Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 8.1 °C | 8.3 °C | 18 days | Unfavourable season |
| February | 8.3 °C | 8.3 °C | 15 days | Unfavourable season |
| March | 11 °C | 8.4 °C | 15 days | Unfavourable season |
| April | 13.8 °C | 9.1 °C | 14 days | Possible, with trade-offs |
| May | 17.9 °C | 10 °C | 10 days | Possible, with trade-offs |
| June | 21.1 °C | 10.6 °C | 8 days | Pleasant — a good time to go |
| July | 24.6 °C | 11.2 °C | 4 days | Ideal — one of the best times of year |
| August | 24.8 °C | 11.7 °C | 5 days | Ideal — one of the best times of year |
| September | 20.5 °C | 11.3 °C | 10 days | Pleasant — a good time to go |
| October | 15.1 °C | 10.3 °C | 14 days | Possible, with trade-offs |
| November | 10.3 °C | 9.7 °C | 18 days | Unfavourable season |
| December | 7.4 °C | 8.8 °C | 19 days | Unfavourable season |
Nearby in March
Before you go
Three things to check once you have picked your dates.
Entry
No visa, but an electronic travel authorisation (ESTA) must be obtained online before departure. Passport valid until your return date. Apply for ESTA on the official website or app; not available if you visited Cuba since 2021 or Iran, Iraq, Libya, North Korea, Somalia, Sudan, Syria or Yemen.
For a British passport, per the UK Foreign Office on 18 August 2026. Rules change: check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 18 August 2026
Health
Vaccines · Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. No entry requirement.
Malaria · None.
Per the CDC (page reviewed 26 June 2024); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Seattle in March?
The sea averages 8.4°C in March — too cold for most swimmers.
How hot is Seattle in March?
Expect 11°C in the afternoon and 3.7°C at night, averaged over the last 10 years.
Does it rain a lot in Seattle in March?
Around 15 days with rain (≥ 1 mm) in the month — 48% of days.