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Port Moresby, Papua New Guinea climate

Aw Tropical savanna (dry winter)

Port Moresby has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is December with an average daily high near 91°F, while the coldest is July averaging around 73°F at night. Precipitation totals about 42 inches a year and is strongly seasonal — March alone averages 7.7 inches while September barely receives 0.43 inches.

☀️ All year

Hot

Daytime highs near 91°F most of the year.

About 53 days a year above 90 °F

🌙 Nights

Stays warm

Even the coolest nights stay near 73°F.

🌧️ Rain

Wet

About 42 in of rain a year.

Wettest in March

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

+0.3 °F 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

Port Moresby climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	90	89	89	88	87	87	86	86	88	89	91	91
Avg temp (°F)	83	82	81	81	81	80	79	79	80	82	83	83
Avg low (°F)	75	75	74	74	74	73	73	73	73	74	75	75
Precipitation (in)	6.5	7.5	7.7	5.7	4.3	0.7	1.0	0.9	0.4	1.2	2.2	4.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	90	89	89	88	87	87
Avg temp (°F)	83	82	81	81	81	80
Avg low (°F)	75	75	74	74	74	73
Precipitation (in)	6.5	7.5	7.7	5.7	4.3	0.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	86	86	88	89	91	91
Avg temp (°F)	79	79	80	82	83	83
Avg low (°F)	73	73	73	74	75	75
Precipitation (in)	1.0	0.9	0.4	1.2	2.2	4.2

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	10	12	8	4	3	2	2	3	3	4	7
Days with high ≥ 90°F (days)	9	6	4	3	2	0.9	0.5	0.9	2	5	9	9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	10	12	8	4	3
Days with high ≥ 90°F (days)	9	6	4	3	2	0.9

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	2	2	3	3	4	7
Days with high ≥ 90°F (days)	0.5	0.9	2	5	9	9

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	84	85	85	77	71	68	69	69	71	70	73	78
Clear days (≤ 30% cloud)	0.2	0.3	0.1	0.8	2	2	1	2	1	1	1.0	0.5
Partly cloudy days (30–70%)	6	5	5	9	11	12	13	14	12	14	11	9
Cloudy days (≥ 70%)	25	23	26	20	18	16	16	16	16	16	18	22
Relative humidity (%)	81	84	85	85	83	79	74	71	66	66	70	76
Wind speed (mph)	5.3	5.3	4.9	5.1	5.8	6.5	7.4	7.5	7.4	6.8	5.8	5.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	84	85	85	77	71	68
Clear days (≤ 30% cloud)	0.2	0.3	0.1	0.8	2	2
Partly cloudy days (30–70%)	6	5	5	9	11	12
Cloudy days (≥ 70%)	25	23	26	20	18	16
Relative humidity (%)	81	84	85	85	83	79
Wind speed (mph)	5.3	5.3	4.9	5.1	5.8	6.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	69	69	71	70	73	78
Clear days (≤ 30% cloud)	1	2	1	1	1.0	0.5
Partly cloudy days (30–70%)	13	14	12	14	11	9
Cloudy days (≥ 70%)	16	16	16	16	18	22
Relative humidity (%)	74	71	66	66	70	76
Wind speed (mph)	7.4	7.5	7.4	6.8	5.8	5.1

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 13 years of daily observations at Port Moresby W.o., a weather station, about 13 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 →