Point Forecast Matrices
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
Versions:
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073 FOMY50 PGUM 161746 PFMGUM Point Forecast Matrices National Weather Service Tiyan GU 346 AM ChST Thu Sep 17 2026 GUZ001-170600- Guam International Airport-Tiyan GU 13.48N 144.79E Elev. 248 ft 346 AM ChST Thu Sep 17 2026 Date Thu 09/17/26 Fri 09/18/26 Sat 09/19/26 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 79 87 79 87 Temp 78 79 83 87 86 85 83 81 79 80 84 87 86 85 83 81 79 80 84 87 86 Dewpt 78 79 79 79 79 79 80 80 79 79 79 79 79 79 80 80 79 79 79 79 79 RH 100100 88 77 80 82 91 97100 97 85 77 80 82 91 97100 97 85 77 80 Wind dir W W W W W W W W W W SW SW W W W W W W SW SW W Wind spd 8 10 11 12 12 10 9 8 6 9 11 13 14 12 10 8 6 8 10 10 9 Clouds B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 30 30 40 40 QPF 12hr 0.13 0.12 0.14 0.18 0.11 Rain shwrs C C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S S S S S S Heat index 95101101 98 94 90 85 87 96101100 98 94 90 85 87 95101100 Max heat 95 101 100 93 96 101 100 93 95 101 Date Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 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 79 87 79 87 79 86 79 87 Temp 83 79 84 86 83 79 84 86 83 79 83 85 82 79 84 86 Dewpt 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 PWind dir SW W W S SW SW SW S Wind char LT LT LT LT LT LT LT GN Avg clouds B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 40 40 40 50 50 50 50 50 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ001-170600- Rota International Airport-Sinapalu MP 14.17N 145.23E Elev. 592 ft 346 AM ChST Thu Sep 17 2026 Date Thu 09/17/26 Fri 09/18/26 Sat 09/19/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 79 87 79 87 Temp 77 78 83 87 86 85 83 81 79 80 84 87 86 85 83 81 79 80 84 87 86 Dewpt 77 78 79 79 79 79 80 79 79 79 79 79 79 80 80 80 79 79 79 79 79 RH 100100 88 77 80 82 91 94100 97 85 77 80 85 91 97100 97 85 77 80 Wind dir W W W W W W W W W SW SW SW SW SW W SW SW SW SW SW SW Wind spd 8 9 10 11 11 10 9 8 6 8 10 12 13 12 9 6 5 8 9 8 6 Wind gust 18 Clouds B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 30 30 30 30 QPF 12hr 0.04 0.07 0.06 0.12 0.09 Rain shwrs C C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S S S S S S Heat index 94101101 98 94 90 85 86 96101101 98 94 90 85 86 96101100 Max heat 94 101 100 93 96 101 100 93 96 101 Date Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 78 86 79 84 79 85 Temp 83 79 84 86 82 79 83 85 82 79 82 83 81 79 83 85 Dewpt 80 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 PWind dir SW SW W E S S S S Wind char LT LT LT LT LT LT LT GN Avg clouds B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 30 30 40 50 50 50 50 50 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ002-170600- Tinian-San Jose MP 14.97N 145.63E Elev. 74 ft 346 AM ChST Thu Sep 17 2026 Date Thu 09/17/26 Fri 09/18/26 Sat 09/19/26 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 79 87 79 87 Temp 77 78 83 87 86 85 83 81 79 80 84 87 86 85 83 81 79 80 84 87 86 Dewpt 77 78 79 79 79 79 79 80 79 79 79 79 79 80 80 80 79 79 79 79 79 RH 100100 88 77 80 82 88 97100 97 85 77 80 85 91 97100 97 85 77 80 Wind dir W W W W W W W W W SW SW SW SW SW SW SW SW SW SW SW SW Wind spd 9 9 10 11 12 11 10 8 8 9 11 13 13 12 10 8 6 8 9 9 9 Wind gust 19 18 Clouds B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 30 30 30 30 QPF 12hr 0.05 0.11 0.07 0.10 0.06 Rain shwrs C C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S S S S S S Heat index 94101100 98 94 90 85 86 96101101 98 94 90 85 86 95101100 Max heat 94 101 99 93 96 101 100 93 95 101 Date Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 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 79 87 78 87 79 87 79 87 Temp 83 79 84 86 82 79 84 86 83 79 84 86 83 79 84 86 Dewpt 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 PWind dir SW SW W E SE S S S Wind char LT LT LT LT LT LT LT GN Avg clouds B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 30 30 40 40 50 50 50 50 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$ MPZ003-170600- Saipan International Airport-Obyan MP 15.11N 145.72E Elev. 215 ft 346 AM ChST Thu Sep 17 2026 Date Thu 09/17/26 Fri 09/18/26 Sat 09/19/26 ChST3hrly 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 UTC 3hrly 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 Max/Min 87 79 87 79 87 Temp 77 78 83 87 86 85 83 81 79 80 84 87 86 85 83 81 79 80 84 87 86 Dewpt 77 78 79 79 79 79 79 80 79 79 79 79 79 80 80 80 79 79 79 79 79 RH 100100 88 77 80 82 88 97100 97 85 77 80 85 91 97100 97 85 77 80 Wind dir W W W W W W W W W SW SW SW SW SW SW SW SW SW SW SW SW Wind spd 9 10 11 12 12 11 10 8 8 9 12 13 13 12 10 8 6 8 9 10 9 Wind gust 20 18 Clouds B2 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 B1 PoP 12hr 40 30 30 30 30 QPF 12hr 0.05 0.10 0.06 0.10 0.06 Rain shwrs C C C C C C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S S S S S S Heat index 94101100 98 94 90 85 86 96101101 98 94 90 85 86 95101100 Max heat 94 101 99 93 96 101 100 93 95 101 Date Sun 09/20/26 Mon 09/21/26 Tue 09/22/26 Wed 09/23/26 ChST6hrly 22 04 10 16 22 04 10 16 22 04 10 16 22 04 10 16 UTC 6hrly 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 Min/Max 79 87 79 87 79 87 79 87 Temp 83 79 84 86 83 79 84 86 83 79 84 86 83 79 84 86 Dewpt 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 79 PWind dir SW SW S E SE S S S Wind char LT LT LT LT LT LT LT GN Avg clouds B1 B1 B1 B1 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 PoP 12hr 30 30 40 40 50 50 50 50 Rain shwrs C C C C C C C C C C C C C C C C Tstms S S S S S S S S S S S S S S S S $$