“outside” in Japanese is 外, read gai, soto, hoka (がい, そと, ほか). It is a Grade 2 Kyōiku kanji, taught in year 2 of Japanese elementary school, and appears in words such as 外国 (foreign country).
What does 外 mean?
外は さむいです。
Same sound, different character — the classic trap. Compare them side by side: