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Portofino vs Hiroshima

Csa Hot-summer MediterraneanCfa Humid subtropical

Comparing Portofino change · Hiroshima change

Bottom line

Portofino and Hiroshima have nearly identical year-round temperatures; Hiroshima is the wetter, with 626 mm more rain a year, and Portofino the sunnier.

Year-round temp About the same within 1°C on the year

Wetter Hiroshima 626 mm more a year

Sunnier Portofino 18 pp less cloud

Colder winters Hiroshima 4°C colder nights

How the seasons compare

The differences between Portofino and Hiroshima, in everyday terms.

Summers

Hiroshima has much hotter summers

Portofino: Warm
Hiroshima: Hot

Winters

Portofino has milder winters

Portofino: Cool
Hiroshima: Chilly

Rain & snow

Hiroshima is wetter

Portofino: Moderate rainfall
Hiroshima: Very wet

Sky

Portofino is sunnier

Portofino: Partly cloudy
Hiroshima: Often grey

Month-by-month charts

Temperature

Portofino and Hiroshima run remarkably close all year.

Precipitation

Hiroshima is the wetter — about 626 mm more across the year.

Clear skies

Portofino has the clearer skies — the higher line.

Exact monthly numbers

Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.

Avg high (°C) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	12	13	—	18	—	25	28	28	25	21	16	13
Hiroshima	10	11	15	20	24	27	31	33	29	24	18	12
Difference	-2	-2	—	+2	—	+2	+3	+5	+4	+3	+2	-1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Portofino	12	13	—	18	—	25
Hiroshima	10	11	15	20	24	27
Difference	-2	-2	—	+2	—	+2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	28	28	25	21	16	13
Hiroshima	31	33	29	24	18	12
Difference	+3	+5	+4	+3	+2	-1

Avg low (°C) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	6	7	9	12	—	19	22	22	19	15	10	7
Hiroshima	2	2	5	10	15	20	24	25	21	15	9	4
Difference	-4	-4	-4	-1	—	+1	+3	+4	+3	—	-1	-3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Portofino	6	7	9	12	—	19
Hiroshima	2	2	5	10	15	20
Difference	-4	-4	-4	-1	—	+1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	22	22	19	15	10	7
Hiroshima	24	25	21	15	9	4
Difference	+3	+4	+3	—	-1	-3

Precipitation (mm) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	72	55	56	71	—	48	25	57	121	151	202	88
Hiroshima	46	64	118	141	170	226	280	131	163	109	69	54
Difference	-26	+9	+62	+70	—	+179	+254	+74	+42	-42	-133	-34

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Portofino	72	55	56	71	—	48
Hiroshima	46	64	118	141	170	226
Difference	-26	+9	+62	+70	—	+179

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	25	57	121	151	202	88
Hiroshima	280	131	163	109	69	54
Difference	+254	+74	+42	-42	-133	-34

Cloud cover (%) Hiroshima runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	60	58	54	59	59	49	38	41	51	64	66	63
Hiroshima	81	79	73	68	68	79	75	67	72	68	72	78
Difference	+21	+21	+19	+9	+9	+30	+36	+26	+21	+5	+6	+15

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Portofino	60	58	54	59	59	49
Hiroshima	81	79	73	68	68	79
Difference	+21	+21	+19	+9	+9	+30

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	38	41	51	64	66	63
Hiroshima	75	67	72	68	72	78
Difference	+36	+26	+21	+5	+6	+15

Relative humidity (%) Hiroshima runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	85	81	78	77	76	72	65	66	70	80	84	85
Hiroshima	84	82	80	79	79	83	85	83	83	83	83	85
Difference	—	+1	+3	+1	+3	+11	+20	+17	+12	+3	-1	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Portofino	85	81	78	77	76	72
Hiroshima	84	82	80	79	79	83
Difference	—	+1	+3	+1	+3	+11

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Portofino	65	66	70	80	84	85
Hiroshima	85	83	83	83	83	85
Difference	+20	+17	+12	+3	-1	—

How both climates are changing

Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Portofino trends → · Hiroshima trends →

Methodology & sources

Portofino

Temperature & precipitation — the official 1991–2020 climate normals from the WMO's CLINO 1991–2020 collection, measured at Genova_sestri, about 32 km from the city centre.

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.

Hiroshima

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Hiroshima, about 1 km from the city centre.

How we build these numbers →

← change Portofino · change Hiroshima → · Portofino page · Hiroshima page