Middle of the wetter season · Weather & things to do
Oahu in January
Little changes in Oahu from December: highs stay near 75°F (24°C), lows near 70°F (21°C), and about 2.8 in (71 mm) of rain falls.
January opens the best stretch on our comfort score, at 87/100 (6th of 12).
- Avg high
- 75°F (24°C)
- Avg low
- 70°F (21°C)
- Rain
- 2.8 in (71 mm)
- Humidity
- 75%
- Cloud cover
- 48%
- Daylight
- ~10 h 50 min
- Comfort score
- 87/100 · Great
What January feels like
Highs settle around 75°F (24°C), warm enough for short sleeves.
After dark, temperatures fall to about 70°F (21°C).
Humidity averages 75%, so the air feels sticky and the heat feels stronger than the thermometer says.
Showers are part of the month, adding up to about 2.8 in (71 mm).
Plan around January
January is one of Oahu's best months on the climate data.
- Opens the best-scoring stretch on our comfort score: January and May – September.
- Last of the best-scoring months: by February, the score drops to 83/100.
- Comfort improves from 82/100 in December to 87/100.
- Our Hawaii Paradise route recommends Apr – Oct, so January falls outside its suggested window.
What to pack for January
- Light, breathable clothes75°F afternoons
- Quick-dry fabrics75% average humidity
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Oahu in January
January is good outdoor weather here, so these picks lean toward the open air.
Diamond Head State Monument
Steep 1.6-mile round-trip trail up a volcanic crater rim with views over Waikiki.
Why now January scores 87/100 for comfort, good conditions for being outside.
Waikiki Beach
Calm, sandy swim and beginner surf with Diamond Head as the backdrop.
Why now Highs near 75°F and 2.8 in of monthly rain make this an easy outdoor pick.
Hanauma Bay Nature Preserve
Protected volcanic bay with reef snorkeling and green sea turtles.
Why now One to do outside while the weather is on your side.
Pearl Harbor National Memorial
Boat out to the USS Arizona Memorial and walk the museums on the 1941 attack.
Giovanni's Shrimp Truck
Graffiti-covered Kahuku truck serving garlic shrimp plates with rice.
Nearby in January
- Waikiki in January~15 mi · highs 77°F, 2.8 in rain · 1°C (2°F) warmer by day, about as wet
- Kailua & Lanikai in January~18 mi · highs 76°F, 2.2 in rain · similar daytime temperatures, drier
- Maui in January~116 mi · highs 68°F, 2.4 in rain · 4°C (7°F) cooler by day, about as wet
- Big Island in January~200 mi · highs 50°F, 5.8 in rain · 14°C (25°F) cooler by day, wetter
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Oahu in January: quick answers
Is January a good time to visit Oahu?
Yes. On the climate data it's one of the best months, scoring 87/100. Expect highs of 75°F (24°C) and 2.8 in (71 mm) of rain. Our Hawaii Paradise route recommends Apr – Oct, so January is outside its suggested window.
How hot is Oahu in January?
Average highs are 75°F (24°C) and average lows 70°F (21°C), making it the 3rd-coldest month by daytime highs.
Does it rain a lot in Oahu in January?
Some: about 2.8 in (71 mm) of rain falls across January on average, the 6th-wettest month of the year. The annual total is about 30.4 in (771 mm).
What should I pack for Oahu in January?
Bring light, breathable clothes (75°F afternoons), quick-dry fabrics (75% average humidity), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Planning Oahu in January?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.