Weather in San Martín - 14-day forecast

Detailed weather forecast for San Martín, El Salvador: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in San Martín

today🌧️ 30°💧 6.4 mm

Sun🌧️ 30°💧 4.2 mm

Mon🌧️ 29°💧 42.2 mm

Tue🌧️ 30°💧 1 mm

Wed☁️ 32°💧 6.4 mm

Thu☁️ 29°💧 0.4 mm

Fri☁️ 32°💧 0.7 mm

Sat🌧️ 33°💧 0.2 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Wednesday 9 Sept in San Martín, the forecast high is 32°C. Typical daytime temperatures at this time of year range from 26°C to 30°C, so it will be exceptionally warm. It is warmer than 95% of similar days.

Saturday 5 Sept

30°Cwarmer than usual

usually 26°C–30°C

warmer than 81% of similar days

night: near normal rain: typical rainfall wind: exceptionally strong

Sunday 6 Sept

30°Cwarmer than usual

usually 27°C–30°C

warmer than 83% of similar days

night: warmer than usual rain: typical rainfall wind: stronger than usual

Monday 7 Sept

29°Cnear normal

usually 27°C–30°C

night: exceptionally cool rain: exceptionally wet wind: exceptionally strong

Tuesday 8 Sept

30°Cwarmer than usual

usually 27°C–30°C

warmer than 83% of similar days

night: exceptionally warm rain: less rain than usual wind: lighter than usual

Wednesday 9 Sept

32°Cexceptionally warm

usually 26°C–30°C

warmer than 95% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally light

Thursday 10 Sept

29°Cwarmer than usual

usually 26°C–30°C

warmer than 73% of similar days

night: exceptionally warm rain: less rain than usual wind: lighter than usual

Friday 11 Sept

32°Cexceptionally warm

usually 26°C–30°C

warmer than 95% of similar days

night: exceptionally warm rain: less rain than usual wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 29°C by day. The coolest year was 1999 (25°C) and the warmest was 1994 (36°C). The current forecast averages 31°C - higher than in 87% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - San Martín

San Martín - 14-day weather forecast infographic

San Martín 30 & 45-day weather - long-range outlook

Next 15 days · forecast

30°

around 22° at night · days with rain: 11

Weeks 3-4 · avg for September

29°

around 21° at night · rain chance 57%

Weeks 5-7 · avg for October

30°

around 21° at night · rain chance 46%

The 30 & 45-day outlook for San Martín: the next 15 days are a numerical forecast updated daily - on average 30° by day and 22° at night. Further out we rely on multi-year climate averages: around 29° in September, and about 30° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for San Martín

Saturday5 September 2026

🌧️30°light rain

sunrise 05:44 · sunset 18:04 · night 20° · evening 27° · rain 6.4 mm · humidity 49% · wind 4 m/s · clouds 99%

Sunday6 September 2026

🌧️30°moderate rain

sunrise 05:44 · sunset 18:04 · night 21° · evening 28° · rain 4.18 mm · humidity 50% · wind 3 m/s · clouds 96%

Monday7 September 2026

🌧️29°very heavy rain

sunrise 05:44 · sunset 18:03 · night 19° · evening 18° · rain 42.21 mm · humidity 64% · wind 5 m/s · clouds 46%

Tuesday8 September 2026

🌧️30°light rain

sunrise 05:44 · sunset 18:02 · night 23° · evening 25° · rain 0.99 mm · humidity 49% · wind 2 m/s · clouds 100%

Wednesday9 September 2026

☁️32°broken clouds

sunrise 05:44 · sunset 18:01 · night 23° · evening 24° · rain 6.42 mm · humidity 41% · wind 1 m/s · clouds 51%

Thursday10 September 2026

☁️29°overcast clouds

sunrise 05:44 · sunset 18:01 · night 24° · evening 26° · rain 0.42 mm · humidity 50% · wind 2 m/s · clouds 100%

Friday11 September 2026

☁️32°broken clouds

sunrise 05:44 · sunset 18:00 · night 22° · evening 24° · rain 0.72 mm · humidity 42% · wind 2 m/s · clouds 84%

Saturday12 September 2026

🌧️33°light rain

sunrise 05:44 · sunset 17:59 · night 23° · evening 25° · rain 0.18 mm · humidity 40% · wind 2 m/s · clouds 8%

Sunday13 September 2026

🌧️33°heavy rain

sunrise 05:44 · sunset 17:58 · night 21° · evening 21° · rain 39.03 mm · humidity 42% · wind 2 m/s · clouds 42%

Monday14 September 2026

🌧️32°moderate rain

sunrise 05:45 · sunset 17:58 · night 21° · evening 22° · rain 10.38 mm · humidity 48% · wind 2 m/s · clouds 24%

Tuesday15 September 2026

🌧️29°moderate rain

sunrise 05:45 · sunset 17:57 · night 21° · evening 22° · rain 18 mm · humidity 65% · wind 2 m/s · clouds 99%

Wednesday16 September 2026

🌧️28°heavy rain

sunrise 05:45 · sunset 17:56 · night 21° · evening 23° · rain 48.48 mm · humidity 67% · wind 2 m/s · clouds 100%

Thursday17 September 2026

🌧️26°moderate rain

sunrise 05:45 · sunset 17:56 · night 22° · evening 22° · rain 13.62 mm · humidity 79% · wind 2 m/s · clouds 100%

Friday18 September 2026

🌧️29°moderate rain

sunrise 05:45 · sunset 17:55 · night 22° · evening 23° · rain 13.74 mm · humidity 63% · wind 2 m/s · clouds 82%

Saturday19 September 2026

🌧️29°light rain

sunrise 05:45 · sunset 17:54 · night 21° · evening 22° · rain 3.33 mm · humidity 59% · wind 3 m/s · clouds 88%

UV index in San Martín - is it safe to sunbathe?

Today the UV index in San Martín is 9 (very high) - unprotected fair skin can burn in about 25 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

San Martín weather through the year

Warmest, driest months on average: January, February, April, November.

Upcoming public holidays in El Salvador: Independence Day — 15 September · All Souls' Day — 2 November · Christmas Day — 25 December.

Nearby and related places

CojutepequeSan VicenteIlopangoApopaZacatecolucaSan MiguelSanta AnaSanta Tecla

FAQ - San Martín weather

What is the weather like in San Martín today?

Today it is about 30° during the day and 20° at night, light rain.

How far ahead can I check the forecast for San Martín?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.