Nosara weather in August
August in Nosara: sweltering, soaked, with clean air — a gamble, with 30 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#8 of 12 months in Nosara · #1051 of 1413 destinations to visit in August · comfort 62/100 (tier C)
- Days
- 30°C
- Nights
- 25°C
- Wet days
- 30
- Sun
- 8.8 h
- Humidity
- 89%
- Daylight
- 12 h

Traveller notes on Nosara in August
Notes from nearby Santa Teresa (65 km away)
Nosara doesn't have its own notes for August yet — these are about Santa Teresa, close enough to share the season.
Santa Teresa forum threads describe August as genuinely rainy country-wide, with the typical pattern being sunny mornings, a real chance of afternoon rain, and possibly wet overnight stretches too - posters called mid-August 'nice and wet' rather than a washout. The consistent advice was to front-load activities for the morning and treat the area as a place to slow down and relax in the afternoons. Multiple threads flagged that the heaviest rainy season here doesn't really start until the very end of August into September/October, when some restaurants and hotels close for the slow season, meaning earlier August still runs noticeably better than what follows it.
Other months in Nosara
Regulars are specific it genuinely rains most days here this month, though showers typically stay brief, around 15 minutes, sandwiched between mostly sunny, hot mornings and afternoons and a cooler evening. Our row backs that hot, genuinely wet read, 29.9C reading as a scorching 37C, over 25.2C nights feeling 31C, with a substantial 321.2mm of rain across 27.9 days and humidity at 88 percent. Regulars are consistent long-term residents specifically call this arguably the best time of year on the Pacific coast despite the daily rain, the Guanacaste region itself running meaningfully drier than the rest of Costa Rica, surfing and diving trips still genuinely doable around the showers. The sea sits at a bath-warm 30.2C. The record: 9.2 hours of sun, a 9.7 kph wind and AQI 24.
November here is the rainy season's last real month, and regulars describe a specific daily shape to it: clear days with thunderstorms arriving reliably around six each evening, rather than rain spread evenly through the day. Our row carries the season's tail at 280.2mm across 25.5 days, still substantial, at 87.6 percent humidity - air reads 29.1C but as a real 35C, over 24.6C nights. The board's honest caveat is that Costa Rica has a dozen microclimates, so rain elsewhere on a given day says little about here. A four-wheel-drive is worth having for the last of the season's soft roads. The foliage is at its greenest now, before the dry months bleach it back. The sea is 28.7C. The record: 9.1 hours of sun, a 10.8 kph wind and one of this project's cleanest air readings at AQI 22.
April is the end of the dry season here and regulars rate it: much drier than May or June, if not quite as dry as February and March. Our row looks like a flat contradiction at 126.2mm across 19.2 precipitation days - until the second half of their answer, which is that the first rains usually begin later in the month. The monthly total is back-loaded, so early April is the dry part and the average is really two different halves added together. Heat is what they actually warn about: hot, hotter, and sand too hot to cross barefoot between the chair and the water. Our 32.8C over 25.8C nights reads as 39C and 30C. The record: humidity 75 percent, 11 hours of sun, a 30C sea and AQI 33.
The rains usually finish in November, so December catches Guanacaste in its best state - dry, but with the foliage still green before the long brown months set in. Our row is a shade wetter than the regulars' 'very little to no rain', at 64.3mm across 10.6 precipitation days, which is the turn rather than the dry season proper. December to March is also when North Americans arrive to escape their winter, so the town fills. For surfers the draw is consistency: Playa Guiones is among the most reliable breaks in the country and a typical season runs knee to head high from November to March, which is why the surf and yoga crowd is here now. The sea is 28.9C. The record: 30.5C reading as 36C, 24.5C nights, 10.3 hours of sun and AQI 24.
Add your own note from Nosara's card on the map.
Nosara climate normals — August
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Nosara in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Nosara's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherNosara's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Nosara in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
South swell season
1 Apr – 31 Oct · usuallySurf seasonSouthern swells run through the middle of the year and Guiones holds them right through the tide, which is why the surf schools never shut. Offshore mornings, onshore by lunch.
- Season
Green season
1 May – 15 Nov · usuallyMonsoonRain in the late afternoon, rates down by a third, and the dirt roads out to Ostional and Samara wanting clearance. The forest is loud again and the howlers are back on the wires at dawn.
- Nature
Arribada at Ostional
1 Jul – 31 Dec · usuallyTurtle nestingBook earlyOstional, ten minutes up the coast, takes mass arrivals of olive ridleys most months from July, usually a few days after the last-quarter moon and heaviest from September to November. You go with a village guide or not at all. Source ↗
- Season
Wet season
MonsoonRisk30 rainy days and about 400 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Nosara — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Nosara?
Nosara in August — FAQ
- Is August a good time to visit Nosara?
- August in Nosara: sweltering, soaked, with clean air — a gamble, with 30 rainy days. It ranks #8 of 12 months for Nosara on SeasonMap's comfort score (62/100).
- What is the weather like in Nosara in August?
- In August, Nosara averages a daily high of 29.7°C and a low of 25.1°C, with about 399.6 mm of rain over roughly 30 rainy days.
- What is the air quality in Nosara in August?
- Nosara has a mean US Air Quality Index of about 24 in August.
Within 300 km: Jacó's Humpback whales around 15 Jul – 15 Nov, and Tortuguero's Green turtle nesting on 1 Jul – 31 Oct.