Daily weather brief — Guam, 2026-08-23
TL;DR — the four things that matter today
- Beach / water safety: IN — ocean conditions look manageable.
→ Beach day is fine. Still watch the flags and don’t swim alone. - Heat / comfort: WARM — high near 88°F.
→ Stay hydrated and take shade breaks if you’re working outdoors. - Rain / storm outlook: YES — thunderstorms likely (28% chance).
→ Bring an umbrella or rain jacket, plan indoor backup for outdoor events, and unplug sensitive electronics if storms hit. - Typhoon / emergency threat: NO — no tropical threat in the Marianas.
→ Nothing to prepare for right now. Recheck the brief tomorrow.
The full brief
Active alerts
- Hydrologic Outlook (Unknown) — expires Sun Aug 23, 07:45 PM ChST.
Hydrologic Outlook issued August 22 at 7:43PM ChST by NWS Tiyan GU - High Surf Advisory (Minor) — expires Sun Aug 23, 09:00 AM ChST.
High Surf Advisory issued August 22 at 6:58PM ChST until August 23 at 4:00PM ChST by NWS Tiyan GU - Rip Current Statement (Moderate) — expires Sun Aug 23, 09:00 AM ChST.
Rip Current Statement issued August 22 at 6:58PM ChST until August 23 at 4:00PM ChST by NWS Tiyan GU
Today: Sunday — scattered showers and thunderstorms, high 88°F. Wind SW 15 to 20 mph mph. Heat index stays close to the air temperature today; humidity is the main comfort factor.
What to do: Stay hydrated and take shade breaks if you’re working outdoors.
Tonight: Sunday Night — scattered showers and thunderstorms, low 78°F. Wind SW 10 to 15 mph mph.
What to do: keep an umbrella by the door for the morning commute.
2–3 day outlook:
- Monday: scattered showers and thunderstorms, 86°F, wind SW 10 to 15 mph mph.
- Monday Night: scattered showers and thunderstorms, 77°F, wind SW 5 to 15 mph mph.
- Tuesday: scattered showers and thunderstorms, 85°F, wind WSW 5 to 10 mph mph.
- Tuesday Night: chance showers and thunderstorms, 78°F, wind WSW 5 to 10 mph mph.
What to do: plan outdoor events around the wettest day in the outlook, and book indoor backups if rain chances are high.
Have a safe day, and check back tomorrow for the next brief.