Agana Heights, Guam Weather Conditions

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Current Conditions

  • 77°
  • Mostly Cloudy
  • Wind: West 5 mph
  • Humidity: 94%
  • Visibility: 10.0 miles
  • Dew Point: 75°
  • Pressure: 29.74 in. +

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Next 12 Hours

7  pm
10  pm
1  am
4  am
7  am
Thunderstorm
T-storms
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T-storms
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79°
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77°
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77°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Thunderstorm
  • High: 86 °
  • Low: 77 °
  • T-Storms
  • Thursday
  • Thunderstorm
  • High: 88 °
  • Low: 77 °
  • Thunderstorm
  • Friday
  • Thunderstorm
  • High: 88 °
  • Low: 84 °
  • Thunderstorm
  • Saturday
  • Chance of a Thunderstorm
  • High: 88 °
  • Low: 77 °
  • Chance of T-Storms
  • Sunday
  • Chance of a Thunderstorm
  • High: 88 °
  • Low: 82 °
  • Chance of T-Storms

Forecast for Agana Heights, Guam

Updated: 7:00 PM ChST on September 23, 2014

  • Tuesday

    Mostly cloudy with thunderstorms and rain showers. High of 88F with a heat index of 95F. Winds from the NW at 5 to 10 mph. Chance of rain 40%.

  • Tuesday Night

    Partly cloudy with thunderstorms and rain showers. Fog overnight. Low of 75F. Winds from the WNW at 10 to 15 mph. Chance of rain 40%.

  • Wednesday

    Partly cloudy with thunderstorms and rain showers. High of 86F with a heat index of 91F. Breezy. Winds from the West at 15 to 20 mph. Chance of rain 30%.

  • Wednesday Night

    Partly cloudy with thunderstorms and rain showers. Low of 77F. Breezy. Winds from the WSW at 15 to 20 mph. Chance of rain 20%.

  • Thursday

    Partly cloudy with thunderstorms and rain showers. High of 88F with a heat index of 97F. Breezy. Winds from the WSW at 15 to 20 mph. Chance of rain 20%.

  • Thursday Night

    Partly cloudy with thunderstorms and rain showers. Low of 77F. Breezy. Winds from the SW at 15 to 20 mph. Chance of rain 20%.

  • Friday

    Partly cloudy with thunderstorms and rain showers in the morning, then overcast. High of 88F with a heat index of 99F. Breezy. Winds from the SW at 15 to 25 mph. Chance of rain 20%.

  • Friday Night

    Overcast with a chance of a thunderstorm and rain. Low of 84F with a heat index of 95F. Breezy. Winds from the SW at 20 to 25 mph. Chance of rain 60% with rainfall amounts near 0.8 in. possible.

  • Saturday

    Overcast with a chance of a thunderstorm and rain. High of 88F with a heat index of 93F. Breezy. Winds from the SW at 20 to 25 mph. Chance of rain 70% with rainfall amounts near 0.5 in. possible.

  • Saturday Night

    Overcast with thunderstorms. Low of 77F. Breezy. Winds from the SW at 15 to 20 mph. Chance of rain 80% with rainfall amounts near 1.7 in. possible.

  • Sunday

    Overcast with a chance of a thunderstorm. High of 88F with a heat index of 93F. Breezy. Winds from the WSW at 15 to 20 mph. Chance of rain 60% with rainfall amounts near 0.3 in. possible.

  • Sunday Night

    Mostly cloudy with a chance of a thunderstorm. Low of 82F with a heat index of 91F. Breezy. Winds from the West at 15 to 20 mph. Chance of rain 70% with rainfall amounts near 1.0 in. possible.

  • Monday

    Overcast with a chance of a thunderstorm. High of 86F. Winds from the WNW at 5 to 15 mph. Chance of rain 60%.

  • Monday Night

    Overcast. Low of 77F. Winds from the NW at 5 to 15 mph.

  • Tuesday

    Mostly cloudy. High of 86F. Winds from the WNW at 5 to 15 mph.

  • Tuesday Night

    Partly cloudy. Low of 84F. Winds from the WSW at 10 to 15 mph.

  • Wednesday

    Overcast with a chance of a thunderstorm. High of 88F. Winds from the WSW at 5 to 20 mph. Chance of rain 30%.

  • Wednesday Night

    Overcast with a chance of a thunderstorm. Low of 77F. Winds from the WSW at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.5 in. possible.

  • Thursday

    Overcast with a chance of a thunderstorm. High of 86F. Winds from the SW at 5 to 10 mph. Chance of rain 50% with rainfall amounts near 0.3 in. possible.

  • Thursday Night

    Overcast with a chance of a thunderstorm. Low of 77F. Winds from the SW at 5 to 10 mph. Chance of rain 50%.

  • Friday

    Mostly cloudy with a chance of a thunderstorm. High of 86F. Winds from the SSW at 5 to 15 mph. Chance of rain 50%.

  • Friday Night

    Mostly cloudy with a chance of a thunderstorm. Low of 79F. Winds from the SSW at 10 to 15 mph. Chance of rain 50%.

  • Saturday

    Clear with a chance of a thunderstorm. High of 84F. Winds from the SSW at 10 to 15 mph. Chance of rain 30%.

  • Saturday Night

    Clear. Low of 79F. Breezy. Winds from the SW at 10 to 25 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Maite, Maite, GU

Updated: 8:18 PM ChST

Temperature: 77.8 °F Dew Point: 75 °F Humidity: 92% Wind: WSW at 3.0 mph Pressure: 29.75 in Hourly Precipitation: 0.02 in Heat Index: 80 °F Graphs

Location: Ordot Dump, Chalan Pago Ordot

Updated: 8:18 PM ChST

Temperature: 75.9 °F Dew Point: 75 °F Humidity: 96% Wind: West at 4.0 mph Pressure: 29.72 in Hourly Precipitation: 0.02 in Heat Index: 75 °F Graphs

Location: Perezville, Tamuning, Guam

Updated: 8:15 PM ChST

Temperature: 77.8 °F Dew Point: 75 °F Humidity: 91% Wind: SSW at 3.0 mph Pressure: 29.63 in Hourly Precipitation: 0.03 in Heat Index: 80 °F Graphs

Location: Mangilao, Mangilao, GU

Updated: 8:18 PM ChST

Temperature: 75.8 °F Dew Point: 68 °F Humidity: 77% Wind: WNW at 3.0 mph Pressure: 29.73 in Hourly Precipitation: 0.06 in Heat Index: 77 °F Graphs

Location: Jeffs Pirates Cove, Guam, Ipan Talofofo, GU

Updated: 8:18 PM ChST

Temperature: 76.2 °F Dew Point: 74 °F Humidity: 93% Wind: Calm Pressure: 29.67 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Ypaopao Estates, Dededo

Updated: 8:13 PM ChST

Temperature: 76.5 °F Dew Point: 72 °F Humidity: 85% Wind: NNW at 2.0 mph Pressure: 29.31 in Hourly Precipitation: 0.18 in Heat Index: 77 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service tiyan GU 
404 PM chst Tuesday Sep 23 2014 


Marianas synopsis... 
latest ascat/windsat imagery...as well as animated radar and 
visible satellite imagery suggest jtwc high invest area 98w is 
centered about 200 miles east of Saipan near 15n147e. 98w is an 
elongated and poorly defined system...so confidence on the exact 
location of the center is low. 98w is a large system. A TUTT cell 
is centered on the north side of 98w near 20n151e. These two 
factors both suggest 98w will not rapidly develop. 


&& 


Discussion... 
ascat/windsat streamline analysis indicated winds on the 
periphery of 98w were quite a bit higher than they were in the 
forecast grids. Have accordingly updated wind grids for days 1 
through 4 to more closely align with model consensus as well. 
Large size and proximity of 98w both argue for adding scattered 
showers to the forecast for tonight. Considered adding scattered 
showers for Wednesday and Wednesday night as well...but held off 
on this based on the latest gfs40 run...which best initializes the 
dry air and lack of convection on the northwest side of 98w. 98w 
should depart the forecast zones by Thursday afternoon...but it 
will leave the monsoon trough behind. Kept mostly cloudy and 
isolated thunderstorm wording in the forecast through day 7. Next 
possible weather maker is a system centered between Kosrae and 
kwajalein. If this system develops and moves toward the 
marianas...scattered showers may be needed in the forecast for 
this weekend. 


&& 


Marine... 
made significant updates to the marine forecast grids. Increased 
winds and seas for days 1 through 4. Latest ascat and windsat 
imagery indicated winds of 20 to 25 knots on the periphery of 
98w...with lighter winds toward the center of the system. Did go 
with a larger range in swell and surf based upon blocking of the 
primary northeast swell by Saipan and Tinian. Latest forecast 
update stops just short of advisory conditions for Thursday and 
Friday. If 98w develops further...advisories may be required 
during this time frame. 


&& 


Eastern micronesia... 
ascat analysis shows a monsoon trough runs southeastward from the 
circulation just east of Saipan into a weak circulation centered 
between kwajalein and Kosrae near 8n165e. Satellite shows patchy 
areas of scattered showers across Pohnpei and Kosrae states. 
Models generally indicate the monsoon trough will slowly lift 
toward the northwest...so there should be a gradual drying trend 
for Pohnpei and Kosrae through this week. Fairly dry weather 
prevails on Majuro through the near term...but the GFS in 
particular indicates more showers could move across the rmi this 
weekend as another trade disturbance arrives from the east. 


&& 


Western micronesia... 
ascat analysis shows monsoon west to southwest winds prevail 
across this whole area...and a developing circulation just east 
of Saipan this afternoon seems to be moving slowly toward the 
north- northwest. Wind flow across Chuuk...Yap and Koror will 
continue to be unstable but the bulk of shower activity is 
expected to remain north of these forecast points. Monsoonal 
winds across Yap and Koror could increase further in the coming 
days and future shifts will need to monitor for possible higher 
sea conditions or greater shower coverage. Chuuk will be at risk 
for more showers arriving with a disturbance from eastern 
micronesia by about Saturday or Sunday. 


&& 


Gum watches/warnings/advisories... 
GU...none. 
Marianas waters...none. 
&& 


$$ 


McElroy/devita/Simpson 



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