Tomohon weather in September

In September, Tomohon sees average daytime highs of 29°C and overnight lows near 21°C, with 189 mm of rain across 19.5 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-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 12% 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 Tomohon's 2nd-clearest and 7th-windiest month. For the whole year in context, see Tomohon's year-round climate.

Daytime high: 29°; 2nd warmest
Overnight low: 21°; 1st coldest
Rainfall: 189 mm; 19.5 wet days
Daylight: 12 hours; 5:35 AM – 5:35 PM
Cloud cover: 71%; 2nd clearest
Wind: 5 km/h; 7th windiest
Solar energy: 6.16 kWh/m²
Travel score: 4.1; out of 10

Tomohon is city in North Sulawesi Province, Indonesia.

Density: 188/km²; people per km²
Founded: 2003

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

← August Tomohon 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 29°C through the month.

A typical September day in Tomohon 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 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)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22

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

How September really feels in Tomohon

Once humidity and wind are folded in, September averages 5 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.

Tomohon weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 22°	304	28.9	11.9	3.5
Feb	28° / 22°	282	25.3	12	3.6
Mar	28° / 22°	295	28.4	12	3.3
Apr	29° / 22°	332	27.4	12	3.2
May	29° / 23°	354	29	12.1	3.1
Jun	28° / 22°	339	26.3	12.1	3.6
Jul	28° / 22°	253	23.3	12.1	4.3
Aug	28° / 22°	166	18.4	12	4.6
Sep	29° / 21°	189	19.5	12	4.1
Oct	29° / 22°	276	24.7	12	3.5
Nov	29° / 22°	319	28.7	11.9	3.0
Dec	28° / 22°	323	30	11.9	3.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% 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 69%.

	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 (%)	32	31	31	30	30	31	30	30	29	29	29	30	30	31	30	30	31	31	31	31	32	33	33	33	33	31	31	30	30	28
Cloudier (%)	68	69	69	70	70	69	70	70	71	71	71	70	70	69	70	70	69	69	69	69	68	67	67	67	67	69	69	70	70	72

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	30	70
5	30	70
6	31	69
7	30	70
8	30	70
9	29	71
10	29	71
11	29	71
12	30	70
13	30	70
14	31	69
15	30	70
16	30	70
17	31	69
18	31	69
19	31	69
20	31	69
21	32	68
22	33	67
23	33	67
24	33	67
25	33	67
26	31	69
27	31	69
28	30	70
29	30	70
30	28	72

Chance of precipitation in September

Any precipitation

Tomohon gets around 189 mm of rain over 19.5 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 66% and peaks near 69% 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 (%)	67	67	67	67	66	66	66	66	66	66	66	66	66	66	66	66	66	66	65	65	65	65	65	66	66	66	67	68	68	69

	Rain chance (%)
1	67
2	67
3	67
4	67
5	66
6	66
7	66
8	66
9	66
10	66
11	66
12	66
13	66
14	66
15	66
16	66
17	66
18	66
19	65
20	65
21	65
22	65
23	65
24	66
25	66
26	66
27	67
28	68
29	68
30	69

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 99% 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
Humid (%)	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	0	0	0
Muggy (%)	27	27	27	27	27	27	27	27	27	26	26	26	25	25	25	25	25	25	24	24	24	24	23	23	23	22	22	22	22	21
Oppressive (%)	72	72	72	72	72	71	71	71	71	72	72	72	73	73	73	73	73	74	75	75	75	75	76	76	76	77	77	78	78	79

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	27	72
2	1	27	72
3	1	27	72
4	1	27	72
5	1	27	72
6	2	27	71
7	2	27	71
8	2	27	71
9	2	27	71
10	2	26	72
11	2	26	72
12	2	26	72
13	2	25	73
14	2	25	73
15	2	25	73
16	2	25	73
17	2	25	73
18	1	25	74
19	1	24	75
20	1	24	75
21	1	24	75
22	1	24	75
23	1	23	76
24	1	23	76
25	1	23	76
26	1	22	77
27	1	22	77
28	0	22	78
29	0	22	78
30	0	21	79

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 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)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	4	4	4	4	4	4	4	4	4
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	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	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 5:40 AM to 5:30 AM, and sunset from 5:41 PM to 5:30 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)	5:40	5:39	5:39	5:39	5:39	5:38	5:38	5:38	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
Sunset (PM)	5:41	5:41	5:41	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	5:35	5:34	5:34	5:33	5:33	5:32	5:32	5:32	5:31	5:31	5:31	5:30	5:30

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	5:40	5:41
2	12.0	5:39	5:41
3	12.0	5:39	5:41
4	12.0	5:39	5:40
5	12.0	5:39	5:40
6	12.0	5:38	5:39
7	12.0	5:38	5:39
8	12.0	5:38	5:39
9	12.0	5:37	5:38
10	12.0	5:37	5:38
11	12.0	5:37	5:37
12	12.0	5:36	5:37
13	12.0	5:36	5:37
14	12.0	5:36	5:36
15	12.0	5:35	5:36
16	12.0	5:35	5:35
17	12.0	5:35	5:35
18	12.0	5:34	5:35
19	12.0	5:34	5:34
20	12.0	5:34	5:34
21	12.0	5:33	5:33
22	12.0	5:33	5:33
23	12.0	5:33	5:32
24	12.0	5:32	5:32
25	12.0	5:32	5:32
26	12.0	5:32	5:31
27	12.0	5:31	5:31
28	12.0	5:31	5:31
29	12.0	5:31	5:30
30	12.0	5:30	5:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.16 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.89 kWh/m² to a high of 6.16 kWh/m² in September across the year — September's 6.16 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)	6.0	6.0	6.0	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2
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	6.0	Intense
2	6.0	Intense
3	6.0	Intense
4	6.1	Intense
5	6.1	Intense
6	6.1	Intense
7	6.1	Intense
8	6.1	Intense
9	6.1	Intense
10	6.1	Intense
11	6.1	Intense
12	6.1	Intense
13	6.1	Intense
14	6.1	Intense
15	6.1	Intense
16	6.1	Intense
17	6.2	Intense
18	6.2	Intense
19	6.2	Intense
20	6.2	Intense
21	6.2	Intense
22	6.2	Intense
23	6.2	Intense
24	6.2	Intense
25	6.2	Intense
26	6.2	Intense
27	6.2	Intense
28	6.2	Intense
29	6.2	Intense
30	6.2	Intense

Planning a trip in September

Is September a good time to visit Tomohon?

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

4.1

Sightseeing

3rd-best month of the year

5.2

Beach & pool

2nd-best month of the year

September is a reasonable time to visit Tomohon for sightseeing.

What to pack for Tomohon in September

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

In September, Tomohon sees daytime highs around 29°C and nights near 21°C. Pack light clothes, rain gear and sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near Tomohon 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 21 km away) is warmest in June at about 30°C and coldest in February 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	30	29	29	29	30	29	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	30	Tropical
Jul	29	Tropical
Aug	29	Tropical
Sep	29	Tropical
Oct	30	Tropical
Nov	29	Tropical
Dec	29	Tropical

UV index in Tomohon 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 Tomohon peaks around March 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 19 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	12	13	14	14	11	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	12	Extreme
Aug	13	Extreme
Sep	14	Extreme
Oct	14	Extreme
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Tomohon?

Tomohon sits at 1.3°N, 124.8°E, 734 m above sea level, in Indonesia. The nearest listed city is Tondano, 12 km away.

Topography around Tomohon

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

Within 3 km, the terrain around Tomohon has significant variations in elevation — a maximum elevation change of 490 m around an average of 719 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,565 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,962 m.

The land around Tomohon is covered by trees (80%) within 3 km, trees (79%) within 16 km, and water (65%) and trees (32%) within 80 km.

3 km

490 m

trees 80%

16 km

1,565 m

trees 79%

80 km

1,962 m

water 65%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Tondano 12 km · Manado 19 km · Bitung 39 km · Gorontalo 212 km · Tahuna 266 km · Ternate 293 km · Sofifi 313 km · Luwuk 337 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 Tomohon (1.3168°, 124.8038°, elevation 734 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	21
2	29	21
3	29	21
4	29	21
5	29	21
6	29	21
7	29	21
8	29	21
9	29	21
10	29	21
11	29	21
12	29	21
13	29	21
14	29	21
15	29	21
16	29	21
17	29	21
18	29	21
19	29	21
20	29	21
21	29	21
22	29	21
23	29	21
24	29	21
25	29	21
26	29	21
27	29	22
28	29	22
29	29	22
30	29	22

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	30	70
5	30	70
6	31	69
7	30	70
8	30	70
9	29	71
10	29	71
11	29	71
12	30	70
13	30	70
14	31	69
15	30	70
16	30	70
17	31	69
18	31	69
19	31	69
20	31	69
21	32	68
22	33	67
23	33	67
24	33	67
25	33	67
26	31	69
27	31	69
28	30	70
29	30	70
30	28	72

	Rain chance (%)
1	67
2	67
3	67
4	67
5	66
6	66
7	66
8	66
9	66
10	66
11	66
12	66
13	66
14	66
15	66
16	66
17	66
18	66
19	65
20	65
21	65
22	65
23	65
24	66
25	66
26	66
27	67
28	68
29	68
30	69

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	27	72
2	1	27	72
3	1	27	72
4	1	27	72
5	1	27	72
6	2	27	71
7	2	27	71
8	2	27	71
9	2	27	71
10	2	26	72
11	2	26	72
12	2	26	72
13	2	25	73
14	2	25	73
15	2	25	73
16	2	25	73
17	2	25	73
18	1	25	74
19	1	24	75
20	1	24	75
21	1	24	75
22	1	24	75
23	1	23	76
24	1	23	76
25	1	23	76
26	1	22	77
27	1	22	77
28	0	22	78
29	0	22	78
30	0	21	79

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

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	30	70
5	30	70
6	31	69
7	30	70
8	30	70
9	29	71
10	29	71
11	29	71
12	30	70
13	30	70
14	31	69
15	30	70
16	30	70
17	31	69
18	31	69
19	31	69
20	31	69
21	32	68
22	33	67
23	33	67
24	33	67
25	33	67
26	31	69
27	31	69
28	30	70
29	30	70
30	28	72

	Rain chance (%)
1	67
2	67
3	67
4	67
5	66
6	66
7	66
8	66
9	66
10	66
11	66
12	66
13	66
14	66
15	66
16	66
17	66
18	66
19	65
20	65
21	65
22	65
23	65
24	66
25	66
26	66
27	67
28	68
29	68
30	69

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	27	72
2	1	27	72
3	1	27	72
4	1	27	72
5	1	27	72
6	2	27	71
7	2	27	71
8	2	27	71
9	2	27	71
10	2	26	72
11	2	26	72
12	2	26	72
13	2	25	73
14	2	25	73
15	2	25	73
16	2	25	73
17	2	25	73
18	1	25	74
19	1	24	75
20	1	24	75
21	1	24	75
22	1	24	75
23	1	23	76
24	1	23	76
25	1	23	76
26	1	22	77
27	1	22	77
28	0	22	78
29	0	22	78
30	0	21	79

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

	Clearer (%)	Cloudier (%)
1	32	68
2	31	69
3	31	69
4	30	70
5	30	70
6	31	69
7	30	70
8	30	70
9	29	71
10	29	71
11	29	71
12	30	70
13	30	70
14	31	69
15	30	70
16	30	70
17	31	69
18	31	69
19	31	69
20	31	69
21	32	68
22	33	67
23	33	67
24	33	67
25	33	67
26	31	69
27	31	69
28	30	70
29	30	70
30	28	72

	Rain chance (%)
1	67
2	67
3	67
4	67
5	66
6	66
7	66
8	66
9	66
10	66
11	66
12	66
13	66
14	66
15	66
16	66
17	66
18	66
19	65
20	65
21	65
22	65
23	65
24	66
25	66
26	66
27	67
28	68
29	68
30	69

	Humid (%)	Muggy (%)	Oppressive (%)
1	1	27	72
2	1	27	72
3	1	27	72
4	1	27	72
5	1	27	72
6	2	27	71
7	2	27	71
8	2	27	71
9	2	27	71
10	2	26	72
11	2	26	72
12	2	26	72
13	2	25	73
14	2	25	73
15	2	25	73
16	2	25	73
17	2	25	73
18	1	25	74
19	1	24	75
20	1	24	75
21	1	24	75
22	1	24	75
23	1	23	76
24	1	23	76
25	1	23	76
26	1	22	77
27	1	22	77
28	0	22	78
29	0	22	78
30	0	21	79