Climate Insights for Unión

Costa Rica

Hottest
September
27°C peak80°F peak
Coldest
February
17°C low63°F low
Wettest
October
499 mm rain19.6 in rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Unión is warm and mild. The average annual temperature is 22°C and approximately 3,055 mm of precipitation falls per year. Unión receives a notable amount of rainfall throughout the year, including during its driest month. Unión sits near the equator, so seasonal temperature differences are minimal throughout the year.The climate in Unión is warm and mild. The average annual temperature is 72°F and approximately 120.3 in of precipitation falls per year. Unión receives a notable amount of rainfall throughout the year, including during its driest month. Unión sits near the equator, so seasonal temperature differences are minimal throughout the year.

Temperature

0°5°10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecJanMax: 24°Average: 21°Min: 17°FebMax: 24°Average: 21°Min: 17°MarMax: 24°Average: 21°Min: 18°AprMax: 26°Average: 22°Min: 19°MayMax: 27°Average: 23°Min: 20°JunMax: 27°Average: 23°Min: 20°JulMax: 26°Average: 23°Min: 20°AugMax: 27°Average: 23°Min: 20°SepMax: 27°Average: 23°Min: 20°OctMax: 26°Average: 23°Min: 20°NovMax: 25°Average: 22°Min: 19°DecMax: 25°Average: 21°Min: 18°
Max
Average
Min
0°F10°F20°F30°F40°F50°F60°F70°F80°FJanFebMarAprMayJunJulAugSepOctNovDecJanMax: 75°FAverage: 69°FMin: 63°FFebMax: 75°FAverage: 69°FMin: 63°FMarMax: 76°FAverage: 70°FMin: 64°FAprMax: 78°FAverage: 72°FMin: 66°FMayMax: 80°FAverage: 73°FMin: 69°FJunMax: 80°FAverage: 73°FMin: 69°FJulMax: 79°FAverage: 73°FMin: 68°FAugMax: 80°FAverage: 73°FMin: 68°FSepMax: 80°FAverage: 73°FMin: 68°FOctMax: 79°FAverage: 73°FMin: 68°FNovMax: 78°FAverage: 72°FMin: 67°FDecMax: 76°FAverage: 70°FMin: 65°F
Max
Average
Min

Unión has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is September, when average highs reach 27°C and the mean temperature sits around 23°C. February is the coolest month, with minimum temperatures around 17°C and an average of 21°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows.Unión has relatively stable temperatures year-round, staying within a 17°F range. The warmest month is September, when average highs reach 80°F and the mean temperature sits around 73°F. February is the coolest month, with minimum temperatures around 63°F and an average of 69°F. Daily temperature variation is modest, with an average difference of 12°F between highs and lows.

Precipitation

0mm50mm100mm150mm200mm250mm300mm350mm400mm450mm500mmJanFebMarAprMayJunJulAugSepOctNovDecJanPrecipitation: 166mmFebPrecipitation: 162mmMarPrecipitation: 109mmAprPrecipitation: 140mmMayPrecipitation: 319mmJunPrecipitation: 293mmJulPrecipitation: 231mmAugPrecipitation: 214mmSepPrecipitation: 209mmOctPrecipitation: 499mmNovPrecipitation: 498mmDecPrecipitation: 216mm
Precipitation
0in2in4in6in8in10in12in14in16in18in20inJanFebMarAprMayJunJulAugSepOctNovDecJanPrecipitation: 6.5inFebPrecipitation: 6.4inMarPrecipitation: 4.3inAprPrecipitation: 5.5inMayPrecipitation: 12.6inJunPrecipitation: 11.6inJulPrecipitation: 9.1inAugPrecipitation: 8.4inSepPrecipitation: 8.2inOctPrecipitation: 19.6inNovPrecipitation: 19.6inDecPrecipitation: 8.5in
Precipitation

Unión is a very wet location, receiving approximately 3,055 mm of precipitation annually, which averages out to around 255 mm per month. The wettest month is October, averaging 499 mm of rainfall. November and May also tend to see above-average precipitation. The driest month is March, with just 109 mm. That's 390 mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.Unión is a very wet location, receiving approximately 120.3 in of precipitation annually, which averages out to around 10 in per month. The wettest month is October, averaging 19.6 in of rainfall. November and May also tend to see above-average precipitation. The driest month is March, with just 4.3 in. That's 15.4 in less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Wind

0km/h5km/hJanFebMarAprMayJunJulAugSepOctNovDecJanWind Speed: 5km/hFebWind Speed: 5km/hMarWind Speed: 5km/hAprWind Speed: 5km/hMayWind Speed: 4km/hJunWind Speed: 4km/hJulWind Speed: 4km/hAugWind Speed: 4km/hSepWind Speed: 4km/hOctWind Speed: 4km/hNovWind Speed: 4km/hDecWind Speed: 4km/h
Wind Speed
0mph5mphJanFebMarAprMayJunJulAugSepOctNovDecJanWind Speed: 3mphFebWind Speed: 3mphMarWind Speed: 3mphAprWind Speed: 3mphMayWind Speed: 2mphJunWind Speed: 2mphJulWind Speed: 2mphAugWind Speed: 2mphSepWind Speed: 2mphOctWind Speed: 2mphNovWind Speed: 2mphDecWind Speed: 3mph
Wind Speed

Unión is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.Unión is relatively calm, with an average annual wind speed of 3mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is March, averaging 3mph, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 2mph, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1mph between the calmest and windiest months.

Monthly Climate Data

The table below shows monthly climate averages for Unión based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.The table below shows monthly climate averages for Unión based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Fahrenheit (°F). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in miles per hour (mph). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
17 °C63 °F
24 °C75 °F
5 km/h3 mph
166 mm6.5 in
0 cm0 in
Feb
17 °C63 °F
24 °C75 °F
5 km/h3 mph
162 mm6.4 in
0 cm0 in
Mar
18 °C64 °F
24 °C76 °F
5 km/h3 mph
109 mm4.3 in
0 cm0 in
Apr
19 °C66 °F
26 °C78 °F
5 km/h3 mph
140 mm5.5 in
0 cm0 in
May
20 °C69 °F
27 °C80 °F
4 km/h2 mph
319 mm12.6 in
0 cm0 in
Jun
20 °C69 °F
27 °C80 °F
4 km/h2 mph
293 mm11.6 in
0 cm0 in
Jul
20 °C68 °F
26 °C79 °F
4 km/h2 mph
231 mm9.1 in
0 cm0 in
Aug
20 °C68 °F
27 °C80 °F
4 km/h2 mph
214 mm8.4 in
0 cm0 in
Sep
20 °C68 °F
27 °C80 °F
4 km/h2 mph
209 mm8.2 in
0 cm0 in
OctCurrent
20 °C68 °F
26 °C79 °F
4 km/h2 mph
499 mm19.6 in
0 cm0 in
Nov
19 °C67 °F
25 °C78 °F
4 km/h2 mph
498 mm19.6 in
0 cm0 in
Dec
18 °C65 °F
25 °C76 °F
4 km/h3 mph
216 mm8.5 in
0 cm0 in