5 places · sun position · panel angle
Solar data for Guam
Across the 5 places in Guam the best fixed tilt for solar panels is 12°, and flat ground gets 5.6 to 5.6 peak sun hours a day. Every number is computed for each place.
Solar power in Guam at a glance
Averages over 5 places with climate data, for a fixed array facing south.
- 5.60 peak sun hours a day
Peak sun hours a day on flat ground. Each dot is one place.
The sunniest places in Guam, with 5.60 peak sun hours a day on flat ground, are Yigo Village and one other place; the least sunny are Hagåtña and 2 other places with 5.59. A 1 kWp array at its best angle makes from 1,639 kWh a year in Hagåtña to 1,642 kWh in Yigo Village — 1,640 kWh on average.
The best year-round tilt is 12° everywhere. Off-grid systems are sized for the darkest month and do better steeper, at 5° on average: at 70° that month brings 1.24 kWh per kWp a day in Mangilao Village and 1.24 kWh in Dededo Village.
Size an off-grid system or open any place below for its sun path, monthly table and tilt curve.
Sunniest places in Guam
Ranked by peak sun hours on flat ground: the yearly average of a day's sunshine energy (NASA POWER climatology). Output: 1 kWp at its best year-round angle.
| Rank | Place | Region | Sun hours/day | kWh per kWp a year | Best tilt |
|---|---|---|---|---|---|
| 1 | Yigo Village | Yigo | 5.60 | 1,642 | 12° |
| 1 | Dededo Village | Dededo | 5.60 | 1,641 | 12° |
| 3 | Mangilao Village | Mangilao | 5.59 | 1,640 | 12° |
| 3 | Tamuning-Tumon-Harmon Village | Tamuning | 5.59 | 1,640 | 12° |
| 3 | Hagåtña | Hagatna | 5.59 | 1,639 | 12° |
Solar by region in Guam
Averages of the places in each region, sunniest first. Darkest month: what 1 kWp of off-grid panels at 70° makes a day in the worst month of the year.
| Region | Places | Sun hours/day | kWh per kWp a year | Best tilt | Darkest month at 70° | Sunniest place |
|---|---|---|---|---|---|---|
| Yigo | 1 | 5.60 | 1,642 | 12° | 1.24 kWh | Yigo Village |
| Dededo | 1 | 5.60 | 1,641 | 12° | 1.24 kWh | Dededo Village |
| Mangilao | 1 | 5.59 | 1,640 | 12° | 1.24 kWh | Mangilao Village |
| Tamuning | 1 | 5.59 | 1,640 | 12° | 1.24 kWh | Tamuning-Tumon-Harmon Village |
| Hagatna | 1 | 5.59 | 1,639 | 12° | 1.24 kWh | Hagåtña |
Largest places in Guam at a glance
| Place | Latitude | Best tilt | Off-grid tilt | Sun hours/day (flat) |
|---|---|---|---|---|
| Dededo Village | 13.5° N | 12° | 5° | 5.60 |
| Yigo Village | 13.5° N | 12° | 5° | 5.60 |
| Tamuning-Tumon-Harmon Village | 13.5° N | 12° | 5° | 5.59 |
| Mangilao Village | 13.4° N | 12° | 5° | 5.59 |
| Hagåtña | 13.5° N | 12° | 5° | 5.59 |
Daylight and clock time in Guam
In Yigo Village (13.5° N), the northernmost place, the longest day of the year lasts 12 h 56 min and the shortest 11 h 20 min; in Mangilao Village (13.4° N), the southernmost, 12 h 55 min and 11 h 20 min. Guam does not use daylight saving time: the clocks stay the same all year.
| Time zone | Places | UTC offset | Clocks change in 2026 |
|---|---|---|---|
| Pacific/Guam | 5 | UTC+10 | no daylight saving time |