Point Forecast Matrices
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
581 FOMY50 PGUM 121816 PFMGUM Point Forecast Matrices National Weather Service Tiyan GU 415 AM ChST Thu Aug 13 2026 GUZ001-130600- Guam International Airport-Tiyan GU 13.48N 144.79E Elev. 248 ft 415 AM ChST Thu Aug 13 2026 Date Thu 08/13/26 Fri 08/14/26 Sat 08/15/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 78 88 78 87 Temp 79 83 87 86 84 82 80 79 79 84 88 87 85 83 80 79 79 83 87 86 Dewpt 78 78 78 78 78 78 78 78 78 78 78 78 78 79 79 78 78 78 78 78 RH 97 85 75 77 82 88 94 97 97 82 72 75 80 88 97 97 97 85 75 77 Wind dir SW SW SW W SW SW SW W W W W W W W W W W W W W Wind spd 8 11 12 12 9 6 6 6 8 11 12 11 9 6 6 6 8 12 13 13 Clouds SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC PoP 12hr 10 10 10 20 20 QPF 12hr 0.01 0.01 0.01 0.02 0.05 Rain shwrs S S S S S S S S S S S S S S S S S S S S Tstms S S S S Heat index 93 99 99 96 92 86 95101100 97 93 88 94100 99 Max heat 93 100 98 90 95 101 99 91 94 100 High Surf Y Y Y Y Y Y Y Date Sun 08/16/26 Mon 08/17/26 Tue 08/18/26 Wed 08/19/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 78 86 77 86 77 87 78 87 Temp 82 79 83 85 81 78 82 85 81 78 83 86 82 79 83 86 Dewpt 79 78 79 79 79 77 78 78 77 77 77 77 77 77 77 77 PWind dir SW SW W SW W NW N N Wind char GN GN GN GN LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 30 30 30 30 20 20 Rain shwrs S S C C C C C C C C C S S S S S Tstms S S S S S S S S S S S S S S S S $$ MPZ001-130600- Rota International Airport-Sinapalu MP 14.17N 145.23E Elev. 592 ft 415 AM ChST Thu Aug 13 2026 Date Thu 08/13/26 Fri 08/14/26 Sat 08/15/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 86 77 87 77 86 Temp 78 82 86 85 83 81 78 77 78 83 87 86 84 81 79 77 78 82 86 85 Dewpt 77 78 79 79 79 79 78 77 77 78 79 79 79 79 78 76 77 79 79 79 RH 97 88 80 82 88 94100100 97 85 77 80 85 94 97 97 97 91 80 82 Wind dir SW SW SW SW SW SW SW SW SW SW W W W W W W W SW W W Wind spd 11 12 12 12 11 8 9 9 10 12 12 12 10 9 9 9 10 12 13 13 Clouds SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC PoP 12hr 10 10 10 20 20 QPF 12hr 0.01 0.02 0.02 0.02 0.04 Rain shwrs S S S S S S S S S S S S S S S S S S S S Tstms S S S S Heat index 92 98 98 94 90 93100 99 96 91 92 99 98 Max heat 92 98 97 86 93 100 98 89 92 99 High Surf Y Y Y Y Y Y Y Date Sun 08/16/26 Mon 08/17/26 Tue 08/18/26 Wed 08/19/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 77 85 76 85 76 86 77 86 Temp 81 77 82 84 80 76 81 84 80 76 82 85 81 77 82 85 Dewpt 79 76 79 79 79 75 79 79 78 76 77 77 78 77 78 78 PWind dir SW SW SW SW SW NW N N Wind char GN GN GN GN LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 30 30 30 30 20 20 Rain shwrs S S C C C C C C C C C S S S S S Tstms S S S S S S S S S S S S S S S S $$ MPZ002-130600- Tinian-San Jose MP 14.97N 145.63E Elev. 74 ft 415 AM ChST Thu Aug 13 2026 Date Thu 08/13/26 Fri 08/14/26 Sat 08/15/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 78 88 78 87 Temp 79 83 87 86 84 82 80 79 79 84 88 87 85 83 80 79 79 83 87 86 Dewpt 79 79 79 79 79 79 79 79 79 79 79 79 79 80 79 78 78 79 79 79 RH 100 88 77 80 85 91 97100100 85 75 77 82 91 97 97 97 88 77 80 Wind dir SW SW SW SW SW SW SW W SW SW SW W W W W W SW SW SW SW Wind spd 13 14 14 13 12 10 11 13 13 14 16 14 12 10 11 10 11 13 14 14 Clouds SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC PoP 12hr 10 10 10 20 20 QPF 12hr 0.01 0.02 0.03 0.05 0.06 Rain shwrs S S S S S S S S S S S S S S S S S S S S Tstms S S S S S S S S Heat index 94101100 97 92 86 95102102 98 94 88 95101100 Max heat 94 101 99 91 95 102 101 92 95 101 High Surf Y Y Y Y Y Y Y Date Sun 08/16/26 Mon 08/17/26 Tue 08/18/26 Wed 08/19/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 78 86 77 86 77 87 78 87 Temp 82 79 83 85 81 78 82 85 81 78 83 86 82 79 83 86 Dewpt 80 78 79 80 80 77 79 79 78 78 77 77 78 78 78 78 PWind dir SW SW SW SW SW N NE NE Wind char GN GN GN GN LT LT LT LT Avg clouds SC B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 30 30 30 30 20 20 Rain shwrs S S C C C C C C C C C S S S S S Tstms S S S S S S S S S S S S S S S S $$ MPZ003-130600- Saipan International Airport-Obyan MP 15.11N 145.72E Elev. 215 ft 415 AM ChST Thu Aug 13 2026 Date Thu 08/13/26 Fri 08/14/26 Sat 08/15/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 78 88 78 87 Temp 79 83 87 86 84 82 80 79 79 84 88 87 85 83 80 79 79 83 87 86 Dewpt 79 79 79 79 79 79 79 79 79 79 79 79 79 80 79 78 78 79 79 79 RH 100 88 77 80 85 91 97100100 85 75 77 82 91 97 97 97 88 77 80 Wind dir SW SW W SW SW SW SW SW W W SW W W W W W SW SW SW SW Wind spd 13 16 14 13 12 10 10 11 13 16 16 14 12 11 11 10 11 14 14 14 Clouds SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC PoP 12hr 10 10 10 20 20 QPF 12hr 0.01 0.02 0.03 0.06 0.07 Rain shwrs S S S S S S S S S S S S S S S S S S S S Tstms S S S S S S S S Heat index 94101100 97 93 86 95102102 99 94 88 95101100 Max heat 94 101 99 91 95 102 101 92 95 101 High Surf Y Y Y Y Y Y Y Date Sun 08/16/26 Mon 08/17/26 Tue 08/18/26 Wed 08/19/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 78 86 77 86 77 87 78 87 Temp 82 79 83 85 81 78 82 85 81 78 83 86 82 79 83 86 Dewpt 80 78 80 80 80 77 79 79 78 78 77 77 78 78 78 78 PWind dir SW SW SW SW SW E NE NE Wind char GN GN GN GN LT LT LT LT Avg clouds B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 20 30 30 30 30 30 20 20 Rain shwrs S S C C C C C C C C C S S S S S Tstms S S S S S S S S S S S S S S S S $$