Guanacaste Province (Guanacaste)
September
Weather in Guanacaste Province for September 2026
Your guide to Guanacaste Province weather in September - trends and predictions
So far, September 2026 in Guanacaste Province shows a warmer trend than usual by 4 °C.
The forecast for the next days in Guanacaste Province predicts temperatures to be around 31 °C, close to the historical average.
In general, the average temperature in Guanacaste Province at the beginning of September is 31.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 28 °C by the end of September.
Guanacaste Province experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 451.2 mm.
Temperatures
Rain 🌧️
0
Dry days
30
Rainy days
0
Snow days
28°/22°
Temperatures
10 km/h
Avg max wind
86 %
Avg humidity
Guanacaste Province Weather September
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What’s the Weather Like in Guanacaste Province This September?
Discover the average temperatures and weather trends across Guanacaste Province’s cities this September.
Temperatures trend during September in Guanacaste Province
See the weather trend as well as the moving average line
September weather in Guanacaste Province day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Moderate or heavy rain shower | 32° /23° | 7.6 mm | 5 | |
| 2 Sept. | Moderate or heavy rain shower | 32° /22° | 14.8 mm | 6 | |
| 3 Sept. | Moderate or heavy rain shower | 31° /23° | 10.6 mm | 6 | |
| 4 Sept. | Moderate or heavy rain shower | 32° /23° | 5.7 mm | 8 | |
| 5 Sept. | Moderate or heavy rain shower | 31° /23° | 9.1 mm | 5 | |
| 6 Sept. | Moderate or heavy rain shower | 30° /23° | 9.4 mm | 5 | |
| 7 Sept. | Moderate or heavy rain shower | 30° /22° | 34.6 mm | 5 | |
| 8 Sept. | Moderate or heavy rain shower | 30° /22° | 11.5 mm | 7 | |
| 9 Sept. |  Patchy rain possible | 31° /23° | 9 mm | 8 | |
| 10 Sept. |  Heavy rain at times | 32° /23° | 6 mm | 5 | |
| 11 Sept. | Moderate or heavy rain shower | 32° /23° | 8.7 mm | 5 | |
| 12 Sept. | Moderate or heavy rain shower | 32° /23° | 5.8 mm | 8 | |
| 13 Sept. | Moderate or heavy rain shower | 31° /22° | 22.7 mm | 5 | |
| 14 Sept. | Moderate or heavy rain shower | 31° /23° | 8.8 mm | 5 | |
| 15 Sept. | Moderate or heavy rain shower | 30° /23° | 12.4 mm | 5 | |
| 16 Sept. |  Overcast | 35° /24° | 0 mm | 11.5 | |
| 17 Sept. | Overcast | 37° /24° | 0.1 mm | 10.9 | |
| 18 Sept. | Overcast | 35° /24° | 0.3 mm | 11.2 | |
| 19 Sept. |  Sunny | 37° /24° | 2.1 mm | 10.5 | |
| 20 Sept. | Light rain shower | 36° /24° | 9.7 mm | 8 | |
| 21 Sept. | Light rain shower | 29° /23° | 13 mm | 6 | |
| 22 Sept. | Light rain shower | 25° /23° | 14.9 mm | 5 | |
| 23 Sept. | Light rain shower | 29° /23° | 14 mm | 6 | |
| 24 Sept. | Light rain shower | 31° /23° | 21.2 mm | 7 | |
| 25 Sept. |  Mist | 27° /22° | 81.3 mm | 6 | |
| 26 Sept. | Overcast | 26° /22° | 13.9 mm | 6 | |
| 27 Sept. | Overcast | 28° /23° | 6.5 mm | 6 | |
| 28 Sept. | Overcast | 28° /23° | 4.2 mm | 6 | |
| 29 Sept. | Light rain shower | 28° /23° | 18.9 mm | 6 | |
| 30 Sept. | Light rain shower | 28° /22° | 16.8 mm | 6 | |
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Important Notice
Our weather forecast for Guanacaste Province in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Guanacaste Province forecast closer to your planned date for the most up-to-date weather information.
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Guanacaste Province in September - FAQ
What are the expected maximum and minimum temperatures in Guanacaste Province during September?
During September, expect a variety of temperatures with highs around 28° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Guanacaste Province during September?
Significant rainfall exceeding 451.2 mm is expected in Guanacaste Province during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Guanacaste Province during September?
The average wind speed in Guanacaste Province during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Guanacaste Province
Explore the daily rainfall trends and prepare for Guanacaste Provinces September weather 💧
Typically, Guanacaste Province has 30 rainy days in September with a total of 451.2 mm of rainfall.
UV exposure in Guanacaste Province during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Guanacaste Province?Get accurate weather forecasts for Guanacaste Province, located at latitude 10.767 and longitude -85.647. Stay updated with localized weather information tailored for Guanacaste Province.
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