This is a whole different lifestyle than the US. Everything is very laid back and low key here. Iwakuni is the most populated section which is approximately 115,000.
The weather here reminds me of San Francisco. It stays pretty cool and with a good amount of rain each month. Typhoon season is from June-Nov. Typhoons cause for a lot of wind and rain and the base will usually shut down. Everything here is built to typhoon standards, so when a warning is issued, everyone goes home.
Sunday 04/19/2015 100%
Periods of heavy rain. Lows overnight in the low 60s.
Monday 04/20/2015 90%
Rain early...then remaining cloudy with showers in the afternoon. High 68F. Winds WSW at 5 to 10 mph. Chance of rain 90%. Rainfall around a quarter of an inch.
Tuesday 04/21/2015 0%
Mainly sunny. High 67F. Winds E at 5 to 10 mph.
What is there to do in Iwakuni Japan?
Ocean: The ocean in Iwakuni is truly spectacular. If you have a love for the water, this might just be the place for you. Iwakuni is a tropical environment and the water is the most beautiful shade of blue. It is a huge hotspot for snorkeling and scuba diving. You can get certified for scuba diving once you are here!
Aquarium: The second largest aquarium in the world is housed in Okinawa, Japan. It is located on the northern end of the island. It has the world’s largest single tank which houses 3 large whale sharks along with hundreds of other fish.
(image is from google)