A consolidated reference for Hiroshima climate: monthly averages, rebuilt from public data on a schedule. Expect 1.8 C at the coldest (Jan) and 25.4 C at the warmest (Aug) — a 23.6 C spread. Expect a wet month and a dry month but no real season: 8.38 mm/day in Jul against 2.03 mm/day in Jan. Taken together that is roughly 1,552 mm of rain a year for the grid cell. The same build that regenerates the sitemap refreshes these values, and unchanged pages are left untouched. Use the table for exact numbers, or the related pages below for neighbouring locations and periods.
Annual mean temperature 13.4 C
Warmest month Aug (25.4 C)
Coldest month Jan (1.8 C)
Wettest month Jul (8.38 mm/day)
All-time record high 35.0 C
All-time record low -7.4 C
Annual precipitation 1,555 mm / year
Coordinates 34.4, 132.45
Population 1,200,754
Average monthly temperature and rainfall in Hiroshima
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
1.8
2.03
17.0
-7.4
Feb
3.0
2.65
18.6
-6.8
Mar
6.2
3.51
21.1
-4.5
Apr
11.4
4.17
25.3
-2.9
May
16.5
4.72
31.3
2.3
Jun
20.7
7.03
32.9
8.4
Jul
24.5
8.38
33.7
13.9
Aug
25.4
3.95
35.0
14.5
Sep
21.5
5.65
34.7
7.7
Oct
15.5
3.64
28.7
2.4
Nov
9.6
2.62
23.1
-3.1
Dec
4.0
2.71
21.1
-5.8
What the Hiroshima climate table shows
Values are multi-decadal climatological averages for the 34.4, 132.45 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 8.38 mm/day in a month?
Rain is recorded as a daily mean, so 8.38 mm/day is roughly 255 mm across a 30-day month.