Today
3 Nov
88° 79°
56%0.07 in
43%
9 weather models · one stack
San Juan weather
San Juan, PR
18.45°, -66.14° · 14 m
Local time 21:17
Confidence 43%
San Juan weather today: 9 models agree with low confidence on a high of 88°F and a low of 79°F. Rain expected: 56% of models agree, about 0.07 in. Tomorrow: 89°F. Rain expected: 78% of models agree, about 0.15 in.
The stack
Each row is one weather model, each cell one hour. Same colour across rows = the models agree. Tap a model to hide it; hover for exact values.
16-day consensus
Each coloured line is one model's low→high; the dots are their highs. A tight cluster means a confident forecast.
Wed
4 Nov
89° 79°
78%0.15 in
61%
Thu
5 Nov
87° 78°
100%0.25 in
78%
Fri
6 Nov
84° 77°
89%0.39 in
73%
Sat
7 Nov
86° 77°
78%0.32 in
65%
Sun
8 Nov
86° 77°
71%0.08 in
65%
Mon
9 Nov
86° 77°
71%0.09 in
66%
Tue
10 Nov
86° 78°
83%0.21 in
73%
Wed
11 Nov
87° 76°
40%0.00 in
40%
Thu
12 Nov
89° 78°
0%0.02 in
75%
Fri
13 Nov
88° 79°
25%0.03 in
54%
Sat
14 Nov
88° 78°
33%0.02 in
55%
Sun
15 Nov
88° 78°
67%0.07 in
47%
Mon
16 Nov
88° 76°
67%0.05 in
43%
Tue
17 Nov
86° 76°
67%0.13 in
48%
Wed
18 Nov
86° 76°
100%0.20 in
69%
Model spaghetti
Every model as a line, the bold line is the median, the shaded band the full model range. Rain shows accumulated totals from now.
Model maps around San Juan
ECMWF and GFS rain forecasts over San Juan on synced maps. Drag the divider or press play.
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What each model says for San Juan
Daily high/low and rain total per model. Blue = at least 1 mm.
| Model | Today | Wed 4 | Thu 5 | Fri 6 | Sat 7 | Sun 8 | Mon 9 |
|---|---|---|---|---|---|---|---|
| Consensus | 88°/79° · 0.07 in | 89°/79° · 0.15 in | 87°/78° · 0.25 in | 84°/77° · 0.39 in | 86°/77° · 0.32 in | 86°/77° · 0.08 in | 86°/77° · 0.09 in |
| ECMWF | 87°/77° · 0.23 in | 85°/77° · 0.09 in | 84°/77° · 0.15 in | 81°/76° · 0.43 in | 83°/76° · 0.52 in | 84°/77° · 0.01 in | 84°/76° · 0.08 in |
| AIFS | 88°/80° · 0.07 in | 89°/79° · 0.09 in | 87°/78° · 0.25 in | 83°/77° · 0.54 in | 84°/77° · 0.48 in | 85°/77° · 0.19 in | 86°/77° · 0.14 in |
| GFS | 92°/76° · 0.32 in | 89°/76° · 0.02 in | 88°/76° · 0.22 in | 87°/75° · 0.26 in | 88°/75° · 0.24 in | 87°/75° · 0.18 in | 86°/76° · 0.02 in |
| ICON | 91°/79° · 0.02 in | 89°/79° · 0.03 in | 89°/79° · 0.09 in | 87°/79° · 0.33 in | 87°/78° · 0.01 in | 86°/79° · 0.08 in | 86°/79° · 0.15 in |
| GEM | 91°/76° · 0.19 in | 89°/76° · 0.54 in | 83°/74° · 0.07 in | 85°/75° · <0.01 in | 87°/76° · 0.00 in | 87°/76° · 0.21 in | 86°/77° · 0.00 in |
| JMA | 86°/80° · 0.00 in | 85°/80° · 0.19 in | 84°/79° · 0.48 in | 82°/79° · 0.69 in | 84°/79° · 0.34 in | 85°/80° · 0.02 in | 86°/80° · 0.09 in |
| ARPEGE | 87°/81° · 0.02 in | 83°/80° · 0.15 in | 84°/78° · 0.38 in | 83°/80° · 0.39 in | 83°/80° · 0.07 in | - | - |
| UKMO | 89°/81° · 0.00 in | 90°/80° · 0.18 in | 90°/79° · 0.27 in | 84°/79° · 1.02 in | 86°/79° · 0.89 in | 87°/78° · 0.06 in | 87°/79° · 0.31 in |
| CMA | 88°/75° · 0.28 in | 88°/76° · 0.39 in | 87°/76° · 0.30 in | 84°/76° · 0.25 in | 87°/76° · 0.32 in | - | - |
Where the models disagree: Tuesday
Confidence is only 43/100. GFS brings 0.32 in of rain while JMA has 0.00 in; highs range from 86° (JMA) to 92° (GFS). Check back: the next model runs will usually narrow this down.
San Juan weather: questions
Will it rain in San Juan tomorrow?
Rain expected: 78% of models agree, about 0.15 in. Across 9 weather models the median total is 0.15 in, ranging from 0.02 in to 0.54 in.
When will it rain next in San Juan?
The next day most models agree on rain is Tuesday 3 November: 56% of models, about 0.07 in.
What do ECMWF and GFS say for San Juan today?
ECMWF (the European model) forecasts a high of 87°F with 0.23 in of rain; GFS (the American model) says 92°F with 0.32 in. The median of all 9 models is 88°F.
Which weather model is most accurate for San Juan?
On average ECMWF scores best in global verification beyond 2–3 days, with the UK Met Office close behind. For the first 48 hours, high-resolution regional models (ICON-D2, AROME, HRRR, UKV) often win locally. The most reliable single number is usually the multi-model consensus shown on this page.
How reliable is the San Juan forecast this week?
The least certain day is Tuesday (confidence 43/100): GFS forecasts 0.32 in of rain while JMA forecasts 0.00 in.
Nearby forecasts
Model runs fetched at 01:17 UTC. Sources: ECMWF IFS · ECMWF AIFS · NOAA GFS · DWD ICON · Canadian GEM · JMA GSM · Météo-France ARPEGE / AROME · UK Met Office · CMA GRAPES · Methodology