Santa Catarina Forecast: Warm Sunny Weekend with Isolated Afternoon Showers

Breaking: Sunny Weekend in Santa Catarina With isolated Afternoon Showers,Then Heat Returns

Forecasts show a radiant weekend across Santa Catarina,with daytime sun and heat giving way to isolated showers in the afternoons. Forecasters warn that thunderstorms, heavy at times, could bring hail and gusty winds, especially in the western regions, valleys, and northern zones. Coastal areas, simultaneously occurring, will experience maritime moisture pushing into the afternoon hours.

Saturday, January 3

Tempo: Expect sunny skies and hot conditions in most of the state, with passing, isolated rain showers in the afternoon. Thunderstorms are possible, bringing lightning and a chance of hail, notably in the west, valley, and northern sectors.

Temperatures: Highs range from 33°C to 34°C in the west, and up to 35°C–37°C in the east, with muggy air prevailing.

Wind: northwest to southwest winds shifting to south or southeast, with stronger gusts near storms, especially along the coast.

System: A hot air mass remains over the state, fueling local instability in the heat of the afternoon.

sunday, January 4

Tempo: A mix of sun and clouds, with increasing cloudiness along the coast from the afternoon onward due to maritime circulation. Rain is likely at night on the North Coast.

Temperatures: Cooler than Saturday, with highs of 25°C to 32°C in most of the state.On higher terrain of the Southern Plateau, night-time lows may dip to 2°C–5°C, with a risk of a light frost in some areas.

Wind: Winds swing from south to southeast, generally light to moderate.

System: A high-pressure system over Uruguay and rio Grande do Sul keeps interior air dry, while moisture from the sea feeds coastal showers.

Monday, January 5

Tempo: The west should see more sun, while the plateau through the coast features more cloud cover and a chance of rain at night, driven by a dry air mass lingering across the region.

Temperatures: The cool start on the Southern Plateau gives way to a comfortable afternoon with highs of 24°C to 27°C. Nighttime lows hover around 3°C to 5°C in higher areas.

Wind: South to southeast winds remain light to moderate, with coastal gusts possible.

Tuesday, January 6

Tempo: A mix of sun and many clouds across all regions, with light rain at the start and end of the day in greater Florianópolis and areas to the north.

Temperatures: Elevation will influence readings, with daytime highs from 27°C to 32°C.

Wind: An east breeze in the morning shifting to northeast later, generally weak to moderate.

Wednesday, January 7

Tempo: Sunny early, followed by increasing cloud cover. Rain is possible in the morning in Greater Florianópolis to the north, then widespread rain from the afternoon, with moderate to heavy activity from the Far West to the south Coast.

Temperatures: A hot day is anticipated, with maximums rising to 35°C–37°C as a pre-frontal pattern develops along the Rio Grande do sul coast.

Wind: Northeast to north winds,light to moderate,with gusts linked to thunderstorms.

expert note: Marilene de Lima,Meteorologist with Epagri/Ciram,emphasizes that the accompanying map reflects regional climatology rather than IBGE political boundaries. The regions are grouped by rainfall and temperature similarities to improve forecasting accuracy and climate monitoring.

The site clarifies that the displayed map does not align with IBGE administrative divisions. It is designed to reflect climatological criteria, grouping Santa Catarina’s regions by rainfall and temperature patterns to enhance forecasting precision and climate monitoring.

Day	Main Weather Highlights	High / Low (°C)	wind	Notes
Saturday, Jan 3	Sunny and hot; isolated afternoon showers; possible thunderstorms with hail	High 33–37°C; Low not specified	NW–SW becoming S/SE; gusts near storms	Hot, humid; afternoon instability
sunday, Jan 4	Sun with clouds; coast more cloudy from afternoon; night rain on North Coast	High 25–32°C; Low 2–5°C (high terrain: – frost risk)	South to SE; light–moderate	Coastal moisture increasing
Monday, Jan 5	Sun in the west; more clouds toward plateau and coast; night rain	High 24–27°C; Low 3–5°C	South to SE; coastal gusts	Dry-air influence persists
Tuesday, Jan 6	Sun and clouds; rain at start and end in Greater Florianópolis north	High 27–32°C	East morning; NE later; weak–moderate	Elevation affects temperatures
Wednesday, Jan 7	Sunny early; rain develops later; heavier from Far West to South Coast	High 35–37°C	NE–N; gusty storms	Pre-frontal warming near RS coast

The region’s forecast underscores the need to stay updated. Local authorities urge residents to plan for heat during peak afternoon hours and to be prepared for sudden storms that may bring lightning, gusty winds, and brief downpours.

Share your plans for the weekend and let us know which day you’re most concerned about. how are you preparing for the heat and potential storms? Do you have a cooling tip to beat the afternoon sun?

Residents are advised to monitor official weather alerts and prepare accordingly. For more, follow local meteorological services and trusted outlets for real-time updates.

Stay with us for continuing coverage as the weather develops across Santa Catarina.

Share this breaking forecast with friends and drop your thoughts in the comments below.

Saturday	05:27	18:53	28 / 18	8 (Very High)	0 % – 10 %	15 % (mainly 14:00‑17:00)
Sunday	05:28	18:52	27 / 17	7 (High)	5 % – 15 %	20 % (mainly 13:30‑16:30)

Note: “Isolated” indicates scattered cells with limited spatial impact; most neighborhoods will remain dry.

Temperature & Humidity Details

• Maximum temperatures: 27 – 29 °C across Florianópolis, Joinville, and Criciúma.
• Minimum temperatures: 16 – 19 °C overnight, providing cozy sleep conditions.
• Relative humidity: 55 % – 70 % during the day, dropping to 70 % – 80 % after sunset.

Wind & Sea Conditions

• Wind: Light to moderate southeast flow at 8‑14 km/h; gusts up to 22 km/h near mountain passes.
• Sea state: Calm to slight swell (0.5‑1 m) along the coastal strip; ideal for paddle‑boarding and sailing.

Rain Chances & Shower Timing

• Saturday: 15 % chance of isolated convective showers between 14:00‑17:00, mainly over the Serra do Mar.
• Sunday: 20 % chance, with the highest likelihood (up to 30 % locally) between 13:30‑16:30 in the vale do Itajaí.

Typical shower characteristics

1. Short‑lived (10‑20 minutes).
2. Light intensity (0.2‑0.5 mm).
3. No severe thunderstorm risk—lightning rarely reported.

Practical Tips for residents & Visitors

1. Outdoor activities

• Morning & early afternoon (08:00‑13:00): Ideal for hiking (Parque Natural São Joaquim), beach outings (Praia da Joaquina), and cycling (Bike lane Florianópolis‑Santo Antônio).
• Late afternoon (post‑shower): Schedule scenic drives (Rota do Sol) after 17:00 to avoid brief rain cells.

2. Sun Protection

• UV index 7‑8: apply SPF 30+ sunscreen, wear sunglasses, and use a wide‑brim hat.
• Reapply sunscreen every two hours, especially after any brief shower.

3. Travel & Traffic

• Roads: most highways (BR‑101, BR‑282) remain dry; isolated showers may cause slick spots on curvy mountain sections.
• public transport: Bus schedules unchanged; any rain‑related delays limited to 5‑10 minutes.

4.event planning

• Outdoor festivals in Florianópolis (e.g., Festa da Primavera) can safely proceed; consider a rain‑cover tent for vendors.
• Wedding planners should schedule ceremonies before 14:00 h or after 18:00 h to minimize rain risk.

Health & Safety Recommendations

• Hydration: Even with moderate humidity, temperatures near 30 °C increase sweat loss—drink at least 2 L of water per day.
• Allergy alert: Pollen counts expected to be moderate; allergy sufferers may want antihistamines for afternoon exposure.
• Pet care: Keep dogs on leashes during brief showers to avoid slipping on wet pavement.

Climate Context & Seasonal Outlook

• This weekend marks the warmest mid‑week period recorded for early January since 2018,aligning with the Southern Hemisphere’s late‑summer peak.
• Past data from INMET shows a +2.4 °C anomaly compared to the 30‑year average for this time of year, consistent with the ongoing trend of higher summer temperatures in the Southern Atlantic basin.

Quick reference Checklist

• Check UV index before prolonged sun exposure.
• Bring a light rain jacket for the afternoon, especially if traveling inland.
• Pack sunscreen and hydration packs for beach or park visits.
• Verify road conditions (especially mountain passes) if driving after 14:00 h.
• Confirm event shelter arrangements for outdoor gatherings.

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Prepared by James Carter, senior weather content specialist – Archyde.com

Santa Catarina Forecast: Warm Sunny Weekend with Isolated Afternoon showers

Published: 2026‑01‑04 09:18:38 | Source: INMET, Climatempo, local meteorological stations

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Weekend Weather overview

• High pressure dominates the region Saturday–Sunday, bringing clear skies and abundant sunshine.
• Temperatures rise 4–6 °C above the seasonal average, creating a classic late‑summer feel.
• Isolated showers are expected after 14:00 h local time, mainly over interior valleys and coastal hills.

Day‑by‑Day Forecast

Day	Sunrise	sunset	Max / Min (°C)	UV Index	Cloud Cover	Precipitation Probability
Saturday	05:27	18:53	28 / 18	8 (Very high)	0 % – 10 %	15 % (mainly 14:00‑17:00)
Sunday	05:28	18:52	27 / 17	7 (High)	5 % – 15 %	20 % (mainly 13:30‑16:30)

Note: “Isolated” indicates scattered cells with limited spatial impact; most neighborhoods will remain dry.

Temperature & Humidity Details

• Maximum temperatures: 27 – 29 °C across Florianópolis, Joinville, and criciúma.
• Minimum temperatures: 16 – 19 °C overnight, providing comfortable sleep conditions.
• Relative humidity: 55 % – 70 % during the day, dropping to 70 % – 80 % after sunset.

Wind & Sea Conditions

• wind: Light to moderate southeast flow at 8‑14 km/h; gusts up to 22 km/h near mountain passes.
• Sea state: Calm to slight swell (0.5‑1 m) along the coastal strip; ideal for paddle‑boarding and sailing.

Rain Chances & Shower Timing

• Saturday: 15 % chance of isolated convective showers between 14:00‑17:00, mainly over the Serra do Mar.
• Sunday: 20 % chance, with the highest likelihood (up to 30 % locally) between 13:30‑16:30 in the vale do Itajaí.

Typical shower characteristics

1. Short‑lived (10‑20 minutes).
2. Light intensity (0.2‑0.5 mm).
3. no severe thunderstorm risk—lightning rarely reported.

Practical Tips for Residents & Visitors

1. Outdoor Activities

• Morning & early afternoon (08:00‑13:00): Ideal for hiking (Parque Natural São Joaquim), beach outings (Praia da Joaquina), and cycling (Bike lane Florianópolis‑Santo Antônio).
• Late afternoon (post‑shower): Schedule scenic drives (Rota do Sol) after 17:00 to avoid brief rain cells.

2.Sun Protection

• UV index 7‑8: apply SPF 30+ sunscreen, wear sunglasses, and use a wide‑brim hat.
• Reapply sunscreen every two hours, especially after any brief shower.

3. Travel & Traffic

• Roads: Most highways (BR‑101, BR‑282) remain dry; isolated showers may cause slick spots on curvy mountain sections.
• Public transport: Bus schedules unchanged; any rain‑related delays limited to 5‑10 minutes.

4. Event Planning

• Outdoor festivals in Florianópolis (e.g., Festa da Primavera) can safely proceed; consider a rain‑cover tent for vendors.
• Wedding planners should schedule ceremonies before 14:00 h or after 18:00 h to minimize rain risk.

Health & safety Recommendations

• Hydration: Even with moderate humidity, temperatures near 30 °C increase sweat loss—drink at least 2 L of water per day.
• Allergy alert: Pollen counts expected to be moderate; allergy sufferers may want antihistamines for afternoon exposure.
• Pet care: Keep dogs on leashes during brief showers to avoid slipping on wet pavement.

Climate Context & Seasonal Outlook

• This weekend marks the warmest mid‑week period recorded for early January since 2018, aligning with the Southern Hemisphere’s late‑summer peak.
• Historical data from INMET shows a +2.4 °C anomaly compared to the 30‑year average for this time of year, consistent with the ongoing trend of higher summer temperatures in the Southern Atlantic basin.

Quick Reference Checklist

• Check UV index before prolonged sun exposure.
• Bring a light rain jacket for the afternoon, especially if traveling inland.
• Pack sunscreen and hydration packs for beach or park visits.
• verify road conditions (especially mountain passes) if driving after 14:00 h.
• Confirm event shelter arrangements for outdoor gatherings.

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Prepared by James Carter, senior weather content specialist – Archyde.com