Medan, Indonesia climate

Aw Tropical savanna (dry winter)

Medan has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 33°C, while the coldest is December averaging around 23°C at night. Around 1092 mm of precipitation falls each year, peaking in August (148 mm) and easing off in February (46 mm).

☀️ All year

Hot

Daytime highs near 33°C most of the year.

About 151 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 23°C.

🌧️ Rain

Wet

About 1092 mm of rain a year.

Wettest in August

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

+0.2 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Medan climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	32	33	33	33	33	33	32	32	31	31	31
Avg temp (°C)	27	28	28	29	29	28	28	28	28	27	27	27
Avg low (°C)	23	23	24	24	24	24	23	23	23	23	24	23
Precipitation (mm)	62	46	64	74	55	109	52	148	143	116	132	91

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	31	32	33	33	33	33
Avg temp (°C)	27	28	28	29	29	28
Avg low (°C)	23	23	24	24	24	24
Precipitation (mm)	62	46	64	74	55	109

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	32	32	31	31	31
Avg temp (°C)	28	28	28	27	27	27
Avg low (°C)	23	23	23	23	24	23
Precipitation (mm)	52	148	143	116	132	91

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	2	1	2	2	2	2	3	3	3	4	4
Days with high ≥ 32°C (days)	7	11	18	18	18	18	17	16	11	8	6	4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	2	2	1	2	2	2
Days with high ≥ 32°C (days)	7	11	18	18	18	18

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	3	3	3	4	4
Days with high ≥ 32°C (days)	17	16	11	8	6	4

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	83	79	80	84	86	83	84	89	90	91	92	90
Clear days (≤ 30% cloud)	0.5	0.7	0.9	0.4	0.4	0.7	0.6	0.1	0.0	0.0	0.0	0.1
Partly cloudy days (30–70%)	6	7	7	5	4	6	5	3	2	2	2	3
Cloudy days (≥ 70%)	24	20	23	25	26	24	25	28	28	29	28	28
Relative humidity (%)	88	86	85	85	85	84	83	84	85	87	89	89
Wind speed (mph)	3.0	2.9	2.8	2.5	2.3	2.3	2.3	2.4	2.3	2.5	2.6	3.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	83	79	80	84	86	83
Clear days (≤ 30% cloud)	0.5	0.7	0.9	0.4	0.4	0.7
Partly cloudy days (30–70%)	6	7	7	5	4	6
Cloudy days (≥ 70%)	24	20	23	25	26	24
Relative humidity (%)	88	86	85	85	85	84
Wind speed (mph)	3.0	2.9	2.8	2.5	2.3	2.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	84	89	90	91	92	90
Clear days (≤ 30% cloud)	0.6	0.1	0.0	0.0	0.0	0.1
Partly cloudy days (30–70%)	5	3	2	2	2	3
Cloudy days (≥ 70%)	25	28	28	29	28	28
Relative humidity (%)	83	84	85	87	89	89
Wind speed (mph)	2.3	2.4	2.3	2.5	2.6	3.0

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 26 years of daily observations at Polonia, a weather station, about 3 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →