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Weather in Hiroshima - 14-day forecast

Detailed weather forecast for Hiroshima, Japan: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Hiroshima
today🌧️ 28°💧 0.1 mm
Sun☁️ 30°💧 11.1 mm
Mon🌤️ 30°💧 4.9 mm
Tue☀️ 31°💧 0.2 mm
Wed🌧️ 24°💧 9.8 mm
Thu🌧️ 23°💧 37.1 mm
Fri🌤️ 27°💧 1.7 mm
Sat🌧️ 24°💧 0.5 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Thursday 10 Sept in Hiroshima, the forecast high is 23°C. Typical daytime temperatures at this time of year range from 25°C to 29°C, so it will be exceptionally cool. It is cooler than 95% of similar days.

28°Cnear normal
usually 26°C–30°C
night: exceptionally warm rain: typical rainfall wind: typical
30°Cwarmer than usual
usually 26°C–30°C
warmer than 82% of similar days
night: exceptionally warm rain: more rain than usual wind: stronger than usual
30°Cwarmer than usual
usually 26°C–30°C
warmer than 86% of similar days
night: warmer than usual rain: more rain than usual wind: exceptionally strong
31°Cexceptionally warm
usually 25°C–30°C
warmer than 91% of similar days
night: exceptionally warm rain: typical rainfall wind: lighter than usual
24°Cexceptionally cool
usually 25°C–29°C
cooler than 92% of similar days
night: warmer than usual rain: more rain than usual wind: typical
23°Cexceptionally cool
usually 25°C–29°C
cooler than 95% of similar days
night: warmer than usual rain: exceptionally wet wind: typical
27°Cnear normal
usually 25°C–29°C
night: exceptionally warm rain: typical rainfall wind: lighter than usual

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
20°28°35° 1981: 24°C1982: 26°C1983: 29°C1984: 27°C1985: 31°C1986: 29°C1987: 28°C1988: 27°C1989: 27°C1990: 32°C1991: 28°C1992: 29°C1993: 24°C1994: 30°C1995: 27°C1996: 26°C1997: 26°C1998: 29°C1999: 28°C2000: 29°C2001: 27°C2002: 31°C2003: 29°C2004: 25°C2005: 27°C2006: 26°C2007: 29°C2008: 30°C2009: 27°C2010: 31°C2011: 27°C2012: 29°C2013: 27°C2014: 27°C2015: 24°C2016: 28°C2017: 27°C2018: 25°C2019: 30°C2020: 28°C2021: 27°C2022: 29°C2023: 28°C2024: 31°C2025: 30°C 2026 forecast: 28°C current forecast 28°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 28°C by day. The coolest year was 1993 (24°C) and the warmest was 1990 (32°C). The current forecast averages 28°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Hiroshima

Hiroshima - 14-day weather forecast infographic

Hiroshima 30 & 45-day weather - long-range outlook

Next 16 days · forecast
27°
around 23° at night · days with rain: 11
Weeks 3-4 · avg for September
27°
around 21° at night · rain chance 46%
Weeks 5-7 · avg for October
23°
around 16° at night · rain chance 31%
The 30 & 45-day outlook for Hiroshima: the next 16 days are a numerical forecast updated daily - on average 27° by day and 23° at night. Further out we rely on multi-year climate averages: around 27° in September, and about 23° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Hiroshima

Saturday5 September 2026
🌧️28°light rain
sunrise 05:46 · sunset 18:32 · night 23° · evening 26° · rain 0.1 mm · humidity 60% · wind 5 m/s · clouds 100%
Sunday6 September 2026
☁️30°overcast clouds
sunrise 05:46 · sunset 18:31 · night 25° · evening 26° · rain 11.1 mm · humidity 62% · wind 6 m/s · clouds 98%
Monday7 September 2026
🌤️30°a few clouds
sunrise 05:47 · sunset 18:29 · night 22° · evening 25° · rain 4.86 mm · humidity 57% · wind 7 m/s · clouds 15%
Tuesday8 September 2026
☀️31°clear sky
sunrise 05:48 · sunset 18:28 · night 25° · evening 27° · rain 0.21 mm · humidity 50% · wind 3 m/s · clouds 34%
Wednesday9 September 2026
🌧️24°moderate rain
sunrise 05:48 · sunset 18:26 · night 22° · evening 22° · rain 9.81 mm · humidity 93% · wind 3 m/s · clouds 100%
Thursday10 September 2026
🌧️23°heavy rain
sunrise 05:49 · sunset 18:25 · night 21° · evening 24° · rain 37.05 mm · humidity 84% · wind 5 m/s · clouds 99%
Friday11 September 2026
🌤️27°scattered clouds
sunrise 05:50 · sunset 18:24 · night 23° · evening 25° · rain 1.65 mm · humidity 59% · wind 3 m/s · clouds 50%
Saturday12 September 2026
🌧️24°light rain
sunrise 05:51 · sunset 18:22 · night 23° · evening 25° · rain 0.51 mm · humidity 80% · wind 2 m/s · clouds 100%
Sunday13 September 2026
☁️29°broken clouds
sunrise 05:51 · sunset 18:21 · night 25° · evening 25° · rain 0.24 mm · humidity 63% · wind 2 m/s · clouds 68%
Monday14 September 2026
🌧️30°light rain
sunrise 05:52 · sunset 18:19 · night 25° · evening 26° · rain 1.89 mm · humidity 64% · wind 3 m/s · clouds 38%
Tuesday15 September 2026
🌧️28°moderate rain
sunrise 05:53 · sunset 18:18 · night 24° · evening 25° · rain 15.3 mm · humidity 75% · wind 2 m/s · clouds 82%
Wednesday16 September 2026
🌧️24°moderate rain
sunrise 05:53 · sunset 18:17 · night 23° · evening 24° · rain 9 mm · humidity 94% · wind 2 m/s · clouds 100%
Thursday17 September 2026
☀️29°clear sky
sunrise 05:54 · sunset 18:15 · night 21° · evening 24° · rain 3.15 mm · humidity 49% · wind 3 m/s · clouds 90%
Friday18 September 2026
☀️28°clear sky
sunrise 05:55 · sunset 18:14 · night 21° · evening 23° · rain 1.47 mm · humidity 48% · wind 3 m/s · clouds 8%
Saturday19 September 2026
🌧️27°light rain
sunrise 05:55 · sunset 18:12 · night 22° · evening 23° · rain 0.99 mm · humidity 63% · wind 3 m/s · clouds 85%
Sunday20 September 2026
🌧️26°light rain
sunrise 05:56 · sunset 18:11 · night 22° · evening 23° · rain 1.35 mm · humidity 66% · wind 3 m/s · clouds 98%

UV index in Hiroshima - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTHiroshima03681111+7.3UV HIGHtoday, daily maxSPF 30-50, a hat and sunglasses are a must. Betterstay in shade between 11:00 and 15:00.Unprotected fair skin may burn in about 25 min7Sat5.095Sun6.097Mon7.097Tue8.097Wed9.096Thu10.091Fri11.091Sat12.095Sun13.097Mon14.096Tue15.095Wed16.096Thu17.097Fri18.097Sat19.097Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Hiroshima is 7 (high) - unprotected fair skin can burn in about 25 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.

Sea temperature - Hiroshima

Water today
28°C
Week avg
28°C
Waves today
0.3 m
How's the water?
very warm
16-day sea temperature forecast:
5.09 28°C6.09 28°C7.09 28°C8.09 28°C9.09 28°C10.09 27°C11.09 27°C12.09 28°C13.09 28°C
Average sea temperature through the year:
Jan 12°CFeb 10°CMar 11°CApr 15°CMay 19°CJun 22°CJul 27°CAug 30°CSep 29°COct 24°CNov 20°CDec 15°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Hiroshima weather through the year

Hiroshima - annual climate

Warmest, driest months on average: April, May, June, September.

Upcoming public holidays in Japan: Respect for the Aged Day — 21 September · Citizen's Holiday — 22 September · Autumnal Equinox Day — 23 September. Full calendar and travel notes

Nearby and related places

FukuokaOsakaKyotoNagoyaYokohamaNikkōTokyo

FAQ - Hiroshima weather

What is the weather like in Hiroshima today?
Today it is about 28° during the day and 23° at night, light rain.
How far ahead can I check the forecast for Hiroshima?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.