May is close to Hagatna's year-round average, with average highs near 28.6°C and lows around 27.8°C (mean 28.2°C). It is one of the drier months, averaging 56 mm of rainfall and 80% relative humidity across the period.
May is close to Hagatna's year-round average. Across 45 years of records, the warmest Mays in Hagatna were 2021 and 2025 — when the month averaged 29°C — while the coldest was 1983 at 27°C. Typical May days reach 28.6°C with nights near 27.8°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Hagatna, averaging 56 mm of rainfall. The wettest May on record was 2023 with 264 mm, while the driest was 1987 at 3 mm.
Relative humidity in Hagatna during May averages 80%. The most humid May was 2002 at 83%, and the least humid was 1997 at 75%.
May receives about 6.6 kWh/m²/day of solar energy in Hagatna. The sunniest Mays were 1997, 2017 and 2019 at 7.1 kWh/m²/day, and the cloudiest was 2023 at 5.8.
Average wind speed in Hagatna during May is 5.1 m/s. The windiest May was 1998 at 6.1 m/s, while the calmest was 2019 at 3.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.7°C | 28.0°C | 28.2°C | 28.5°C | 28.7°C | +1°C |
| Avg High | 28.1°C | 28.4°C | 28.6°C | 29.0°C | 29.1°C | +1°C |
| Avg Low | 27.3°C | 27.5°C | 27.8°C | 28.1°C | 28.3°C | +1°C |
| Avg Rain | 58 mm | 30 mm | 76 mm | 54 mm | 68 mm | +9 mm |
May temperatures in Hagatna have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 25.7°C (1992) to a record high of 30.2°C (1997).
Rainfall in May is one of the drier months, averaging 56 mm, with a wettest year of 264 mm.
A good time to visit Hagatna
May is a good time to visit Hagatna, with days averaging 28.6°C and nights around 27.8°C (mean 28.2°C, close to Hagatna's yearly average) and moderate rainfall. March and February are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.4°C | 29.0°C | 28.5°C | 29.9°C | 28.0°C | 15 mm | 78% | 5 m/s | 7 |
| 2024 | 29.2°C | 28.8°C | 28.3°C | 29.6°C | 27.5°C | 22 mm | 79% | 5.6 m/s | 6.8 |
| 2023 🌧️ | 28.9°C | 28.4°C | 28.0°C | 30.0°C | 27.0°C | 264 mm | 82% | 5.4 m/s | 5.8 |
| 2022 | 28.9°C | 28.5°C | 28.0°C | 29.6°C | 27.1°C | 21 mm | 81% | 4.9 m/s | 6.9 |
| 2021 🔥 | 29.3°C | 29.0°C | 28.7°C | 29.7°C | 28.0°C | 48 mm | 80% | 6 m/s | 6.5 |
| 2020 | 28.9°C | 28.5°C | 28.1°C | 29.6°C | 27.2°C | 35 mm | 80% | 5.7 m/s | 6.7 |
| 2019 | 28.8°C | 28.3°C | 27.8°C | 29.7°C | 26.8°C | 18 mm | 79% | 3.9 m/s | 7.1 |
| 2018 | 28.9°C | 28.5°C | 28.1°C | 30.1°C | 27.4°C | 43 mm | 81% | 4 m/s | 6.7 |
| 2017 | 29.1°C | 28.6°C | 28.2°C | 29.5°C | 27.3°C | 10 mm | 78% | 5.4 m/s | 7.1 |
| 2016 | 28.8°C | 28.3°C | 27.8°C | 29.6°C | 27.2°C | 28 mm | 78% | 5.1 m/s | 6.7 |
| 2015 | 28.7°C | 28.2°C | 27.8°C | 29.1°C | 27.2°C | 78 mm | 80% | 5.4 m/s | 6.3 |
| 2014 | 29.2°C | 28.7°C | 28.2°C | 29.8°C | 27.4°C | 67 mm | 79% | 4.4 m/s | 6.8 |
| 2013 | 29.1°C | 28.6°C | 28.1°C | 29.7°C | 27.6°C | 58 mm | 79% | 4.2 m/s | 6.8 |
| 2012 | 29.2°C | 28.8°C | 28.3°C | 30.0°C | 27.2°C | 149 mm | 80% | 4.8 m/s | 6.3 |
| 2011 | 29.1°C | 28.8°C | 28.5°C | 29.9°C | 28.0°C | 68 mm | 81% | 5.8 m/s | 6.6 |
| 2010 | 28.8°C | 28.3°C | 27.9°C | 29.5°C | 27.0°C | 15 mm | 79% | 5.2 m/s | 6.8 |
| 2009 | 28.7°C | 28.3°C | 27.9°C | 29.4°C | 26.7°C | 65 mm | 80% | 4.6 m/s | 6.6 |
| 2008 | 28.7°C | 28.3°C | 27.8°C | 29.3°C | 26.8°C | 67 mm | 78% | 5.1 m/s | 6.4 |
| 2007 | 28.7°C | 28.3°C | 27.9°C | 29.3°C | 27.3°C | 71 mm | 80% | 5.3 m/s | 6.3 |
| 2006 | 28.5°C | 28.1°C | 27.7°C | 29.1°C | 27.0°C | 154 mm | 80% | 5.2 m/s | 6.7 |
| 2005 | 28.5°C | 28.1°C | 27.7°C | 29.4°C | 26.8°C | 86 mm | 79% | 4.9 m/s | 6.6 |
| 2004 | 28.8°C | 28.4°C | 28.1°C | 29.4°C | 27.3°C | 54 mm | 79% | 5.4 m/s | 6.6 |
| 2003 | 28.5°C | 28.1°C | 27.7°C | 29.4°C | 27.0°C | 63 mm | 81% | 5.5 m/s | 6.2 |
| 2002 | 28.5°C | 28.1°C | 27.8°C | 29.0°C | 26.5°C | 93 mm | 83% | 5.2 m/s | 6.5 |
| 2001 | 28.9°C | 28.4°C | 28.0°C | 29.6°C | 27.4°C | 24 mm | 79% | 4.6 m/s | 6.9 |
| 2000 | 28.4°C | 28.0°C | 27.6°C | 29.3°C | 26.5°C | 80 mm | 81% | 4.9 m/s | 6.3 |
| 1999 | 28.6°C | 28.3°C | 27.9°C | 29.3°C | 27.0°C | 48 mm | 79% | 5.2 m/s | 6.6 |
| 1998 | 28.3°C | 27.9°C | 27.5°C | 29.0°C | 26.8°C | 27 mm | 79% | 6.1 m/s | 6.7 |
| 1997 | 28.7°C | 28.2°C | 27.6°C | 30.2°C | 26.9°C | 23 mm | 75% | 4.5 m/s | 7.1 |
| 1996 | 28.8°C | 28.4°C | 28.0°C | 29.8°C | 27.1°C | 15 mm | 79% | 5.2 m/s | 6.9 |
| 1995 | 28.5°C | 28.1°C | 27.7°C | 29.3°C | 26.9°C | 34 mm | 79% | 5.7 m/s | 6.5 |
| 1994 | 28.3°C | 27.9°C | 27.6°C | 28.9°C | 26.3°C | 61 mm | 80% | 5.5 m/s | 6.6 |
| 1993 | 28.0°C | 27.6°C | 27.1°C | 28.9°C | 26.4°C | 9 mm | 78% | 5.5 m/s | 6.9 |
| 1992 | 27.7°C | 27.3°C | 26.8°C | 28.5°C | 25.7°C | 16 mm | 78% | 4.7 m/s | 6.8 |
| 1991 | 28.3°C | 27.9°C | 27.5°C | 29.1°C | 26.5°C | 44 mm | 81% | 6 m/s | 6.6 |
| 1990 | 28.4°C | 27.9°C | 27.5°C | 29.0°C | 26.8°C | 23 mm | 81% | 5.4 m/s | 6.7 |
| 1989 | 28.4°C | 28.0°C | 27.7°C | 28.9°C | 27.2°C | 20 mm | 81% | 5.9 m/s | 6.7 |
| 1988 | 28.4°C | 28.0°C | 27.5°C | 28.8°C | 26.9°C | 24 mm | 80% | 4.8 m/s | 6.7 |
| 1987 | 28.0°C | 27.5°C | 27.0°C | 28.8°C | 26.1°C | 3 mm | 80% | 4.8 m/s | 7 |
| 1986 | 27.9°C | 27.5°C | 27.1°C | 28.9°C | 26.4°C | 58 mm | 81% | 4.4 m/s | 6.5 |
| 1985 | 27.9°C | 27.6°C | 27.2°C | 28.8°C | 26.0°C | 179 mm | 82% | 4.2 m/s | 6.2 |
| 1984 | 28.8°C | 28.4°C | 28.0°C | 29.6°C | 27.4°C | 23 mm | 78% | 4.4 m/s | 6.7 |
| 1983 ❄️ | 27.5°C | 27.0°C | 26.6°C | 28.0°C | 26.2°C | 25 mm | 80% | 5.9 m/s | — |
| 1982 | 27.8°C | 27.4°C | 27.0°C | 28.5°C | 25.8°C | 137 mm | 82% | 5.9 m/s | — |
| 1981 | 28.6°C | 28.2°C | 27.9°C | 29.1°C | 26.9°C | 56 mm | 80% | 5.2 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 28.6°C with lows near 27.8°C (mean 28.2°C), based on 45 years of NASA POWER data.
May averages 56 mm of rainfall in Hagatna, one of the drier months. The wettest on record was 264 mm in 2023.
The hottest May reached 30.2°C in 1997. The coldest dipped to 25.7°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1°C. Daytime highs moved from 28.1°C to 29.1°C and overnight lows from 27.3°C to 28.3°C over the same span.
May is close to Hagatna's year-round average and one of the drier months, so plan for around 28.6°C daytime highs and 27.8°C at night.
Not quite — May is the 6th coolest month in Hagatna, averaging 28.2°C.
For May in Hagatna, pack light layers you can adjust through the day, with typical highs of 28.6°C and lows of 27.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 80% — quite humid.
Average wind speed in May is 5.1 m/s. The windiest May on record averaged 6.1 m/s (1998).
The wettest May on record was 2023 with 264 mm. On average, May sees 56 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Hagatna behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
