San Juan Veður Spá
San Juan weather: 26°C, skýjað. Á klukkustund forecast, 14-day outlook, UV, air quality and the best time til visit.
Will it rain in San Juan?
Yes - rain is likely in San Juan today.
A 100% chance means rain is expected over most of the area. Plan indoor alternatives.
Over the next 7 days, about 31 mm of precipitation is forecast, með the wettest days falling on fim., lau., sun., mán., þri. and mið..
Rigningfall over the next 7 days is close til normal for september (31 mm against a typical 23 mm).
16-day forecast for San Juan
Hæst / Lægst; Úrkoma; UV
| Dagur | Aðstæður | Hæst / Lægst | Úrkoma | Vindur | UV |
|---|---|---|---|---|---|
| fim., sep 17 | ⛈️ Þrumuveður | 28° / 26° | 100% · 8 mm | 29 km/h | 8 |
| fös., sep 18 | ☁️ Skýjað | 30° / 26° | 16% | 27 km/h | 8 |
| lau., sep 19 | 🌦️ Light showers | 29° / 26° | 82% · 4 mm | 24 km/h | 8 |
| sun., sep 20 | ⛈️ Þrumuveður | 29° / 25° | 74% · 4 mm | 21 km/h | 8 |
| mán., sep 21 | ⛈️ Þrumuveður | 29° / 25° | 76% · 4 mm | 22 km/h | 8 |
| þri., sep 22 | ⛈️ Þrumuveður | 29° / 25° | 93% · 6 mm | 19 km/h | 9 |
| mið., sep 23 | ⛈️ Þrumuveður | 27° / 25° | 98% · 6 mm | 21 km/h | 8 |
| fim., sep 24 | 🌦️ Light drizzle | 30° / 25° | 68% · 0 mm | 23 km/h | 8 |
| fös., sep 25 | 🌦️ Light drizzle | 30° / 26° | 49% · 1 mm | 25 km/h | 7 |
| lau., sep 26 | 🌤️ Að mestu heiðskýrt | 29° / 27° | 52% | 27 km/h | 9 |
| sun., sep 27 | ☀️ Heiðskýrt | 29° / 25° | 69% | 27 km/h | 8 |
| mán., sep 28 | 🌦️ Light drizzle | 29° / 26° | 70% · 1 mm | 21 km/h | 8 |
| þri., sep 29 | ⛅ Skýjað að hluta | 29° / 26° | 76% | 16 km/h | 8 |
| mið., sep 30 | 🌦️ Drizzle | 29° / 25° | 63% · 4 mm | 22 km/h | 8 |
| fim., okt 1 | 🌦️ Light drizzle | 34° / 25° | 58% · 2 mm | 23 km/h | 8 |
| fös., okt 2 | ☀️ Heiðskýrt | -- / -- | 48% | -- | — |
What this means for San Juan
Today is slightly cooler than average for september. The forecast high of 28°C is 2.5°C below the 30°C typical for this month.
A 100% chance means rain is expected over most of the area. Plan indoor alternatives.
Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in júní til ágúst.
The gap between the warmest and coldest month averages 3°C - an unusually even climate through the year.
What til pack, what til skip
- Lightweight, light-coloured clothing and a refillable water bottle
- sun.glasses, a brimmed hat and SPF 30+
- A packable rain shell - 6 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid febrúar, október and nóvember - historically the least comfortable months here.
Sjá spá fyrir San Juan eftir tímabili
San Juan weather - more answers
Explore San Juan
Every topic we hold for this place, and the same topic for the places around it.
Veður for related places
Frequently asked questions
Where is San Juan?
San Juan is a city in Púertó Ríkó. Its coordinates are 18.4655, -66.1057. It lies in Norður-Ameríka.
What is the weather like in San Juan núna?
It is currently 26°C (80°F) með skýjað. Raki is 87% and wind is 13 km/h.
When is the best time til visit San Juan?
janúar, mars, maí, júní, júlí, ágúst and desember offer the most comfortable conditions in San Juan, which has a temperate climate. febrúar, október and nóvember are usually the hardest months for outdoor plans.
What time zone is San Juan in?
San Juan observes America/Puerto_Rico (UTC-04:00). The local time is 1:18 AM.
How many people live in San Juan?
San Juan has a population of approximately 340.000.
What are the top things til do in San Juan?
Popular options include Virgin Islands National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (cities-world) - coordinates, hierarchy and facts. |
|---|---|
| Spá and observations | Open-Meteo (ECMWF and national models). |
| Loftgæði and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Loftslag averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Veður Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated september 17, 2026 at 1:18 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
