Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
637
FNCA52 TJSJ 081930
FWFSJU
Fire Weather Planning Forecast for Puerto Rico
National Weather Service San Juan PR
330 PM AST Tue Sep 8 2026
.DISCUSSION...
No fire danger is expected today.
PRZ014-090800-
Southeast Coastal Plains-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Pcldy Pcldy Pcldy
Precip Type Showers Tstms Tstms Tstms
Chance Precip (%) 20 50 40 30
Temp (24h trend) 75 (-3) 88 (-2) 76 90
RH % (24h trend) 90 (0) 63 (-1) 93 61
Wind 20ft/early(mph) E 12 E 18 E 13 E 18
Wind 20ft/late(mph) NE 13 E 18 E 14 E 18
Mixing Hgt(ft-agl/msl) 5100 5050
Transport Wnd (mph) E 21 E 22
Vent Rate (kt-ft) 91800 95950
Dispersion 5 5
DSI 4 6 5 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ015-090800-
Southern Hills-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Pcldy Pcldy Pcldy
Precip Type Showers Tstms Tstms Tstms
Chance Precip (%) 10 40 20 40
Temp (24h trend) 72 (-3) 86 (0) 72 88
RH % (24h trend) 97 (+3) 67 (0) 99 66
Wind 20ft/early(mph) E 13 E 16 E 14 E 16
Wind 20ft/late(mph) E 13 E 14 E 16 E 14
Mixing Hgt(ft-agl/msl) 5540 5880
Transport Wnd (mph) E 20 E 21
Vent Rate (kt-ft) 94180 105840
Dispersion 5 5
DSI 3 6 3 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ016-090800-
North Coastal Plains-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Pcldy
Precip Type Showers Tstms Tstms Tstms
Chance Precip (%) 30 50 20 50
Temp (24h trend) 76 (-2) 88 (-1) 76 89
RH % (24h trend) 97 (+2) 71 (0) 99 68
Wind 20ft/early(mph) E 17 E 16 E 20 E 16
Wind 20ft/late(mph) E 12 E 19 E 17 E 18
Mixing Hgt(ft-agl/msl) 5120 5770
Transport Wnd (mph) E 22 E 21
Vent Rate (kt-ft) 97280 103860
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ017-090800-
Northern Hills-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Pcldy Mclear Pcldy
Precip Type Showers Tstms Showers Tstms
Chance Precip (%) 10 60 10 60
Temp (24h trend) 73 (-2) 87 (-1) 73 88
RH % (24h trend) 97 (0) 72 (+2) 99 69
Wind 20ft/early(mph) E 14 E 13 E 17 E 13
Wind 20ft/late(mph) E 10 E 18 E 14 E 16
Mixing Hgt(ft-agl/msl) 5940 7050
Transport Wnd (mph) E 18 SE 18
Vent Rate (kt-ft) 95040 112800
Dispersion 5 5
DSI 4 6 5 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ018-090800-
West Coast-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Pcldy Mclear Pcldy
Precip Type Showers Tstms None Tstms
Chance Precip (%) 0 50 0 50
Temp (24h trend) 73 (-3) 89 (-2) 75 91
RH % (24h trend) 98 (+2) 69 (+2) 98 67
Wind 20ft/early(mph) E 11 E 16 E 19 E 16
Wind 20ft/late(mph) E 11 E 16 E 18 E 17
Mixing Hgt(ft-agl/msl) 4720 5190
Transport Wnd (mph) E 16 E 17
Vent Rate (kt-ft) 66080 77850
Dispersion 5 5
DSI 4 6 4 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ019-090800-
Eastern Interior-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Pcldy
Precip Type Showers Tstms Tstms Tstms
Chance Precip (%) 50 50 50 50
Temp (24h trend) 73 (-4) 85 (-2) 73 88
RH % (24h trend) 97 (+3) 71 (+4) 99 68
Wind 20ft/early(mph) E 14 E 17 E 16 E 17
Wind 20ft/late(mph) E 16 E 16 E 17 E 16
Mixing Hgt(ft-agl/msl) 5870 5820
Transport Wnd (mph) E 20 SE 21
Vent Rate (kt-ft) 99790 104760
Dispersion 5 5
DSI 4 6 4 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ022-090800-
Luquillo Mountain Range-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Mcldy Mcldy Mcldy
Precip Type Tstms Tstms Tstms Tstms
Chance Precip (%) 70 60 70 60
Temp (24h trend) 71 (-3) 82 (0) 71 85
RH % (24h trend) 100 (+2) 77 (+2) 100 72
Wind 20ft/early(mph) E 11 E 14 E 12 E 14
Wind 20ft/late(mph) E 12 E 14 E 13 E 14
Mixing Hgt(ft-agl/msl) 4820 3880
Transport Wnd (mph) E 22 E 22
Vent Rate (kt-ft) 91580 73720
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ023-090800-
Central Mountain Range-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Pcldy Mclear Pcldy
Precip Type Showers Tstms Showers Tstms
Chance Precip (%) 10 50 0 60
Temp (24h trend) 69 (-4) 85 (+2) 70 86
RH % (24h trend) 98 (+1) 71 (-1) 100 70
Wind 20ft/early(mph) E 9 E 11 E 13 E 11
Wind 20ft/late(mph) E 9 E 11 E 13 E 11
Mixing Hgt(ft-agl/msl) 6920 7200
Transport Wnd (mph) E 15 SE 18
Vent Rate (kt-ft) 89960 115200
Dispersion 5 5
DSI 2 6 3 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ024-090800-
Cayey Mountain Range-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Mcldy
Precip Type Showers Tstms Tstms Tstms
Chance Precip (%) 50 60 60 50
Temp (24h trend) 72 (-2) 83 (0) 72 84
RH % (24h trend) 98 (0) 75 (+4) 100 73
Wind 20ft/early(mph) E 11 E 13 E 11 E 13
Wind 20ft/late(mph) E 11 E 13 E 12 E 13
Mixing Hgt(ft-agl/msl) 5090 4630
Transport Wnd (mph) E 21 E 22
Vent Rate (kt-ft) 91620 87970
Dispersion 5 5
DSI 5 6 5 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ025-090800-
Vieques-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Mcldy Mcldy
Precip Type Tstms Tstms Tstms Tstms
Chance Precip (%) 70 50 60 60
Temp (24h trend) 79 (-2) 87 (-2) 79 90
RH % (24h trend) 87 (+2) 65 (+3) 88 59
Wind 20ft/early(mph) E 18 E 19 E 19 E 20
Wind 20ft/late(mph) E 19 E 18 E 20 E 18
Mixing Hgt(ft-agl/msl) 3630 3230
Transport Wnd (mph) E 23 E 23
Vent Rate (kt-ft) 72600 64600
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ026-090800-
Culebra-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Pcldy
Precip Type Tstms Tstms Tstms Tstms
Chance Precip (%) 70 50 60 50
Temp (24h trend) 80 (-2) 87 (-2) 80 91
RH % (24h trend) 90 (+4) 69 (+2) 91 63
Wind 20ft/early(mph) E 18 E 19 E 19 E 20
Wind 20ft/late(mph) E 19 E 18 E 20 E 18
Mixing Hgt(ft-agl/msl) 3620 3220
Transport Wnd (mph) E 23 E 24
Vent Rate (kt-ft) 72400 67620
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$
PRZ027-090800-
Southwest Coastal Plains and Mona Island-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Mclear Mclear Mclear Mclear
Precip Type Showers Showers Showers Showers
Chance Precip (%) 10 20 10 30
Temp (24h trend) 75 (-3) 89 (-2) 76 90
RH % (24h trend) 90 (+1) 63 (+1) 92 60
Wind 20ft/early(mph) E 14 E 21 E 18 E 21
Wind 20ft/late(mph) E 13 E 21 E 13 E 23
Mixing Hgt(ft-agl/msl) 5000 5330
Transport Wnd (mph) E 24 E 24
Vent Rate (kt-ft) 105000 111930
Dispersion 5 5
DSI 5 6 5 6
RH Recovery Excellent Excellent
Remarks...None.
$$
VIZ001-090800-
Saint Thomas and Saint John-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms Tstms
Chance Precip (%) 70 40 60 40
Temp (24h trend) 79 (-2) 86 (-2) 79 89
RH % (24h trend) 91 (+4) 66 (+1) 93 62
Wind 20ft/early(mph) E 18 E 21 E 19 E 20
Wind 20ft/late(mph) E 20 E 19 E 20 E 19
Mixing Hgt(ft-agl/msl) 3560 3220
Transport Wnd (mph) E 24 E 26
Vent Rate (kt-ft) 74760 74060
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$
VIZ002-090800-
St Croix-
330 PM AST Tue Sep 8 2026
Tonight Wed Wed Night Thu
Cloud Cover Pcldy Pcldy Pcldy Pcldy
Precip Type Tstms Showers Tstms Showers
Chance Precip (%) 70 40 60 30
Temp (24h trend) 79 (-2) 87 (-2) 78 90
RH % (24h trend) 92 (+3) 69 (+3) 94 64
Wind 20ft/early(mph) E 17 E 20 E 19 E 19
Wind 20ft/late(mph) E 19 E 17 E 19 E 18
Mixing Hgt(ft-agl/msl) 4770 4490
Transport Wnd (mph) E 26 E 26
Vent Rate (kt-ft) 109710 103270
Dispersion 5 5
DSI 6 6 6 6
RH Recovery Excellent Excellent
Remarks...None.
$$