Best time to visit Haleakalā
Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°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.
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 Haleakalā
21 top-rated tours via Viator. Booking links earn this site a commission at no cost to you.
- 1
Maui: Haleakala Sunrise Spectacular with Local Breakfast - 2
Private Stand Up Paddle Boarding Tour in Turtle Town, Maui - 3
Maui: Majestic Haleakala Sunrise Tour with Pick-up - 4
Haleakala Sunrise Best Self-Guided Bike Tour - 5
Haleakala Sunrise Best Guided Bike Tour with Bike Maui - 6
Private Haleakala Summit & Stroll from Kahului - 7
Complete Island 60-Minute Helicopter Tour - 8
Haleakala Classic Vehicle Sunrise Tour with Breakfast - 9
Haleakala Summit Best Self-Guided Bike Tour with Bike Maui - 10
Haleakala Crater Hiking Experience - 11
Best of Maui Tour: Sips, Sites and Bites with Lunch - 12
Road to Hana Halfway and Haleakala National Park - 13
Shore Excursion: Haleakala Sunrise Tour for Pride of America Passengers - 14
Haleakala Volcano Slingshot Tour from Lahaina - 15
Self-Guided Audio Driving Tour in Maui - 16
Day Trip Oahu to Maui: Sips, Sites and Bites - 17
Haleakala's Best Sunset Tour with Dinner - 18
Haleakala Private Sunset Tours - 19
Road to Hana and Haleakala Sunset Open-Air Jeep Private Tour - 20
Haleakala Sunset Experience - 21
Maui Haleakala Volcano Summit Slingshot Tour from Kihei
Last refreshed 2026-08-13.
Similar climatesPonta Delgada68% · Machu Picchu67% · Acatenango66%
Other destinations with the most-alike year-round climate to Haleakalā (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 Haleakalā'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 | 1–7 | 5 | 19 | 273 | 14.4 | 77% | 8 | 232 | 6 | Quiet | 2 |
| Feb | 0–6 | 3 | 21 | 309 | 14.7 | 76% | 8 | 217 | 7 | Quiet | 2 |
| Mar | 1–7 | 5 | 27 | 396 | 14.7 | 78% | 8 | 238 | 8 | Quiet | 1 |
| Apr | 1–7 | 5 | 25 | 349 | 14.0 | 78% | 8 | 251 | 9 | Quiet | 1 |
| May | 2–8 | 6 | 26 | 352 | 13.5 | 78% | 8 | 277 | 9 | Quiet | 2 |
| Jun | 2–9 | 7 | 19 | 270 | 14.2 | 73% | 7 | 287 | 10 | Quiet | 3 |
| Jul | 3–10 | 9 | 17 | 237 | 13.9 | 72% | 7 | 295 | 11 | Quiet | 4 |
| Aug | 3–10 | 8 | 23 | 302 | 13.1 | 74% | 7 | 288 | 11 | Busy | 2 |
| Sep | 3–10 | 8 | 23 | 298 | 13.0 | 75% | 7 | 260 | 10 | Quiet | 2 |
| Oct | 3–10 | 8 | 24 | 334 | 13.9 | 78% | 8 | 251 | 8 | Moderate | 2 |
| Nov | 2–8 | 6 | 20 | 277 | 13.8 | 78% | 7 | 221 | 6 | Moderate | 2 |
| Dec | 1–7 | 5 | 21 | 280 | 13.3 | 79% | 8 | 227 | 5 | Peak | 2 |
UV Index in Haleakalā by Month
UV index in Haleakalā peaks at 11 (very high) in July, 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
July
4/103–10°C (feels 9°C) · 17 rain days (237h) · 295 sun hours · 72% humidity · Quiet crowd · UV 11 (very high) · sunniest 1 in 10 days reach 12 (extreme)
June
3/102–9°C (feels 7°C) · 19 rain days (270h) · 287 sun hours · 73% humidity · Quiet crowd · UV 10 (very high) · sunniest 1 in 10 days reach 11 (extreme)
November
2/102–8°C (feels 6°C) · 20 rain days (277h) · 221 sun hours · 78% humidity · Moderate crowd · UV 6 (high)
Every month
Show the other 9 months in detail
January
2/101–7°C (feels 5°C) · 19 rain days (273h) · 232 sun hours · 77% humidity · Quiet crowd · UV 6 (moderate) · sunniest 1 in 10 days reach 7 (high)
February
2/100–6°C (feels 3°C) · 21 rain days (309h) · 217 sun hours · 76% humidity · Quiet crowd · UV 7 (high) · sunniest 1 in 10 days reach 8 (very high)
March
1/101–7°C (feels 5°C) · 27 rain days (396h) · 238 sun hours · 78% humidity · Quiet crowd · UV 8 (very high) · sunniest 1 in 10 days reach 10 (very high)
April
1/101–7°C (feels 5°C) · 25 rain days (349h) · 251 sun hours · 78% humidity · Quiet crowd · UV 9 (very high)
May
2/102–8°C (feels 6°C) · 26 rain days (352h) · 277 sun hours · 78% humidity · Quiet crowd · UV 9 (very high) · sunniest 1 in 10 days reach 11 (very high)
August
2/103–10°C (feels 8°C) · 23 rain days (302h) · 288 sun hours · 74% humidity · Busy crowd · UV 11 (very high) · sunniest 1 in 10 days reach 12 (extreme)
September
2/103–10°C (feels 8°C) · 23 rain days (298h) · 260 sun hours · 75% humidity · Quiet crowd · UV 10 (very high) · sunniest 1 in 10 days reach 11 (extreme)
October
2/103–10°C (feels 8°C) · 24 rain days (334h) · 251 sun hours · 78% humidity · Moderate crowd · UV 8 (very high)
December
2/101–7°C (feels 5°C) · 21 rain days (280h) · 227 sun hours · 79% humidity · Peak crowd · UV 5 (moderate) · sunniest 1 in 10 days reach 6 (high)
Frequently asked questions about visiting Haleakalā
When is the best time to visit Haleakalā?
July is the highest-scoring month (4/10 on the Holiday Climate Index). Typical conditions: 3–10°C (17 rainy days). The top three months by score are July, June, November.
What is the worst time to visit Haleakalā?
March is the lowest-scoring month (1/10). Typical conditions: 1–7°C (27 rainy days).
When are crowds lowest in Haleakalā?
Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in December. 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.
What is the UV index in Haleakalā by month?
UV peaks at 11 (very high) in July and is lowest in December at 5 (moderate). Monthly peak values: Jan 6, Feb 7, Mar 8, Apr 9, May 9, Jun 10, 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 Haleakalā in July?
July is the peak UV month in Haleakalā, with a daily-peak UV index of 11 (very high). 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 Haleakalā 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. August 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, July, August, September, December. Plan sun protection for the worst case, not the average.