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Weather in Alajuela - 14-day forecast

Detailed weather forecast for Alajuela, Costa Rica: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Alajuela
today🌧️ 26°💧 6.8 mm
Sun🌧️ 29°💧 12 mm
Mon🌧️ 22°💧 13.5 mm
Tue🌧️ 30°💧 3.6 mm
Wed🌧️ 28°💧 1.7 mm
Thu🌧️ 30°💧 1.9 mm
Fri🌧️ 27°💧 4.3 mm
Sat🌧️ 27°💧 10.3 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

Monday 7 Sept in Alajuela, the forecast high is 22°C. Typical daytime temperatures at this time of year range from 25°C to 28°C, so it will be exceptionally cool. It is cooler than 99% of similar days.

26°Ccooler than usual
usually 25°C–28°C
cooler than 72% of similar days
night: exceptionally warm rain: typical rainfall wind: stronger than usual
29°Cwarmer than usual
usually 25°C–28°C
warmer than 87% of similar days
night: exceptionally cool rain: more rain than usual wind: stronger than usual
22°Cexceptionally cool
usually 25°C–28°C
cooler than 99% of similar days
night: cooler than usual rain: more rain than usual wind: stronger than usual
30°Cexceptionally warm
usually 25°C–28°C
warmer than 94% of similar days
night: near normal rain: typical rainfall wind: exceptionally strong
28°Cwarmer than usual
usually 25°C–28°C
warmer than 83% of similar days
night: cooler than usual rain: less rain than usual wind: exceptionally strong
30°Cexceptionally warm
usually 25°C–28°C
warmer than 96% of similar days
night: cooler than usual rain: less rain than usual wind: exceptionally strong
27°Cwarmer than usual
usually 25°C–28°C
warmer than 73% of similar days
night: near normal rain: typical rainfall wind: stronger than usual

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 →
20°28°35° 1981: 26°C1982: 29°C1983: 28°C1984: 26°C1985: 27°C1986: 27°C1987: 27°C1988: 25°C1989: 26°C1990: 29°C1991: 29°C1992: 28°C1993: 26°C1994: 31°C1995: 26°C1996: 26°C1997: 28°C1998: 25°C1999: 25°C2000: 25°C2001: 27°C2002: 27°C2003: 28°C2004: 26°C2005: 27°C2006: 27°C2007: 26°C2008: 27°C2009: 29°C2010: 26°C2011: 26°C2012: 27°C2013: 25°C2014: 26°C2015: 28°C2016: 26°C2017: 26°C2018: 26°C2019: 28°C2020: 27°C2021: 25°C2022: 26°C2023: 29°C2024: 27°C2025: 27°C 2026 forecast: 28°C current forecast 28°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 27°C by day. The coolest year was 1988 (25°C) and the warmest was 1994 (31°C). The current forecast averages 28°C - higher than in 76% 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 - Alajuela

Alajuela - 14-day weather forecast infographic

Alajuela 30 & 45-day weather - long-range outlook

Next 15 days · forecast
27°
around 21° at night · days with rain: 15
Weeks 3-4 · avg for September
27°
around 19° at night · rain chance 85%
Weeks 5-7 · avg for October
27°
around 19° at night · rain chance 81%
The 30 & 45-day outlook for Alajuela: the next 15 days are a numerical forecast updated daily - on average 27° by day and 21° at night. Further out we rely on multi-year climate averages: around 27° in September, and about 27° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Alajuela

Saturday5 September 2026
🌧️26°moderate rain
sunrise 05:27 · sunset 17:44 · night 22° · evening 25° · rain 6.8 mm · humidity 61% · wind 2 m/s · clouds 100%
Sunday6 September 2026
🌧️29°moderate rain
sunrise 05:27 · sunset 17:43 · night 19° · evening 23° · rain 12.02 mm · humidity 56% · wind 2 m/s · clouds 86%
Monday7 September 2026
🌧️22°moderate rain
sunrise 05:27 · sunset 17:42 · night 20° · evening 21° · rain 13.52 mm · humidity 90% · wind 2 m/s · clouds 90%
Tuesday8 September 2026
🌧️30°light rain
sunrise 05:27 · sunset 17:42 · night 21° · evening 21° · rain 3.59 mm · humidity 51% · wind 3 m/s · clouds 99%
Wednesday9 September 2026
🌧️28°light rain
sunrise 05:27 · sunset 17:41 · night 20° · evening 22° · rain 1.65 mm · humidity 53% · wind 4 m/s · clouds 88%
Thursday10 September 2026
🌧️30°light rain
sunrise 05:27 · sunset 17:41 · night 20° · evening 22° · rain 1.86 mm · humidity 44% · wind 3 m/s · clouds 87%
Friday11 September 2026
🌧️27°light rain
sunrise 05:27 · sunset 17:40 · night 20° · evening 22° · rain 4.32 mm · humidity 58% · wind 2 m/s · clouds 34%
Saturday12 September 2026
🌧️27°moderate rain
sunrise 05:27 · sunset 17:39 · night 20° · evening 21° · rain 10.29 mm · humidity 68% · wind 2 m/s · clouds 65%
Sunday13 September 2026
🌧️26°moderate rain
sunrise 05:27 · sunset 17:39 · night 21° · evening 21° · rain 16.02 mm · humidity 73% · wind 2 m/s · clouds 100%
Monday14 September 2026
🌧️25°heavy rain
sunrise 05:27 · sunset 17:38 · night 21° · evening 21° · rain 49.98 mm · humidity 74% · wind 2 m/s · clouds 95%
Tuesday15 September 2026
🌧️28°heavy rain
sunrise 05:27 · sunset 17:37 · night 21° · evening 21° · rain 32.85 mm · humidity 65% · wind 2 m/s · clouds 92%
Wednesday16 September 2026
🌧️26°moderate rain
sunrise 05:27 · sunset 17:37 · night 21° · evening 21° · rain 16.8 mm · humidity 73% · wind 2 m/s · clouds 61%
Thursday17 September 2026
🌧️25°moderate rain
sunrise 05:26 · sunset 17:36 · night 20° · evening 21° · rain 21.51 mm · humidity 80% · wind 2 m/s · clouds 50%
Friday18 September 2026
🌧️28°moderate rain
sunrise 05:26 · sunset 17:35 · night 21° · evening 22° · rain 7.89 mm · humidity 66% · wind 2 m/s · clouds 92%
Saturday19 September 2026
🌧️25°moderate rain
sunrise 05:26 · sunset 17:35 · night 21° · evening 21° · rain 22.17 mm · humidity 81% · wind 2 m/s · clouds 92%

UV index in Alajuela - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTAlajuela03681111+6.7UV HIGHtoday, daily maxSPF 30-50, a hat and sunglasses are a must. Betterstay in shade between 11:00 and 15:00.Unprotected fair skin may burn in about 30 min7Sat5.099Sun6.095Mon7.099Tue8.099Wed9.098Thu10.097Fri11.099Sat12.099Sun13.097Mon14.099Tue15.098Wed16.095Thu17.099Fri18.097Sat19.096Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Alajuela is 7 (high) - unprotected fair skin can burn in about 30 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.

Alajuela weather through the year

Alajuela - annual climate
Upcoming public holidays in Costa Rica: Independence Day — 15 September · Army Abolition Day — 1 December · Christmas Day — 25 December.

Nearby and related places

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FAQ - Alajuela weather

What is the weather like in Alajuela today?
Today it is about 26° during the day and 22° at night, moderate rain.
How far ahead can I check the forecast for Alajuela?
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.