Tokyo Weather in August
Planning a trip to Japan in August? Here's what the weather will really feel like in Tokyo — and why August needs more prep than any other month of the year.
August is Tokyo's hottest month, and the heat isn't the only story. Highs sit between 85–90°F, lows barely drop below the 70s, and the humidity makes it genuinely punishing. Heat advisories are common, locals carry sun umbrellas (not just for rain), and Pocari Sweat becomes your new best friend. You'll also see 8–10 rainy days, sudden "gorilla rain" thunderstorms that dump water fast, and the start of peak typhoon season.
Meteorologist Ian Schwartz breaks down what to expect so you can pack smart, plan your days around the heat, and know what to watch for.
At a glance
What's covered
- Highs, lows, and why the humidity changes everything
- Heat advisory and exhaustion risk
- What to drink, what to carry, what locals actually do
- "Gorilla rains" explained
- Typhoon season — what's likely and what to watch for
Jump to a moment
Tokyo, Japan in August FAQ
What is the weather like in Tokyo, Japan in August?
Tokyo's hottest, most demanding weather month.
- Highs: 85–90°F
- Lows: 72–78°F (barely drop below the 70s)
- Rain: 8–10 days, plus sudden "gorilla rain" thunderstorms
- Heat advisories common; peak typhoon season begins
How hot does Tokyo actually get in August?
Daily highs of 85–90°F are typical, with humidity that often pushes the heat index over 100°F. Nights barely cool off — lows in the mid-70s are normal. It's the kind of heat that requires real planning: hydration, breaks, and avoiding the worst hours.
What's a "gorilla rain"?
It's a Japanese term (gerira-gōu) for a sudden, intense downpour that comes out of nowhere and dumps a lot of water fast — often during summer afternoons. They're short but heavy enough to flood streets quickly. A compact umbrella in your bag is non-negotiable.