Osaka sits on Japan’s main island of Honshu at roughly the same latitude as Los Angeles, giving it a humid subtropical climate with four distinct seasons. Summers are hot and intensely humid, winters are cool but rarely freezing, and the city receives about 1,300mm of rain annually with a pronounced rainy season (tsuyu) in June and July.
Osaka Bay moderates coastal temperatures slightly, but the dense urban core of 2.7 million people creates a heat island effect that pushes summer temperatures higher than surrounding areas. This month-by-month guide uses 30-year averages from Osaka Meteorological Observatory to help you plan around the city’s seasonal extremes.
Osaka Weather by Month: Temperature, Rainfall, Humidity and Typhoon Table
| Month | Avg High °C (°F) | Avg Low °C (°F) | Rainfall (mm) | Rain Days | Humidity % | Sun Hours |
|---|---|---|---|---|---|---|
| January | 10 (50) | 2 (36) | 44 | 5 | 61 | 4 |
| February | 11 (52) | 2 (36) | 59 | 6 | 60 | 4 |
| March | 14 (57) | 5 (41) | 100 | 9 | 59 | 5 |
| April | 20 (68) | 10 (50) | 121 | 9 | 59 | 6 |
| May | 25 (77) | 15 (59) | 140 | 9 | 63 | 6 |
| June | 28 (82) | 20 (68) | 200 | 11 | 72 | 4 |
| July | 32 (90) | 24 (75) | 157 | 10 | 74 | 6 |
| August | 33 (91) | 25 (77) | 110 | 8 | 72 | 7 |
| September | 29 (84) | 21 (70) | 185 | 10 | 71 | 5 |
| October | 23 (73) | 15 (59) | 113 | 7 | 67 | 5 |
| November | 17 (63) | 9 (48) | 71 | 6 | 64 | 5 |
| December | 12 (54) | 4 (39) | 44 | 5 | 63 | 4 |
January Weather in Osaka: Cold, Clear, and Quiet
January is Osaka’s coldest month with daytime highs of 10°C (50°F) and overnight lows around 2°C (36°F). Rain is minimal at 44mm over just 5 days, making it the driest month alongside December. Humidity sits at a comfortable 61%. You’ll get 4 hours of daily sun. Snow is rare in central Osaka (once every few years) but visible on the surrounding mountains.
This is the quietest month for tourism. Hotel prices are at their lowest. Pack a warm coat, scarf, and gloves, but you won’t need heavy winter gear. The best time to visit Osaka for budget travelers is January or February.
February: Still Cold, Plum Blossoms Begin
February brings highs of 11°C (52°F) and lows of 2°C (36°F). Rain increases slightly to 59mm over 6 days. The plum blossoms (ume) begin blooming mid-month, particularly at Osaka Castle Park. This is still winter, with cold winds, but the days are noticeably longer than December. Pack similar to January. The Setsubun festival (February 3) at Osaka temples draws crowds for bean-throwing ceremonies.
March Weather in Osaka: Cherry Blossom Season Begins
March delivers highs of 14°C (57°F) and lows of 5°C (41°F). Rain jumps to 100mm over 9 days. The cherry blossoms (sakura) typically open around March 25-28 and reach full bloom around April 1-5, though dates vary by 1-2 weeks depending on temperature. This is one of Osaka’s most popular tourist periods.
Hotel prices spike during the bloom and sell out weeks ahead. The Osaka neighborhoods around Osaka Castle Park and Kema Sakuranomiya Park host the best hanami (blossom viewing). Pack layers including a warm jacket for evenings.
April: Cherry Blossoms, Mild Temperatures, and Crowds
April brings pleasant highs of 20°C (68°F) and lows of 10°C (50°F). Rain holds at 121mm over 9 days. The cherry blossoms dominate the first week, then the city settles into mild spring weather. This is an excellent month for Osaka sightseeing with comfortable walking temperatures. Golden Week (April 29-May 5) brings a domestic travel surge at month’s end. Pack light layers and a light jacket. Humidity stays low at 59%.
May Weather in Osaka: Warm Before the Rains
May delivers highs of 25°C (77°F) and lows of 15°C (59°F). Rain increases to 140mm over 9 days. The humidity starts creeping up (63%). Golden Week in early May creates domestic travel chaos with packed trains and elevated hotel prices. After Golden Week, the second half of May offers a sweet spot of warm weather, manageable humidity
reduced crowds before the rainy season. This is one of the best months for outdoor exploration of Osaka festivals.
June: Tsuyu (Rainy Season) Arrives
June is Osaka’s wettest month at 200mm over 11 days. Highs reach 28°C (82°F) with lows of 20°C (68°F). The tsuyu (plum rain) season typically starts around June 5-10 and continues into mid-July, bringing persistent grey skies, high humidity (72%), and only 4 hours of daily sun.
It doesn’t rain constantly, but it rains frequently, often as heavy downpours. The upside: this is the low season for tourism, and hotels are affordable. The hydrangeas (ajisai) bloom beautifully in this weather. Pack a good umbrella, waterproof shoes, and quick-drying clothing. Air conditioning becomes essential for comfort.
July in Osaka: Hot, Humid, and Festival Season
July temperatures hit 32°C (90°F) highs with warm 24°C (75°F) lows. Rain remains heavy at 157mm over 10 days as the rainy season tails off mid-month. Humidity peaks at 74%, creating heat index values that feel like 38°C (100°F). The Tenjin Matsuri (July 24-25), one of Japan’s top three festivals, fills the city with parades, boat processions, and fireworks.
This is challenging weather for sightseeing. Pack the lightest clothing possible, sun protection, and a small towel for the sweat that’s unavoidable. Stay hydrated and plan indoor activities for midday. See the Osaka weather guide for tips on managing summer conditions.
August: Peak Heat, Typhoon Risk, and Summer Festivals
August is Osaka’s hottest month at 33°C (91°F) highs and 25°C (77°F) lows. Rain drops to 110mm over 8 days, but humidity holds at 72%. This is the peak of the typhoon season (August-October), though direct hits are sporadic. The heat is oppressive and unrelenting, with overnight lows that never cool off.
On the plus side, you’ll get 7 hours of daily sun, the most of any month. Summer festivals (natsu matsuri) with fireworks displays occur throughout the month. Obon (mid-August) is a major domestic travel period. Pack the lightest clothing possible and expect to sweat constantly.
September: Typhoon Peak, Still Hot and Humid
September brings highs of 29°C (84°F) and lows of 21°C (70°F). Rain surges back to 185mm over 10 days, largely driven by typhoon-related rainfall. September is statistically the peak of typhoon season in Osaka. The humidity begins easing slightly but still sits at 71%.
The first half of the month feels like August; the second half brings gradual cooling. This is the low season for international tourism, making it a budget-friendly window if you’re willing to gamble on weather. The autumn foliage season hasn’t started yet. Pack rain gear and summer-weight clothing.
October Weather in Osaka: The Sweetest Month
October is arguably Osaka’s most pleasant month. Highs drop to 23°C (73°F) with lows of 15°C (59°F). Rain decreases to 113mm over 7 days. Humidity falls to 67%, and the oppressive summer humidity finally breaks. You’ll get 5 hours of daily sun. This is an ideal month for walking the city and exploring outdoor Osaka attractions. Hotel prices are moderate between the summer low season and the autumn foliage spike. Pack light layers. The typhoon risk decreases but doesn’t disappear entirely.
November: Autumn Foliage and Perfect Temperatures
November delivers highs of 17°C (63°F) and lows of 9°C (48°F). Rain drops to 71mm over 6 days. The autumn leaves (koyo) peak around mid-to-late November at Minoo Park (30 minutes north of Osaka) and in the castle grounds. This is the second-most popular tourist season after cherry blossom time. Hotel prices rise accordingly, especially on weekends. The weather is near-perfect for sightseeing: crisp, clear
dry. Pack a jacket and light layers. Check the best time to visit Osaka guide for navigating autumn crowds.
December: Cool, Clear, and Illuminated
December brings highs of 12°C (54°F) and lows of 4°C (39°F). Rain drops to 44mm over 5 days, matching January as the driest month. The city’s winter illuminations transform Midosuji Boulevard, Nakanoshima, and Osaka Castle into light displays from late November through December 31.
Hotel prices rise for Christmas week and New Year’s Eve but remain moderate for the first three weeks. New Year (Oshogatsu, December 31-January 3) is Japan’s most important holiday; many attractions and restaurants close, but the temple visits (hatsumode) offer a unique cultural experience. Pack a warm coat and layers.
Read Osaka travel tips and FAQ for practical logistics.