Hotels in Kosai

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Check prices for these dates

Tonight
May 11 - May 12
Tomorrow
May 12 - May 13
Next weekend
May 16 - May 18
In two weeks
May 23 - May 25

Where to stay in Kosai?

Hotel Route Inn Hamanako
Public bath

Hotel Route Inn Hamanako

3.0 star property
8.0 out of 10, Very Good, (173)
$81 nightly
The price is $89
Jun 1 - Jun 2
Hotel Route Inn Hamanako
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
trending_down

Our prices for hotels in Kosai are cheapest in March

See average prices and weather for all months

Price trends for hotels in Kosai

Pricing is based on two traveler single night rates
May
$51
Average price during May is $51
Jun
$62
Average price during June is $62
Jul
$64
Average price during July is $64
Aug
$75
Average price during August is $75
Sep
$67
Average price during September is $67
Oct
$74
Average price during October is $74
Nov
$68
Average price during November is $68
Dec
$88
Average price during December is $88
Jan
$63
Average price during January is $63
Feb
$54
Average price during February is $54
Mar
$49
Average price during March is $49
Apr
$57
Average price during April is $57
Currently viewing crowd sizes and weather for May.

May

trending_upHigh crowds
High 71°F / low 59°F. Partly sunny.
71°
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May, High crowds, average high temperature 71 degrees Fahrenheit, average low temperature 59 degrees Fahrenheit. Partly sunny.
59°
76°
weather_partly_sunny
June, Moderate crowds, average high temperature 76 degrees Fahrenheit, average low temperature 66 degrees Fahrenheit. Partly sunny.
66°
83°
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July, Moderate crowds, average high temperature 83 degrees Fahrenheit, average low temperature 74 degrees Fahrenheit. Rainy most days.
74°
86°
weather_partly_sunny
August, Moderate crowds, average high temperature 86 degrees Fahrenheit, average low temperature 76 degrees Fahrenheit. Partly sunny.
76°
80°
weather_partly_sunny
September, Moderate crowds, average high temperature 80 degrees Fahrenheit, average low temperature 71 degrees Fahrenheit. Partly sunny.
71°
72°
weather_partly_sunny
October, High crowds, average high temperature 72 degrees Fahrenheit, average low temperature 61 degrees Fahrenheit. Partly sunny.
61°
63°
weather_sun
November, Low crowds, average high temperature 63 degrees Fahrenheit, average low temperature 51 degrees Fahrenheit. Sunny most days.
51°
53°
weather_sun
December, Low crowds, average high temperature 53 degrees Fahrenheit, average low temperature 42 degrees Fahrenheit. Sunny most days.
42°
48°
weather_sun
January, High crowds, average high temperature 48 degrees Fahrenheit, average low temperature 37 degrees Fahrenheit. Sunny most days.
37°
50°
weather_sun
February, Low crowds, average high temperature 50 degrees Fahrenheit, average low temperature 38 degrees Fahrenheit. Sunny most days.
38°
57°
weather_sun
March, High crowds, average high temperature 57 degrees Fahrenheit, average low temperature 43 degrees Fahrenheit. Sunny most days.
43°
64°
weather_sun
April, Low crowds, average high temperature 64 degrees Fahrenheit, average low temperature 51 degrees Fahrenheit. Sunny most days.
51°
Monthly weather averages (˚F)
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Top landmarks in Kosai

Arai Benten Beach

Whether you want to hunt for sand dollars or smell the fresh air, Arai Benten Beach is a spot you might want to check out, located 5.1 mi (8.2 km) from central Kosai. Catch the sunset by the shore at Arai Beach, just a short walk away.

See properties in Arai Benten Beach
Arai Benten Beach

Learn more about Kosai

Kosai is well-known for its attractions such as Lake Hamana and Arai Beach.

See all hotels in Kosai
A tranquil hotel pool encircled by beautiful arches, enhancing the ambiance for leisure and relaxation.

Summer Getaway Sale

Save 25% or more on select hotels, and earn 50% more rewards on all properties. Book by May 26 and travel by Sep 30, 2025. See terms*
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Frequently asked questions

What accommodations do travelers recommend in Kosai?
Hotel Route Inn Hamanako and Tabist Kosai Hamanako no Yado are a couple of properties that our guests really like.
Where can I find free parking with my stay in Kosai?
These hotels offer the perk of free parking: Kuretake Inn Hamanako, Hotel Route Inn Hamanako and Hotel Nanvan Hamanako. There are 6 choices you may want to check out on our site.
Can I book refundable hotels in Kosai?
If you need the flexibility to change your travel plans to Kosai, most properties offer refundable* rates you can book. You can see these accommodations by searching our site and using the “fully refundable” filter to narrow down the results.
Where should I consider staying in Kosai if I want a budget-friendly accommodation?
Boyoso and Asashio are two accommodations you might want to consider that’ll save you money.
Where can I stay in Kosai if I want a vacation rental instead of a traditional hotel?
If you want to find a good alternative to a hotel, look over our selection of 7 vacation homes.
Where can I stay if I'm traveling to Kosai for a family-friendly trip?
Parents traveling with children may want to consider Family Lodge Hatagoya Hamanako, Tabist Kosai Hamanako no Yado and Hotel Route Inn Hamanako.
What will the weather in Kosai be like during my visit?
August and July are typically the warmest months in Kosai when the average temp is 76°F. January and February are the coldest months when the average temperature is 46°F. July and June are the months with the most rain.
Why should I book my Kosai accommodation with Hotels.com?
There are lots of reasons to book your Kosai trip with us: our free cancellations on selected hotels* gives you flexibility, and with One Key™, our rewards program, you will be able to earn and use OneKeyCash™** on all eligible bookings such as hotels, car rentals, flights, vacation rentals and more on Hotels.com, Expedia and Vrbo.

Terms and conditions

*Book by 5/26/2025 11:59 pm in hotel property local time. Stay between 4/17/2025-9/30/2025. Member Prices are available to Hotels.com® app users and One Key members. Limited availability, blackout periods may apply.

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