14	39
15	39
16	39
17	39
18	39
19	39
20	39
21	38
22	38
23	38
24	39
25	39
26	39
27	39
28	40
29	40
30	41

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	90	6
2	4	89	7
3	4	89	7
4	5	88	7
5	5	88	7
6	5	87	8
7	6	86	8
8	6	85	9
9	6	85	9
10	6	84	10
11	6	84	10
12	6	83	11
13	6	83	11
14	6	82	12
15	6	82	12
16	6	81	13
17	6	81	13
18	5	82	13
19	5	81	14
20	5	81	14
21	4	82	14
22	4	82	14
23	4	81	15
24	3	82	15
25	3	82	15
26	3	82	15
27	3	81	16
28	2	82	16
29	2	82	16
30	2	81	17

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

	Clearer (%)	Cloudier (%)
1	47	53
2	47	53
3	45	55
4	44	56
5	44	56
6	44	56
7	43	57
8	42	58
9	43	57
10	43	57
11	41	59
12	41	59
13	42	58
14	41	59
15	42	58
16	42	58
17	43	57
18	43	57
19	44	56
20	44	56
21	45	55
22	45	55
23	45	55
24	45	55
25	45	55
26	43	57
27	43	57
28	42	58
29	42	58
30	41	59

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	36
7	37
8	37
9	37
10	38
11	38
12	38
13	39
14	39
15	39
16	39
17	39
18	39
19	39
20	39
21	38
22	38
23	38
24	39
25	39
26	39
27	39
28	40
29	40
30	41

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	90	6
2	4	89	7
3	4	89	7
4	5	88	7
5	5	88	7
6	5	87	8
7	6	86	8
8	6	85	9
9	6	85	9
10	6	84	10
11	6	84	10
12	6	83	11
13	6	83	11
14	6	82	12
15	6	82	12
16	6	81	13
17	6	81	13
18	5	82	13
19	5	81	14
20	5	81	14
21	4	82	14
22	4	82	14
23	4	81	15
24	3	82	15
25	3	82	15
26	3	82	15
27	3	81	16
28	2	82	16
29	2	82	16
30	2	81	17

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

	Clearer (%)	Cloudier (%)
1	47	53
2	47	53
3	45	55
4	44	56
5	44	56
6	44	56
7	43	57
8	42	58
9	43	57
10	43	57
11	41	59
12	41	59
13	42	58
14	41	59
15	42	58
16	42	58
17	43	57
18	43	57
19	44	56
20	44	56
21	45	55
22	45	55
23	45	55
24	45	55
25	45	55
26	43	57
27	43	57
28	42	58
29	42	58
30	41	59

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	36
7	37
8	37
9	37
10	38
11	38
12	38
13	39
14	39
15	39
16	39
17	39
18	39
19	39
20	39
21	38
22	38
23	38
24	39
25	39
26	39
27	39
28	40
29	40
30	41

	Muggy (%)	Oppressive (%)	Miserable (%)
1	4	90	6
2	4	89	7
3	4	89	7
4	5	88	7
5	5	88	7
6	5	87	8
7	6	86	8
8	6	85	9
9	6	85	9
10	6	84	10
11	6	84	10
12	6	83	11
13	6	83	11
14	6	82	12
15	6	82	12
16	6	81	13
17	6	81	13
18	5	82	13
19	5	81	14
20	5	81	14
21	4	82	14
22	4	82	14
23	4	81	15
24	3	82	15
25	3	82	15
26	3	82	15
27	3	81	16
28	2	82	16
29	2	82	16
30	2	81	17