Hiroshima

🌧️

Rainfall and Typhoons

Sections

1. Rainfall Patterns in Hiroshima

Hiroshima experiences a relatively high amount of rainfall throughout the year, with distinct peaks during the rainy season and typhoon season. Here’s a breakdown:

Rainy Season (Tsuyu)

  • Timing: The rainy season typically occurs from mid-June to mid-July.
  • Characteristics:
    • Prolonged periods of rain, often light to moderate, but occasionally heavy.
    • High humidity levels, making the air feel sticky and warm.
    • Temperatures range from 22°C to 30°C (72°F to 86°F).
  • Impact:
    • Outdoor activities may be disrupted due to wet conditions.
    • Rivers and streams may swell, and some hiking trails or rural areas may become muddy or inaccessible.

General Rainfall Throughout the Year

  • Hiroshima receives an average annual rainfall of about 1,500 mm (59 inches).
  • Rainfall is more frequent in the warmer months (May to September), while winters (December to February) are relatively dry.
  • Autumn (October-November): Occasional rain showers, but generally pleasant weather.

2. Typhoon Season in Hiroshima

Hiroshima is affected by Japan’s typhoon season, which runs from June to October, with the peak months being August and September.

Characteristics of Typhoons in Hiroshima:

  • Typhoons bring strong winds, heavy rain, and potential flooding.
  • Hiroshima is located on the Seto Inland Sea, which somewhat shields it from the full brunt of typhoons compared to coastal areas like Okinawa or Kyushu. However, the city can still experience significant impacts, including:
    • Disruptions to transportation (trains, flights, ferries).
    • Temporary closures of tourist sites.
    • Power outages in severe cases.

Precautions During Typhoon Season:

  1. Monitor Weather Updates:
    • Use reliable sources like the Japan Meteorological Agency (JMA) or weather apps (e.g., Yahoo Weather Japan, Tenki.jp).
    • Pay attention to typhoon warnings and advisories.
  2. Prepare Emergency Supplies:
    • Stock up on essentials like bottled water, non-perishable food, flashlights, and batteries.
    • Keep a portable phone charger and important documents in a waterproof bag.
  3. Stay Indoors:
    • Avoid going outside during a typhoon, as strong winds can cause flying debris.
    • If you’re in a low-lying area, be aware of potential flooding and have an evacuation plan.
  4. Transportation:
    • Check for cancellations or delays in public transport, especially for trains (Shinkansen) and flights.
    • Avoid driving during heavy rain or strong winds.

3. Seasonal Weather Patterns and Their Impact on Activities

Hiroshima’s weather and rainfall patterns can influence your plans, whether you’re visiting or living in the city. Here’s how:

Spring (March-May):

  • Weather: Mild temperatures (10°C to 20°C / 50°F to 68°F) with occasional rain.
  • Activities: Ideal for visiting Hiroshima Peace Memorial Park, Miyajima Island, and cherry blossom viewing in late March to early April.
  • Precautions: Carry a light rain jacket or umbrella for occasional showers.

Summer (June-August):

  • Weather: Hot and humid (25°C to 35°C / 77°F to 95°F) with heavy rainfall during the rainy and typhoon seasons.
  • Activities:
    • Visit indoor attractions like the Hiroshima Peace Memorial Museum or Hiroshima Castle during rainy days.
    • Outdoor activities like hiking on Mt. Misen or exploring Shukkeien Garden may be challenging due to heat and rain.
  • Precautions:
    • Wear breathable clothing and stay hydrated.
    • Always carry an umbrella or raincoat.
    • Check weather forecasts for typhoon warnings.

Autumn (September-November):

  • Weather: Cooler temperatures (15°C to 25°C / 59°F to 77°F) with occasional typhoons in early autumn.
  • Activities:
    • Enjoy autumn foliage at Mitaki-dera Temple or Hijiyama Park.
    • Attend local festivals like the Hiroshima Food Festival in late October.
  • Precautions: Be cautious of typhoons in September and early October.

Winter (December-February):

  • Weather: Cold but relatively dry (0°C to 10°C / 32°F to 50°F).
  • Activities:
    • Explore Hiroshima’s historical sites without the crowds.
    • Visit Onomichi or take a ferry to Miyajima for serene winter landscapes.
  • Precautions: Minimal rainfall, but dress warmly for outdoor activities.

4. Costs and Preparations for Rainy and Typhoon Seasons

Typical Costs:

  1. Rain Gear:
    • Umbrella: ¥500-¥2,000 (available at convenience stores or department stores).
    • Raincoat: ¥1,000-¥3,000.
  2. Emergency Supplies:
    • Bottled water: ¥100-¥150 per liter.
    • Non-perishable food: ¥500-¥1,000 for a few days’ supply.
    • Flashlight: ¥1,000-¥3,000.
  3. Transportation Adjustments:
    • If trains or buses are delayed, taxis may cost ¥1,000-¥3,000 for short distances.

Practical Preparations:

  • Clothing: Pack waterproof shoes, quick-dry clothing, and a sturdy umbrella.
  • Home Preparations (for residents):
    • Ensure windows and doors are secure during typhoons.
    • Clear balconies of loose items that could become projectiles in strong winds.

5. How Weather Affects Local Sites and Activities

  1. Miyajima Island:
    • Accessible by ferry, which may be suspended during typhoons or heavy rain.
    • Hiking trails on Mt. Misen can become slippery after rain.
  2. Hiroshima Peace Memorial Park:
    • Open year-round, but bring an umbrella during rainy days.
  3. Shukkeien Garden:
    • Beautiful after rain, but pathways may be muddy.
  4. Hiking and Outdoor Activities:
    • Trails like those on Mt. Futaba or Mt. Misen may close temporarily during heavy rain or typhoons.

6. Cultural Considerations

  • Umbrella Etiquette: In Japan, it’s common to use umbrella stands outside shops and restaurants. Avoid bringing a wet umbrella indoors.
  • Seasonal Foods: During the rainy season, enjoy local specialties like anago (conger eel) or momiji manju (maple-leaf-shaped cakes), which pair well with the cozy indoor atmosphere.

Conclusion

Hiroshima’s weather, particularly its rainfall and typhoon patterns, requires some preparation, but it doesn’t have to hinder your experience. By staying informed, packing appropriately, and planning activities around the weather, you can enjoy everything this historic and culturally rich city has to offer. Whether you’re visiting for a short time or settling in as a resident, adapting to Hiroshima’s climate will ensure a safe and enjoyable experience.