Tondano weather in September

In September, Tondano sees average daytime highs of 27°C and overnight lows near 23°C, with 124 mm of rain across 16.7 wet days and about 12 hours of daylight. It is the 9th-warmest and 11th-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 17% 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 Tondano's 2nd-clearest and 3rd-windiest month. For the whole year in context, see Tondano's year-round climate.

Daytime high: 27°; 9th warmest
Overnight low: 23°; 2nd coldest
Rainfall: 124 mm; 16.7 wet days
Daylight: 12 hours; 5:34 AM – 5:35 PM
Cloud cover: 67%; 2nd clearest
Wind: 11 km/h; 3rd windiest
Solar energy: 6.31 kWh/m²
Travel score: 5.2; out of 10

Tondano is capital of Minahasa Regency, North Sulawesi, Indonesia.

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

← August Tondano 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 27°C through the month.

A typical September day in Tondano reaches about 27°C in the afternoon and slips back to 23°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 26°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	27	27	27	27	28	28	28	28	28	28	28	28
Avg low (°C)	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

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

Tondano weather by month

How September compares with the rest of the year at a glance. September is the 9th-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	27° / 23°	215	27.4	11.9	3.7
Feb	28° / 23°	206	23	12	4.0
Mar	28° / 23°	218	25.8	12	4.0
Apr	28° / 24°	273	26.6	12	3.7
May	28° / 24°	278	28.1	12.1	3.7
Jun	27° / 23°	267	25.8	12.1	3.9
Jul	27° / 23°	195	22.4	12.1	4.6
Aug	27° / 23°	118	17.2	12	5.4
Sep	27° / 23°	124	16.7	12	5.2
Oct	28° / 23°	193	21.8	12	4.6
Nov	28° / 24°	244	27.4	11.9	3.6
Dec	28° / 24°	239	28.8	11.9	3.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 62%.

	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 (%)	39	38	38	38	37	37	37	36	37	36	37	37	37	38	38	38	38	38	39	40	40	40	39	40	40	39	39	38	38	36
Cloudier (%)	61	62	62	62	63	63	63	64	63	64	63	63	63	62	62	62	62	62	61	60	60	60	61	60	60	61	61	62	62	64

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	38	62
5	37	63
6	37	63
7	37	63
8	36	64
9	37	63
10	36	64
11	37	63
12	37	63
13	37	63
14	38	62
15	38	62
16	38	62
17	38	62
18	38	62
19	39	61
20	40	60
21	40	60
22	40	60
23	39	61
24	40	60
25	40	60
26	39	61
27	39	61
28	38	62
29	38	62
30	36	64

Chance of precipitation in September

Any precipitation

Tondano gets around 124 mm of rain over 16.7 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 57% and peaks near 60% 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 (%)	59	59	59	58	58	58	57	57	57	57	57	57	57	57	57	57	57	56	56	56	56	56	56	56	57	57	58	58	59	60

	Rain chance (%)
1	59
2	59
3	59
4	58
5	58
6	58
7	57
8	57
9	57
10	57
11	57
12	57
13	57
14	57
15	57
16	57
17	57
18	56
19	56
20	56
21	56
22	56
23	56
24	56
25	57
26	57
27	58
28	58
29	59
30	60

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 78% 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
Humid (%)	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0
Muggy (%)	20	21	21	21	22	22	23	23	23	23	23	23	23	23	23	22	22	22	21	21	21	20	20	20	19	19	19	19	19	19
Oppressive (%)	80	79	79	79	78	78	77	77	77	77	77	76	76	76	76	77	77	77	78	78	78	80	80	80	81	81	81	81	81	81

	Humid (%)	Muggy (%)	Oppressive (%)
1	0	20	80
2	0	21	79
3	0	21	79
4	0	21	79
5	0	22	78
6	0	22	78
7	0	23	77
8	0	23	77
9	0	23	77
10	0	23	77
11	0	23	77
12	1	23	76
13	1	23	76
14	1	23	76
15	1	23	76
16	1	22	77
17	1	22	77
18	1	22	77
19	1	21	78
20	1	21	78
21	1	21	78
22	0	20	80
23	0	20	80
24	0	20	80
25	0	19	81
26	0	19	81
27	0	19	81
28	0	19	81
29	0	19	81
30	0	19	81

Wind in September

Winds average 11 km/h in September.

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

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

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.31 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 5.05 kWh/m² to a high of 6.31 kWh/m² in September across the year — September's 6.31 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)	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	6.2	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
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	6.2	Intense
2	6.2	Intense
3	6.2	Intense
4	6.2	Intense
5	6.2	Intense
6	6.2	Intense
7	6.2	Intense
8	6.2	Intense
9	6.2	Intense
10	6.2	Intense
11	6.2	Intense
12	6.2	Intense
13	6.3	Intense
14	6.3	Intense
15	6.3	Intense
16	6.3	Intense
17	6.3	Intense
18	6.3	Intense
19	6.3	Intense
20	6.3	Intense
21	6.3	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 Tondano?

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

5.2

Sightseeing

2nd-best month of the year

5.4

Beach & pool

1st-best month of the year

September is a reasonable time to visit Tondano for sightseeing.

What to pack for Tondano in September

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

In September, Tondano sees daytime highs around 27°C and nights near 23°C. Pack light clothes, rain gear and sun protection. About 17 days see rain.

light clothesrain gearsun protection

Sea temperature near Tondano 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 at the nearest coast (about 25 km away) 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 Tondano 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 Tondano 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 Tondano?

Tondano sits at 1.3°N, 124.9°E, 693 m above sea level, in Indonesia. The nearest listed city is Tomohon, 12 km away.

Topography around Tondano

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

Within 3 km, the terrain around Tondano has significant variations in elevation — a maximum elevation change of 276 m around an average of 710 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,537 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,962 m.

The land around Tondano is covered by trees (43%) and grassland (21%) within 3 km, trees (78%) within 16 km, and water (67%) and trees (30%) within 80 km.

3 km

276 m

trees 43%

16 km

1,537 m

trees 78%

80 km

1,962 m

water 67%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Tomohon 12 km · Manado 21 km · Bitung 28 km · Gorontalo 223 km · Tahuna 264 km · Ternate 281 km · Sofifi 301 km · Luwuk 345 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 Tondano (1.3054°, 124.9126°, elevation 693 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	27	22
2	27	22
3	27	22
4	27	22
5	27	22
6	27	22
7	27	22
8	27	22
9	27	22
10	27	23
11	27	23
12	27	23
13	27	23
14	27	23
15	27	23
16	27	23
17	27	23
18	27	23
19	27	23
20	27	23
21	27	23
22	27	23
23	28	23
24	28	23
25	28	23
26	28	23
27	28	23
28	28	23
29	28	23
30	28	23

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	38	62
5	37	63
6	37	63
7	37	63
8	36	64
9	37	63
10	36	64
11	37	63
12	37	63
13	37	63
14	38	62
15	38	62
16	38	62
17	38	62
18	38	62
19	39	61
20	40	60
21	40	60
22	40	60
23	39	61
24	40	60
25	40	60
26	39	61
27	39	61
28	38	62
29	38	62
30	36	64

	Rain chance (%)
1	59
2	59
3	59
4	58
5	58
6	58
7	57
8	57
9	57
10	57
11	57
12	57
13	57
14	57
15	57
16	57
17	57
18	56
19	56
20	56
21	56
22	56
23	56
24	56
25	57
26	57
27	58
28	58
29	59
30	60

	Humid (%)	Muggy (%)	Oppressive (%)
1	0	20	80
2	0	21	79
3	0	21	79
4	0	21	79
5	0	22	78
6	0	22	78
7	0	23	77
8	0	23	77
9	0	23	77
10	0	23	77
11	0	23	77
12	1	23	76
13	1	23	76
14	1	23	76
15	1	23	76
16	1	22	77
17	1	22	77
18	1	22	77
19	1	21	78
20	1	21	78
21	1	21	78
22	0	20	80
23	0	20	80
24	0	20	80
25	0	19	81
26	0	19	81
27	0	19	81
28	0	19	81
29	0	19	81
30	0	19	81

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

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	38	62
5	37	63
6	37	63
7	37	63
8	36	64
9	37	63
10	36	64
11	37	63
12	37	63
13	37	63
14	38	62
15	38	62
16	38	62
17	38	62
18	38	62
19	39	61
20	40	60
21	40	60
22	40	60
23	39	61
24	40	60
25	40	60
26	39	61
27	39	61
28	38	62
29	38	62
30	36	64

	Rain chance (%)
1	59
2	59
3	59
4	58
5	58
6	58
7	57
8	57
9	57
10	57
11	57
12	57
13	57
14	57
15	57
16	57
17	57
18	56
19	56
20	56
21	56
22	56
23	56
24	56
25	57
26	57
27	58
28	58
29	59
30	60

	Humid (%)	Muggy (%)	Oppressive (%)
1	0	20	80
2	0	21	79
3	0	21	79
4	0	21	79
5	0	22	78
6	0	22	78
7	0	23	77
8	0	23	77
9	0	23	77
10	0	23	77
11	0	23	77
12	1	23	76
13	1	23	76
14	1	23	76
15	1	23	76
16	1	22	77
17	1	22	77
18	1	22	77
19	1	21	78
20	1	21	78
21	1	21	78
22	0	20	80
23	0	20	80
24	0	20	80
25	0	19	81
26	0	19	81
27	0	19	81
28	0	19	81
29	0	19	81
30	0	19	81

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

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	38	62
5	37	63
6	37	63
7	37	63
8	36	64
9	37	63
10	36	64
11	37	63
12	37	63
13	37	63
14	38	62
15	38	62
16	38	62
17	38	62
18	38	62
19	39	61
20	40	60
21	40	60
22	40	60
23	39	61
24	40	60
25	40	60
26	39	61
27	39	61
28	38	62
29	38	62
30	36	64

	Rain chance (%)
1	59
2	59
3	59
4	58
5	58
6	58
7	57
8	57
9	57
10	57
11	57
12	57
13	57
14	57
15	57
16	57
17	57
18	56
19	56
20	56
21	56
22	56
23	56
24	56
25	57
26	57
27	58
28	58
29	59
30	60

	Humid (%)	Muggy (%)	Oppressive (%)
1	0	20	80
2	0	21	79
3	0	21	79
4	0	21	79
5	0	22	78
6	0	22	78
7	0	23	77
8	0	23	77
9	0	23	77
10	0	23	77
11	0	23	77
12	1	23	76
13	1	23	76
14	1	23	76
15	1	23	76
16	1	22	77
17	1	22	77
18	1	22	77
19	1	21	78
20	1	21	78
21	1	21	78
22	0	20	80
23	0	20	80
24	0	20	80
25	0	19	81
26	0	19	81
27	0	19	81
28	0	19	81
29	0	19	81
30	0	19	81