Best time to visit Oahu
Re-score for me — drag the dial — every chart recolours live for your heat & sea limits 27°C · sea 29°C
Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.
Default 29 °C is the Beach Climate Index "bathtub" line (Morgan et al.) — where the sea stops being refreshing and starts feeling like a warm bath.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
Greyed factors are scored normally — extreme heat overrides them, so a clear sky or low rain can't lift the period.
How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.
Compare with another destination
Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.
Tours in Oahu
30 top-rated tours via Viator. Booking links earn this site a commission at no cost to you.
- 1
Pearl Harbor Tribute: Arizona Memorial and Honolulu City Tour - 2
Deluxe Arizona Memorial and USS Missouri Battleship Tour - 3
Toa Luau at Waimea Valley, Oahu - 4
Surfing Lessons in Waikiki with Hawaii Firefighters - 5
Oʻahu Private Helicopter Experience: All Window Seats - 6
Deluxe Pearl Harbor, Arizona Memorial, and Visitor Center Tour - 7
Voted Honolulu's #1 Beginner Scuba Diving + Free Videos Tour - 8
Waikiki Turtle Canyon Guided Snorkel: Turtle Guarantee - 9
Waikiki Turtle Canyon Snorkel Turtles Guaranteed - 10
Waikiki: Turtle Canyon Snorkel Adventure on Oahu - 11
Waikiki Coral Reef Snorkel & Waterslide Adventure - 12
Family, Private & Group Surf Lessons w/ Waikiki Courtesy Shuttle - 13
Oahu: Roundtrip Shuttle From Waikiki to Dole Plantation & Haleiwa - 14
Oahu's Circle Island Tour Operated By Fil-Am Travel & Tours - 15
Oahu: Atlantis Submarine Adventure in Waikiki - 16
Oahu: Chief's Luau Admission Including Transfers - 17
Waikiki Sunset Cocktail Cruise aboard the Majestic by Atlantis - 18
Educational Shark tour from Haleiwa - Sharks Guaranteed - 19
Honolulu Airport, Cruise Port and Hotel Private Transfer(1-10pax) - 20
Dive with Sharks in Hawaii: Shark Tour from Haleiwa - 21
Private Pearl Harbor and Honolulu City Tour - 22
Kailua Bay, Oahu: Epic Kayak and Snorkel to Islands - 23
Oahu: Chief's Luau Admission - 24
Kualoa Ranch UTV Raptor Tour in Oahu - 25
Oahu Day Tour with Waterfalls Food Trucks and Lookout Points - 26
Oahu: Full or Half Day Grand Circle Island Tour - 27
Oahu Majestic Circle Island Tour with Waimea Falls and Byodo Inn - 28
Oahu: The Magical Mystery Show! at Hilton Waikiki Beach Hotel - 29
Oahu Shark Dive on the North Shore - 30
Parasailing Experience in Waikiki, HI
Last refreshed 2026-10-24.
Similar climatesHonolulu91% · San Juan86% · Marsh Harbour84%
Other destinations with the most-alike year-round climate to Oahu (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Oahu's. Based on the 2020-2024 climatology, not this year's actual weather.
Month-by-month
| Month | Temp °C | Feels °C | Rain days | Rain h | Rain h/day | Humidity | Wind km/h | Sun h | UV | Interest | Score |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 19–26 | 26 | 11 | 175 | 15.9 | 64% | 19 | 225 | 6 | Moderate | 7 |
| Feb | 19–25 | 25 | 12 | 159 | 13.3 | 61% | 22 | 220 | 7 | Moderate | 7 |
| Mar | 19–25 | 26 | 19 | 251 | 13.2 | 63% | 21 | 239 | 9 | Busy | 5 |
| Apr | 20–26 | 26 | 16 | 208 | 13.0 | 61% | 21 | 255 | 10 | Moderate | 6 |
| May | 20–27 | 28 | 14 | 186 | 13.3 | 60% | 21 | 280 | 10 | Moderate | 6 |
| Jun | 21–28 | 29 | 8 | 152 | 19.0 | 58% | 22 | 288 | 11 | Busy | 7 |
| Jul | 22–28 | 29 | 11 | 192 | 17.5 | 59% | 24 | 294 | 11 | Peak | 6 |
| Aug | 22–29 | 30 | 9 | 137 | 15.2 | 56% | 22 | 288 | 11 | Peak | 7 |
| Sep | 22–29 | 30 | 9 | 134 | 14.9 | 57% | 21 | 261 | 10 | Quiet | 6 |
| Oct | 21–29 | 30 | 14 | 164 | 11.7 | 59% | 19 | 247 | 8 | Quiet | 6 |
| Nov | 21–27 | 28 | 12 | 162 | 13.5 | 62% | 21 | 228 | 6 | Quiet | 7 |
| Dec | 19–26 | 27 | 10 | 171 | 17.1 | 64% | 20 | 226 | 5 | Moderate | 7 |
UV Index in Oahu by Month
UV index in Oahu peaks at 11 (extreme) in August, dropping to 5 (moderate) in December. March, April, May, June, July, August, September, October reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.
Best months in detail
February
7/1019–25°C · 12 rain days (159h) · 220 sun hours · 61% humidity · Moderate crowd · UV 7 (high) · sunniest 1 in 10 days reach 9 (very high)
June
7/1021–28°C · 8 rain days (152h) · 288 sun hours · 58% humidity · Busy crowd · UV 11 (very high) · sunniest 1 in 10 days reach 12 (extreme)
November
7/1021–27°C · 12 rain days (162h) · 228 sun hours · 62% humidity · Quiet crowd · UV 6 (high)
Every month
Show the other 9 months in detail
January
7/1019–26°C · 11 rain days (175h) · 225 sun hours · 64% humidity · Moderate crowd · UV 6 (moderate) · sunniest 1 in 10 days reach 7 (high)
March
5/1019–25°C · 19 rain days (251h) · 239 sun hours · 63% humidity · Busy crowd · UV 9 (very high) · sunniest 1 in 10 days reach 11 (very high)
April
6/1020–26°C · 16 rain days (208h) · 255 sun hours · 61% humidity · Moderate crowd · UV 10 (very high)
May
6/1020–27°C · 14 rain days (186h) · 280 sun hours · 60% humidity · Moderate crowd · UV 10 (very high) · sunniest 1 in 10 days reach 11 (extreme)
July
6/1022–28°C · 11 rain days (192h) · 294 sun hours · 59% humidity · Peak crowd · UV 11 (extreme)
August
7/1022–29°C · 9 rain days (137h) · 288 sun hours · 56% humidity · Peak crowd · UV 11 (extreme)
September
6/1022–29°C (feels 30°C) · 9 rain days (134h) · 261 sun hours · 57% humidity · Quiet crowd · UV 10 (very high) · sunniest 1 in 10 days reach 12 (extreme)
October
6/1021–29°C (feels 30°C) · 14 rain days (164h) · 247 sun hours · 59% humidity · Quiet crowd · UV 8 (very high)
December
7/1019–26°C · 10 rain days (171h) · 226 sun hours · 64% humidity · Moderate crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)
Frequently asked questions about visiting Oahu
When is the best time to visit Oahu?
February is the highest-scoring month (7/10 on the Holiday Climate Index). Typical conditions: 19–25°C (12 rainy days). The top three months by score are February, June, November.
What is the worst time to visit Oahu?
March is the lowest-scoring month (5/10). Typical conditions: 19–25°C (19 rainy days).
Is Oahu too hot in summer?
3 months (August, September, October) trip the heat deal-breaker in our scoring: apparent temperature crosses the comfort cap, so even with clear skies and low rain the score is held down. Plan around it if heat tolerance is low.
When are crowds lowest in Oahu?
Search-interest seasonality (Google Trends 2021-2025) is lowest in October and peaks in July. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.
Which months in Oahu have good weather but fewer tourists?
November (climate 7/10, crowd index 1) and September (climate 6/10, crowd index 14) — shoulder months with above-average climate and below-median search-interest. Often the best value-for-weather trade.
What is the UV index in Oahu by month?
UV peaks at 11 (extreme) in August and is lowest in December at 5 (moderate). Monthly peak values: Jan 6, Feb 7, Mar 9, Apr 10, May 10, Jun 11, Jul 11, Aug 11, Sep 10, Oct 8, Nov 6, Dec 5. March, April, May, June, July, August, September, October reach very high or extreme levels — apply SPF 50+, wear a hat and protective clothing, and limit direct sun between 11:00 and 17:00.
What is the UV index in Oahu in August?
August is the peak UV month in Oahu, with a daily-peak UV index of 11 (extreme). At this level, sunburn can occur in under 20 minutes on unprotected fair skin. Apply SPF 50+, wear protective clothing and a hat, and avoid direct midday sun (11:00–17:00).
How high can UV get in Oahu on the sunniest days?
Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. June is the worst case: typical days average UV 11 (very high), but the top 10% of days reach UV 12 (extreme) — and even higher. Months where the sunniest days routinely exceed the typical reading: January, February, March, May, June, September, December. Plan sun protection for the worst case, not the average.