Guanacaste Province (Liberia)
September
Weather in Guanacaste Province for September 2025
Your guide to Guanacaste Province weather in September - trends and predictions
In general, the average temperature in Guanacaste Province at the beginning of September is 29.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 28.4 °C by the end of September.
Guanacaste Province experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
Is September a good time to visit Guanacaste Province? check out the best time to travel to Guanacaste Province page.
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Temperatures
Rain 🌧️
More
3
Dry days
27
Rainy days
0
Snow days
31°/23°
Temperatures
10 km/h
Avg max wind
85 %
Avg humidity
Guanacaste Province in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  29° | 3  30° | 4 29° | 5 30° | 6 29° | 7  30° |
| 8 28° | 9 29° | 10 31° | 11 30° | 12 30° | 13  31° | 14  31° |
| 15 30° | 16 30° | 17 30° | 18 30° | 19 30° | 20 28° | 21 29° |
| 22 28° | 23 29° | 24 29° | 25 28° | 26 29° | 27 27° | 28 29° |
| 29 28° | 30 29° |
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Temperatures trend during September in Guanacaste Province
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy light rain with thunder | 30° /23° | 15.7 mm | 7 | |
| 2 Sept. | Moderate or heavy rain shower | 29° /22° | 26.6 mm | 7 | |
| 3 Sept. | Patchy rain possible | 30° /23° | 9.4 mm | 7 | |
| 4 Sept. | Moderate or heavy rain shower | 29° /22° | 12.5 mm | 6 | |
| 5 Sept. | Moderate or heavy rain shower | 30° /23° | 16.4 mm | 7 | |
| 6 Sept. | Patchy light rain with thunder | 29° /23° | 26.5 mm | 7 | |
| 7 Sept. | Torrential rain shower | 30° /23° | 56.6 mm | 7 | |
| 8 Sept. | Moderate or heavy rain shower | 28° /22° | 4.2 mm | 7 | |
| 9 Sept. | Torrential rain shower | 29° /23° | 15.6 mm | 7 | |
| 10 Sept. | Patchy rain possible | 31° /23° | 5.2 mm | 7 | |
| 11 Sept. | Moderate or heavy rain shower | 30° /23° | 14.9 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 30° /23° | 9.9 mm | 7 | |
| 13 Sept. | Partly cloudy | 31° /23° | 5.4 mm | 7 | |
| 14 Sept. | Cloudy | 31° /23° | 2.6 mm | 7 | |
| 15 Sept. | Partly cloudy | 30° /22° | 3.6 mm | 8 | |
| 16 Sept. | Light rain shower | 30° /23° | 5.4 mm | 7 | |
| 17 Sept. | Light rain shower | 30° /23° | 12.1 mm | 7 | |
| 18 Sept. | Light rain shower | 30° /22° | 13 mm | 7 | |
| 19 Sept. | Light rain shower | 30° /23° | 14.6 mm | 7 | |
| 20 Sept. | Moderate or heavy rain shower | 28° /23° | 14.2 mm | 7 | |
| 21 Sept. | Light rain shower | 29° /22° | 16.9 mm | 7 | |
| 22 Sept. | Light rain shower | 28° /23° | 18.9 mm | 7 | |
| 23 Sept. | Light rain shower | 29° /22° | 8.9 mm | 7 | |
| 24 Sept. | Patchy rain possible | 29° /22° | 10 mm | 7 | |
| 25 Sept. | Patchy light rain with thunder | 28° /22° | 38.2 mm | 6 | |
| 26 Sept. | Moderate or heavy rain shower | 29° /22° | 8.6 mm | 7 | |
| 27 Sept. | Moderate or heavy rain shower | 27° /22° | 24.3 mm | 6 | |
| 28 Sept. | Patchy light rain with thunder | 29° /23° | 8.7 mm | 7 | |
| 29 Sept. | Moderate or heavy rain shower | 28° /23° | 15.5 mm | 6 | |
| 30 Sept. | Light rain shower | 29° /22° | 8.2 mm | 7 | |
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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.
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 31° and lows near 23°, suitable for diverse activities and preferences.
How much rainfall should be expected in Guanacaste Province during September?
Significant rainfall exceeding 885 mm is expected in Guanacaste Province during September, occurring over more than 27 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.
What to pack to Guanacaste Province in September?
As you prepare for your trip to Guanacaste Province in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Guanacaste Province, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
September rainfall patterns in Guanacaste Province
Explore the daily rainfall trends and prepare for Guanacaste Provinces September weather 💧
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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